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Engine model

Lycoming O-540

Lycoming Engines

Airworthiness Directives
19
Manufacturer bulletins
22390 Service Bulletins, 133 Service Instructions
Last live check
2026-10-0319 of 19 re-checked, oldest 2026-10-02

Printed from https://aircraftdirectives.com/engine/lycoming-o-540 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

This page is a reference Record, not an airworthiness or compliance determination. Official FAA and manufacturer sources control over our restatement, subject to governing law. Check applicability, current requirements and incorporated documents before acting. The owner or operator remains responsible for airworthiness and required records under 14 CFR 91.403 and 91.417, as applicable. Terms of Use: /terms.

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Also known as: IO-540, TIO-540

Save this engine

What directives and bulletins apply to the Lycoming O-540

The FAA has published 20 Airworthiness Directives that name the Lycoming O-540 (Lycoming Engines), the earliest in 1995 and the newest on 2026-08-28. The index also holds 1 correction notice for an earlier directive. 1 has been withdrawn. 223 manufacturer bulletins from Lycoming Engines name this engine too.

Newest

  1. AD 2026-17-10 Airworthiness Directives; Lycoming Engines 2026-08-28
  2. AD 2022-16-03 Airworthiness Directives; Continental Aerospace Technologies, Inc., Lycoming Engines, and ... 2022-07-29
  3. AD 2017-11-10 Airworthiness Directives; Lycoming Engines Reciprocating Engines 2017-06-13

See all 20 directives

The ones owners meet again

  1. AD 2017-11-10 Airworthiness Directives; Lycoming Engines Reciprocating Engines 2017-06-13 Repetitive inspection or action
  2. AD 97-01-04 Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. 1997-04-07 Repetitive inspection or action

We index directives by model, not by serial number or N-number; the record page and the official document say which serials apply.

Bulletins that matter

  1. SI SI 1485 Exhaust Valve and Guide Identification Procedure Open the bulletin
  2. SI SL L234 Tool Rental Program Open the bulletin
  3. SI SI 1154 FAA-Approved Starters and Alternators Open the bulletin
  4. SB SB 533 Recommended Action for Sudden Engine Stoppage, Propeller/Rotor Strike or Loss of Propeller... Open the bulletin
  5. SI SI 1575 New Connecting Rod Bushing Open the bulletin

How to use this page: check the newest directives at every annual, keep the repetitive items on your inspection calendar, and open the official Federal Register text before any work - our summaries are a reading aid, not a determination of compliance.

Airworthiness Directives

19 records · 1 correction attached
ADAD 2026-17-10Lycoming Engines2026-09-14Active
AD

2026-17-10

FR doc 2026-17584 · 91 FR 55451

AD 2026-17-10Published 2026-08-28Effective 2026-09-14

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Lycoming Engines

Requires replacement of the affected piston pin with a part eligible for installation and, for certain engines, oil change and visual inspection of the engine oil filter, oil pressure screen, and oil suction screen for metal particulates.

Full official abstract

Airworthiness Directives; Lycoming Engines

The FAA is adopting a new airworthiness directive (AD) for certain Lycoming Engines (Lycoming) Model O-235, O-540, and IO-540 engines with a certain piston pin installed. This AD was prompted by several reports of piston pin failure that resulted in metal particulate contamination in the engine oil and engine failure. This AD requires replacement of the affected piston pin with a part eligible for installation and, for certain engines, oil change and visual inspection of the engine oil filter, oil pressure screen, and oil suction screen for metal particulates. This AD also prohibits the installation of an affected piston pin on any engine. The FAA is issuing this AD to address the unsafe condition on these products.

Source: Federal Register document 2026-17584, retrieved 2026-09-01 · checked against the live Federal Register record on 2026-10-03

View on Federal Register (opens in a new tab) Search DRS manually for AD 2026-17-10 (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2022-16-03Continental Aerospace Technologies, Inc., Lycoming Engines, and Textron Lycoming/Subsidiary of Textron, Inc. Reciprocating Engines2022-08-15Active
AD

2022-16-03

FR doc 2022-16371 · 87 FR 45633

AD 2022-16-03Published 2022-07-29Effective 2022-08-15

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Continental Aerospace Technologies, Inc., Lycoming Engines, and Textron Lycoming/Subsidiary of Textron, Inc. Reciprocating Engines

Requires the replacement of affected magneto or inspection of affected magneto and, if no white grease is detected, replacement of magneto components, as applicable, and reassembly of the magneto.

Full official abstract

Airworthiness Directives; Continental Aerospace Technologies, Inc., Lycoming Engines, and Textron Lycoming/Subsidiary of Textron, Inc. Reciprocating Engines

The FAA is adopting a new airworthiness directive (AD) for certain Continental Aerospace Technologies, Inc. GTSIO-520, IO-346, IO- 470, IO-520, IO-550, LTSIO-520, O-470, TSIO-520, and TSIOL-550 series model reciprocating engines, Lycoming Engines AEIO-320, AEIO-360, AEIO- 540, AIO-320, AIO-360, GO-480, GSO-480, HIO-360, HIO-540, IGO-480, IGO- 540, IGSO-480, IGSO-540, IO-320, IO-360, IO-540, LIO-360, LTIO-540, O- 235, O-320, O-360, O-540, TIGO-541, TIO-360, TIO-540, TIO-541, TVO-435, VO-435, and VO-540 series model reciprocating engines, and Textron Lycoming/Subsidiary of Textron, Inc. IO-720 series model reciprocating engines. This AD was prompted by a report of a manufacturing quality escape of improperly lubricated roller bearings installed in certain magnetos, which may result in overheating and magneto seizure. This AD requires the replacement of affected magneto or inspection of affected magneto and, if no white grease is detected, replacement of magneto components, as applicable, and reassembly of the magneto. The FAA is issuing this AD to address the unsafe condition on these products.

Source: Federal Register document 2022-16371, retrieved 2026-08-14 · checked against the live Federal Register record on 2026-10-02

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2017-11-10Lycoming Engines Reciprocating Engines2017-06-28Active
AD

2017-11-10

FR doc 2017-12075 · 82 FR 26982

AD 2017-11-10Published 2017-06-13Effective 2017-06-28

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Lycoming Engines Reciprocating Engines

Requires initial and repetitive inspections of engine exhaust system weld joints and torque checking the exhaust pipe flange mounting nuts.

Full official abstract

Airworthiness Directives; Lycoming Engines Reciprocating Engines

We are adopting a new airworthiness directive (AD) for all Lycoming TIO-540-AJ1A reciprocating engines. This AD requires initial and repetitive inspections of engine exhaust system weld joints and torque checking the exhaust pipe flange mounting nuts. This AD was prompted by several reports of engine exhaust leaks. We are issuing this AD to correct the unsafe condition on these products.

Source: Federal Register document 2017-12075, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-03

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2015-10-06Lycoming Engines Reciprocating Engines (Type Certificate Previously Held by Textron Lycoming Division, AVCO Corporation)2015-07-02Active
AD

2015-10-06

FR doc 2015-12651 · 80 FR 30345

AD 2015-10-06Published 2015-05-28Effective 2015-07-02

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Lycoming Engines Reciprocating Engines (Type Certificate Previously Held by Textron Lycoming Division, AVCO Corporation)

Requires inspection of the engine exhaust pipes for cracks and replacement of the turbocharger mounting bracket.

Full official abstract

Airworthiness Directives; Lycoming Engines Reciprocating Engines (Type Certificate Previously Held by Textron Lycoming Division, AVCO Corporation)

We are adopting a new airworthiness directive (AD) for certain Lycoming TIO-540-AJ1A reciprocating engines. This AD was prompted by several reports of cracked engine exhaust pipes. This AD requires inspection of the engine exhaust pipes for cracks and replacement of the turbocharger mounting bracket. We are issuing this AD to prevent failure of the exhaust system due to cracking, which could lead to uncontrolled engine fire, harmful exhaust gases entering the cabin resulting in crew incapacitation, and damage to the airplane.

Source: Federal Register document 2015-12651, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-03

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2013-22-23 R1AERMACCHI S.p.A. Airplanes2014-07-11Active
AD

2013-22-23 R1

FR doc 2014-15528 · 79 FR 39959

AD 2013-22-23 R1Published 2014-07-11Effective 2014-07-11

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

AERMACCHI S.p.A. Airplanes

Rescinds AD 2013-22-23.

Full official abstract

Airworthiness Directives; AERMACCHI S.p.A. Airplanes

We are rescinding Airworthiness Directive (AD) 2013-22-23 for AERMACCHI S.p.A. Models F.260, F.260B, F.260C, F.260D, F.260E, F.260F, S.208, and S.208A airplanes equipped with a Lycoming O-540, IO-540, or AEIO-540 (depending on the airplane model) wide cylinder flange engine with a front crankcase mounted propeller governor. AD 2013-22-23 resulted from mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. We issued the AD to detect and correct improper position of the set screw, which could lead to complete loss of engine oil pressure and result in emergency landing. Since we issued AD 2013-22-23, we have determined the unsafe condition does not exist specific to the airplane design features.

Source: Federal Register document 2014-15528, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-03

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2013-22-23Aermacchi S.p.A. Airplanes2013-12-16Active
AD

2013-22-23

FR doc 2013-26681 · 78 FR 68357

AD 2013-22-23Published 2013-11-14Effective 2013-12-16

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Aermacchi S.p.A. Airplanes

Requires actions to address the unsafe condition on these products.

Full official abstract

Airworthiness Directives; Aermacchi S.p.A. Airplanes

We are adopting a new airworthiness directive (AD) for Aermacchi S.p.A. Models F.260, F.260B, F.260C, F.260D, F.260E, F.260F, S.208, and S.208A airplanes equipped with a Lycoming O-540 wide cylinder flange engine with a front crankcase mounted propeller governor. This AD results from mandatory continuing airworthiness information (MCAI) issued by the aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI describes the unsafe condition as the set screw that fixes the setting of the propeller governor idler gear shaft was not in the proper position. We are issuing this AD to require actions to address the unsafe condition on these products.

Source: Federal Register document 2013-26681, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-03

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2013-21-02Lycoming Engines and Continental Motors, Inc. Reciprocating Engines2013-11-13Active
AD

2013-21-02

FR doc 2013-25342 · 78 FR 64394

AD 2013-21-02Published 2013-10-29Effective 2013-11-13

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Lycoming Engines and Continental Motors, Inc. Reciprocating Engines

Requires removing certain HET turbochargers from service before further flight.

Full official abstract

Airworthiness Directives; Lycoming Engines and Continental Motors, Inc. Reciprocating Engines

We are superseding airworthiness directive (AD) 2012-24-09 for Lycoming Engines TIO-540-AK1A, and Continental Motors, Inc. (CMI) TSIO- 360-MB, TSIO-360-SB, and TSIO-360-RB reciprocating engines, with certain Hartzell Engine Technologies (HET) turbochargers, model TA0411, installed. AD 2012-24-09 required removing certain HET turbochargers from service before further flight. This AD also requires removing certain HET turbochargers from service before further flight. This AD was prompted by a report that an additional engine, the CMI LTSIO-360- RB, has the affected HET turbochargers installed. We are issuing this AD to prevent turbocharger turbine wheel failure, reduction or complete loss of engine power, loss of engine oil, oil fire, and damage to the airplane.

Source: Federal Register document 2013-25342, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-03

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2012-19-01Lycoming Engines Reciprocating Engines2012-10-24Active
AD

2012-19-01

FR doc 2012-22924 · 77 FR 58003

AD 2012-19-01Published 2012-09-19Effective 2012-10-24

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Lycoming Engines Reciprocating Engines

Requires replacing certain crankshafts in the affected engines.

Full official abstract

Airworthiness Directives; Lycoming Engines Reciprocating Engines

We are superseding an existing airworthiness directive (AD) for certain Lycoming Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO- 540, AEIO-540, (L)TIO-540, IO-580, and IO-720 series reciprocating engines. That AD currently requires replacing certain crankshafts in the affected engines. This AD continues to require replacing certain crankshafts, corrects the start date of affected engine models in Lycoming Mandatory Service Bulletin (MSB) No. 569A to the start date in Supplement No. 1 to Lycoming MSB No. 569A, dated May 27, 2009, and includes additional (formerly experimental) IO-390, AEIO-390, and AEIO- 580 series engine models having affected crankshafts. This AD was prompted by Lycoming Engines discovering that the start date of affected engine models in MSB No. 569A is incorrect and the need to include additional engine models having the affected crankshafts. We are issuing this AD to prevent failure of the crankshaft, which will result in total engine power loss, in-flight engine failure, and possible loss of the aircraft.

Source: Federal Register document 2012-22924, retrieved 2026-08-14 · checked against the live Federal Register record on 2026-10-02

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2006-20-09Lycoming Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO-540, AEIO-540, (L)TIO-540, IO-580, and IO-720 Series Reciprocating Engines.2006-11-03Active
AD

2006-20-09

FR doc E6-15958 · 71 FR 57407

AD 2006-20-09Published 2006-09-29Effective 2006-11-03

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Lycoming Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO-540, AEIO-540, (L)TIO-540, IO-580, and IO-720 Series Reciprocating Engines.

Requires replacing certain crankshafts.

Full official abstract

Airworthiness Directives; Lycoming Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO-540, AEIO-540, (L)TIO-540, IO-580, and IO-720 Series Reciprocating Engines.

The FAA is adopting a new airworthiness directive (AD) for certain Lycoming Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO-540, AEIO-540, (L)TIO-540, IO-580, and IO-720 series reciprocating engines. This AD requires replacing certain crankshafts. This AD results from reports of 23 confirmed failures of similar crankshafts in Lycoming Engines 360 and 540 series reciprocating engines. We are issuing this AD to prevent failure of the crankshaft, which will result in total engine power loss, in-flight engine failure, and possible loss of the aircraft.

Source: Federal Register document E6-15958, retrieved 2026-08-14 · checked against the live Federal Register record on 2026-10-02

View on Federal Register (opens in a new tab) Search DRS manually for AD 2006-20-09 (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2005-19-11Lycoming Engines (Formerly Textron Lycoming) AEIO-360, IO-360, O-360, LIO-360, LO-360, AEIO-540, IO-540, O-540, and TIO-540 Series Reciprocating Engines2005-10-21Active
AD

2005-19-11

FR doc 05-18323 · 70 FR 54618

AD 2005-19-11Published 2005-09-16Effective 2005-10-21

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Lycoming Engines (Formerly Textron Lycoming) AEIO-360, IO-360, O-360, LIO-360, LO-360, AEIO-540, IO-540, O-540, and TIO-540 Series Reciprocating Engines

Requires replacing certain crankshafts.

Full official abstract

Airworthiness Directives; Lycoming Engines (Formerly Textron Lycoming) AEIO-360, IO-360, O-360, LIO-360, LO-360, AEIO-540, IO-540, O-540, and TIO-540 Series Reciprocating Engines

The FAA is adopting a new airworthiness directive (AD) for certain Lycoming Engines (formerly Textron Lycoming) AEIO-360, IO-360, O-360, LIO-360, LO-360, AEIO-540, IO-540, O-540, and TIO-540 series reciprocating engines rated at 300 horsepower (HP) or lower. This AD requires replacing certain crankshafts. This AD results from reports of 12 crankshaft failures in Lycoming 360 and 540 series engines rated at 300 HP or lower. We are issuing this AD to prevent failure of the crankshaft, which could result in total engine power loss, in-flight engine failure, and possible loss of the aircraft.

Source: Federal Register document 05-18323, retrieved 2026-08-14 · checked against the live Federal Register record on 2026-10-02

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2004-05-24Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating Engines2004-03-30Active
AD

2004-05-24

FR doc 04-5262 · 69 FR 12057

AD 2004-05-24Published 2004-03-15Effective 2004-03-30

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating Engines

Requires replacing certain zinc-plated crankshaft gear retaining bolts.

Full official abstract

Airworthiness Directives; Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating Engines

The FAA is superseding an existing airworthiness directive (AD) for Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 series reciprocating engines. That action requires replacing certain zinc-plated crankshaft gear retaining bolts. This action retains that requirement, but expands the population of affected engines. In addition, this AD adds five additional kits for replacing the crankshaft gear retaining bolts. This AD results from notification from the Manufacturer of 161 engines not identified in the previous AD. This AD also results from approval of the five additional kits as alternative methods of compliance with AD 2002-23-06. We are issuing this AD to prevent loss of all engine power and possible forced landing.

Source: Federal Register document 04-5262, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-02

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2002-23-06Textron Lycoming AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating Engines2002-11-19Active
AD

2002-23-06

FR doc 02-29003 · 67 FR 68932

AD 2002-23-06Published 2002-11-14Effective 2002-11-19

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Textron Lycoming AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating Engines

Requires replacing certain zinc-plated crankshaft gear retaining bolts.

Full official abstract

Airworthiness Directives; Textron Lycoming AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating Engines

This amendment supersedes an emergency airworthiness directive (AD) that was sent previously to all known U.S. owners and operators of Textron Lycoming (T/L) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 series reciprocating engines. That action requires replacing certain zinc-plated crankshaft gear retaining bolts. This action still requires replacing certain zinc-plated crankshaft gear retaining bolts, but expands the population of affected engines. This amendment is prompted by two recent failures of zinc-plated crankshaft gear retaining bolts, and a reassessment of the extent to which the suspect bolts may still be present in the field. The actions specified by this AD are intended to prevent loss of all engine power and possible forced landing.

Source: Federal Register document 02-29003, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-02

View on Federal Register (opens in a new tab) Search DRS manually for AD 2002-23-06 (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 2002-19-03Textron Lycoming IO-540, LTIO-540 and TIO-540 Series Reciprocating Engines2002-09-20Active
AD

2002-19-03

FR doc 02-24030 · 67 FR 59139

AD 2002-19-03Published 2002-09-20Effective 2002-09-20

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Textron Lycoming IO-540, LTIO-540 and TIO-540 Series Reciprocating Engines

Prompted by reports of crankshaft failures in LTIO-540 and TIO-540 engines, rated at 300 HP or higher.

Full official abstract

Airworthiness Directives; Textron Lycoming IO-540, LTIO-540 and TIO-540 Series Reciprocating Engines

This amendment supersedes emergency airworthiness directive (AD) 2002-17-53 that was sent previously to all known U.S. owners and operators of Textron Lycoming LTIO-540 and TIO-540 series engines, rated at 300 horsepower (HP) or higher. That action requires, before further flight, replacing certain serial-numbered crankshafts that were hammer forged with crankshafts that were press forged. That AD was prompted by reports of crankshaft failures in LTIO-540 and TIO-540 engines, rated at 300 HP or higher. This amendment expands the suspect population of engines to include engines with crankshafts that were manufactured between March 1997 and the present and all IO-540 engines with crankshafts that were manufactured between March 1997 and the present that have been modified by supplemental type certificate (STC) by installing a turbocharger system. The actions specified by this AD are intended to prevent failure of the crankshaft, which could result in total engine power loss, in-flight engine failure and possible forced landing.

Source: Federal Register document 02-24030, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-02

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ADAD 99-04-04Textron Lycoming Reciprocating Engines IO-540 and O-540 Engines Equipped With Slick Aircraft Products Magnetos1999-02-25Active
AD

99-04-04

FR doc 99-3039 · 64 FR 6516

AD 99-04-04Published 1999-02-10Effective 1999-02-25

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Textron Lycoming Reciprocating Engines IO-540 and O-540 Engines Equipped With Slick Aircraft Products Magnetos

Requires removal of the Slick magneto from the engine and inspection of the impulse coupling pawl for wear.

Full official abstract

Airworthiness Directives; Textron Lycoming Reciprocating Engines IO-540 and O-540 Engines Equipped With Slick Aircraft Products Magnetos

This amendment adopts a new airworthiness directive (AD) that is applicable to Textron Lycoming IO-540 and O-540 engines equipped with Slick Aircraft Products magnetos. This action requires removal of the Slick magneto from the engine and inspection of the impulse coupling pawl for wear. This amendment is prompted by several service difficulty reports, two incidents, and an accident involving severely worn and failed impulse couplings. The actions specified in this AD are intended to prevent failure of the magneto impulse coupling, resulting in seizure of the engine.

Source: Federal Register document 99-3039, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-02

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ADAD 99-03-05Textron Lycoming Model O-540-F1B5 Reciprocating Engines1999-02-18Active
AD

99-03-05

FR doc 99-2474 · 64 FR 5149

AD 99-03-05Published 1999-02-03Effective 1999-02-18

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Textron Lycoming Model O-540-F1B5 Reciprocating Engines

Requires the removal and replacement of the crankshaft gear retaining bolts.

Full official abstract

Airworthiness Directives; Textron Lycoming Model O-540-F1B5 Reciprocating Engines

This amendment adopts a new airworthiness directive (AD) that is applicable to Textron Lycoming Model O-540-F1B5 reciprocating engines. This action requires the removal and replacement of the crankshaft gear retaining bolts. This amendment is prompted by 2 reported failures of the crankshaft gear retaining bolts. The actions specified in this AD are intended to prevent failure of the crankshaft gear retaining bolts, which can result in engine failure and subsequent autorotation and forced landing.

Source: Federal Register document 99-2474, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-03

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 97-01-04Textron Lycoming and Superior Air Parts, Inc.1997-04-22Active
AD

97-01-04

FR doc 97-8476 · 62 FR 16477

AD 97-01-04Published 1997-04-07Effective 1997-04-22

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Textron Lycoming and Superior Air Parts, Inc.

Requires removal from service of affected cylinder assemblies for higher time cylinder assemblies and replacement with serviceable parts, and initial and repetitive dye penetrant inspections for mid-time cylinder assemblies, or…

Full official abstract

Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc.

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 97-01-04 that was sent previously to all known U.S. owners and operators of certain Textron Lycoming TIO- 540, LTIO-540, and IO-540 series reciprocating engines with certain Superior Air Parts, Inc. Parts Manufacture Approval (PMA) replacement cylinder assemblies installed by individual letters. This AD requires removal from service of affected cylinder assemblies for higher time cylinder assemblies and replacement with serviceable parts, and initial and repetitive dye penetrant inspections for mid-time cylinder assemblies, or replacement with serviceable parts. This amendment is prompted by a report of an inflight engine failure of a Textron Lycoming TIO-540 reciprocating engine with affected Superior Air Parts, Inc. PMA cylinder assemblies installed. The actions specified by this AD are intended to prevent cylinder head separation, inflight loss of power, possible engine failure, and fire.

Source: Federal Register document 97-8476, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-02

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 96-23-03Textron Lycoming Reciprocating Engines1996-12-17Active
AD

96-23-03

FR doc 96-30095 · 61 FR 63704

AD 96-23-03Published 1996-12-02Effective 1996-12-17

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Textron Lycoming Reciprocating Engines

Requires a maintenance records check to determine if suspect high pressure fuel pumps are installed, and inspection to determine if the high pressure fuel pump has one of the suspect date codes.

Full official abstract

Airworthiness Directives; Textron Lycoming Reciprocating Engines

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 96-23-03 that was sent previously to all known U.S. owners and operators of Textron Lycoming IO-320, LIO- 320, AEIO-320, IO- 360, LIO-360, AEIO-360, HIO-360, TO-360, IO-540, O- 540-L, LIO-540, and AEIO-540 series reciprocating engines by individual letters. This AD requires a maintenance records check to determine if suspect high pressure fuel pumps are installed, and inspection to determine if the high pressure fuel pump has one of the suspect date codes. If the high pressure fuel pump has a suspect date code, this AD requires disassembly and inspection of the high pressure fuel pump, and, if necessary, removal from service and replacement with a serviceable part. In addition, this AD requires reporting findings of unserviceable high pressure fuel pumps. This amendment is prompted by reports of inflight failures of high pressure fuel pumps. The actions specified by this AD are intended to prevent an inflight engine failure due to fuel starvation, which could result in a forced landing.

Source: Federal Register document 96-30095, retrieved 2026-08-14 · checked against the live Federal Register record on 2026-10-02

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 91-21-01 R1Textron Lycoming Model TIO-540-S1AD Reciprocating Engines1996-06-27Active
AD

91-21-01 R1

FR doc 96-14220 · 61 FR 29003

AD 91-21-01 R1Published 1996-06-07Effective 1996-06-27

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Textron Lycoming Model TIO-540-S1AD Reciprocating Engines

Requires the upgrade of the engine exhaust system to a new design configuration; and also establishes inspection intervals for engines incorporating the new design configuration, for engines incorporating the design configuration…

1 correction to this AD FAA · 1996-09-06

Correction published 1996-09-06

Issued by
Federal Aviation Administration
Published
1996-09-06
Document
Federal Register 96-22773 · Final rule; correction
Corrects
the version published June 7, 1996 at 61 FR 29003

This document makes a correction to Airworthiness Directive (AD) 91-21-01 R1 applicable to Textron Lycoming Model TIO-540-S1AD reciprocating engines that was published in the Federal Register on June 7, 1996 (61 FR 29003). The reference to the New York Aircraft Certification Office in Note 3 following the paragraph describing the procedure for obtaining an alternative method of compliance was omitted. This document corrects that omission. In all other respects, the original document remains the same.

A correction restates part of an AD that was published incorrectly. It is not an additional requirement and it does not change the AD number or its effective date.

Source: Federal Register document 96-22773, retrieved 2026-08-15

Read this correction on Federal Register (opens in a new tab)
Full official abstract

Airworthiness Directives; Textron Lycoming Model TIO-540-S1AD Reciprocating Engines

This amendment revises an existing airworthiness directive (AD), applicable to Textron Lycoming Model TIO-540-S1AD reciprocating engines, that currently requires the upgrade of the engine exhaust system to a new design configuration; and also establishes inspection intervals for engines incorporating the new design configuration, for engines incorporating the design configuration required by a previous AD, and for engines not yet incorporating either design configuration. This amendment clarifies that an exhaust system disassembly is not necessary when inspecting the exhaust system after the installation of the new design One-piece Exhaust Riser Kit, and Manifold Retaining Kit. This amendment is prompted by reports from operators requesting clarification of two paragraphs in the compliance section. The actions specified by this AD are intended to prevent cracking or distortion of engine exhaust system flanges, V-band coupling, and pipes, which could result in engine compartment fire and smoke entering the cabin with possible loss to the aircraft.

Source: Federal Register document 96-14220, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-02

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 95-07-01Textron Lycoming O-360, LO-360, HO-360, HIO-360, TIO-360, LIO-360, AEIO-360, O-540, IO-540, TIO-540, LTIO-540, IVO-540, AEIO-540, TIO-541, and IO-720 Series Reciprocating Engines1995-04-12Active
AD

95-07-01

FR doc 95-7683 · 60 FR 15864

AD 95-07-01Published 1995-03-28Effective 1995-04-12

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Textron Lycoming O-360, LO-360, HO-360, HIO-360, TIO-360, LIO-360, AEIO-360, O-540, IO-540, TIO-540, LTIO-540, IVO-540, AEIO-540, TIO-541, and IO-720 Series Reciprocating Engines

Requires removal prior to further flight of suspect unapproved connecting rod bolts and replacement with serviceable connecting rod bolts.

Full official abstract

Airworthiness Directives; Textron Lycoming O-360, LO-360, HO-360, HIO-360, TIO-360, LIO-360, AEIO-360, O-540, IO-540, TIO-540, LTIO-540, IVO-540, AEIO-540, TIO-541, and IO-720 Series Reciprocating Engines

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 95-07-01 that was sent previously to all known U.S. owners and operators of Textron Lycoming O-360, LO- 360, HO-360, HIO-360, TIO-360, LIO-360, AEIO-360, O-540, IO-540, TIO- 540, LTIO-540, IVO-540, AEIO-540, TIO-541, and IO-720 series reciprocating engines by individual letters. This AD requires removal prior to further flight of suspect unapproved connecting rod bolts and replacement with serviceable connecting rod bolts. This amendment is prompted by reports of connecting rod bolt failures. The actions specified by this AD are intended to prevent engine failure due to connecting rod bolt failure, which could result in damage to or loss of the aircraft.

Source: Federal Register document 95-7683, retrieved 2026-08-14 · checked against the live Federal Register record on 2026-10-02

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Withdrawn by the FAA

1 record

The FAA has withdrawn this directive — it is no longer in force and is not applicable to this engine. Listed only so the status can be confirmed at the official record.

Service Bulletins

90 records
SBSB 533Recommended Action for Sudden Engine Stoppage, Propeller/Rotor Strike or Loss of Propeller/Rotor Blade or Tip2026-02-10
SB

SB 533

Lycoming Engines

Issued 2026-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Recommended Action for Sudden Engine Stoppage, Propeller/Rotor Strike or Loss of Propeller/Rotor Blade or Tip

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 525SSP-525 Valve Sticking - Early Warning Signs and Indications2025-11-24
SB

SB 525

Lycoming Engines

Issued 2025-11-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

SSP-525 Valve Sticking - Early Warning Signs and Indications

Applies to Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 342Fuel Line (Stainless Steel Tube Assy.) and Support Clamp Inspection and Installation2025-07-29
SB

SB 342

Lycoming Engines

Issued 2025-07-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Fuel Line (Stainless Steel Tube Assy.) and Support Clamp Inspection and Installation

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 240AAMandatory Parts Replacement at Overhaul and During Repair or Maintenance2025-07-08
SB

SB 240AA

Lycoming Engines

Issued 2025-07-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Mandatory Parts Replacement at Overhaul and During Repair or Maintenance

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 630BConnecting Rod Bushing Inspection After Cylinder Removal2025-06-12
SB

SB 630B

Lycoming Engines

Issued 2025-06-12

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Connecting Rod Bushing Inspection After Cylinder Removal

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 656AReplacement of 6-Cylinder Electronic Ignition System (EIS)2025-04-02
SB

SB 656A

Lycoming Engines

Issued 2025-04-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement of 6-Cylinder Electronic Ignition System (EIS)

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 661STD-35 Plain Washer Replacement2025-02-21
SB

SB 661

Lycoming Engines

Issued 2025-02-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

STD-35 Plain Washer Replacement

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 659STD-33 Plain Washer Replacement2025-02-21
SB

SB 659

Lycoming Engines

Issued 2025-02-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

STD-33 Plain Washer Replacement

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 660Reprint of Slick/Champion Aerospace Service Bulletin SB1-24A2024-09-20
SB

SB 660

Lycoming Engines

Issued 2024-09-20

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Slick/Champion Aerospace Service Bulletin SB1-24A

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 655Hartzell Engine Tech (HET) Service Bulletin (SB) No. 2032024-01-04
SB

SB 655

Lycoming Engines

Issued 2024-01-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Hartzell Engine Tech (HET) Service Bulletin (SB) No. 203

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 653Hartzell Engine Tech (HET) Alert Service Bulletin (ASB) No. 0982023-09-13
SB

SB 653

Lycoming Engines

Issued 2023-09-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Hartzell Engine Tech (HET) Alert Service Bulletin (ASB) No. 098

Applies to Lycoming IO-720Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 649INSTALLATION OF CORRECT ELECTRONIC IGNITION SYSTEM (EIS)2023-02-10
SB

SB 649

Lycoming Engines

Issued 2023-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

INSTALLATION OF CORRECT ELECTRONIC IGNITION SYSTEM (EIS)

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 628REPRINT OF HARTZELL ENGINE TECHNOLOGIES’ (HET) ALERT SERVICE BULLETIN (ASB) 0762023-02-10
SB

SB 628

Lycoming Engines

Issued 2023-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

REPRINT OF HARTZELL ENGINE TECHNOLOGIES’ (HET) ALERT SERVICE BULLETIN (ASB) 076

Applies to Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 651INSPECTION FOR ROTATOR CAPS ON INTAKE VALVES2023-02-10
SB

SB 651

Lycoming Engines

Issued 2023-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

INSPECTION FOR ROTATOR CAPS ON INTAKE VALVES

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 647Incorrect Markings on Service Tool# ST-3102021-12-15
SB

SB 647

Lycoming Engines

Issued 2021-12-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Incorrect Markings on Service Tool# ST-310

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 645Small End Connecting Rod Bushing Inspection2021-09-24
SB

SB 645

Lycoming Engines

Issued 2021-09-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Small End Connecting Rod Bushing Inspection

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 643Crankcase Nut Safety Wire Inspection2021-09-16
SB

SB 643

Lycoming Engines

Issued 2021-09-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Crankcase Nut Safety Wire Inspection

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 369ENGINE INSPECTION AFTER OVERSPEED2020-04-08
SB

SB 369

Lycoming Engines

Issued 2020-04-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

ENGINE INSPECTION AFTER OVERSPEED

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 637Reprint of Slick/Champion Aerospace Service Bulletin SB1-192019-03-14
SB

SB 637

Lycoming Engines

Issued 2019-03-14

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Slick/Champion Aerospace Service Bulletin SB1-19

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 634Cylinder and Head Assembly Serviceable Life2018-10-10
SB

SB 634

Lycoming Engines

Issued 2018-10-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Cylinder and Head Assembly Serviceable Life

Applies to Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 301Maintenance Procedures and Service Limitations for Valves2018-08-24
SB

SB 301

Lycoming Engines

Issued 2018-08-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Maintenance Procedures and Service Limitations for Valves

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 627Exhaust System Inspection2018-05-16
SB

SB 627

Lycoming Engines

Issued 2018-05-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Exhaust System Inspection

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 553Crankshaft Inspection for Lycoming Six Cylinder Turbocharged Engines2018-02-09
SB

SB 553

Lycoming Engines

Issued 2018-02-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Crankshaft Inspection for Lycoming Six Cylinder Turbocharged Engines

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 482Crankshaft Flange Area Cracking2018-02-09
SB

SB 482

Lycoming Engines

Issued 2018-02-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Crankshaft Flange Area Cracking

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 183Magneto Timing Discrepancies2018-02-09
SB

SB 183

Lycoming Engines

Issued 2018-02-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Magneto Timing Discrepancies

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 633Oil Level Gage (Dipstick) Replacement2017-12-19
SB

SB 633

Lycoming Engines

Issued 2017-12-19

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Level Gage (Dipstick) Replacement

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 626AVStar Flow Divider (Lycoming Fuel Manifold) Inspection2017-12-19
SB

SB 626

Lycoming Engines

Issued 2017-12-19

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

AVStar Flow Divider (Lycoming Fuel Manifold) Inspection

Applies to Lycoming IO-580Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 554Crankshaft Gear Retaining Bolt Replacement2017-08-21
SB

SB 554

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Crankshaft Gear Retaining Bolt Replacement

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 529Reprint of Crane/Lear Romec Service Bulletin No. 101SB020, Rev. 32017-08-21
SB

SB 529

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Crane/Lear Romec Service Bulletin No. 101SB020, Rev. 3

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 545Oil Filler Tube Inspection-Replacement Kit Installation Modification2017-08-21
SB

SB 545

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Filler Tube Inspection-Replacement Kit Installation Modification

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 524Replacement of Oil Pump Impellers Sintered Iron and Aluminum2017-08-15
SB

SB 524

Lycoming Engines

Issued 2017-08-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement of Oil Pump Impellers Sintered Iron and Aluminum

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 547Connecting Rod Bearing Replacement on TIO-540-AE2A Model Engines2017-08-15
SB

SB 547

Lycoming Engines

Issued 2017-08-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Connecting Rod Bearing Replacement on TIO-540-AE2A Model Engines

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 632Identification of Connecting Rods with Non-Conforming Small End Bushings2017-08-03
SB

SB 632

Lycoming Engines

Issued 2017-08-03

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Identification of Connecting Rods with Non-Conforming Small End Bushings

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 480FOil Servicing, Metallic Solids Identification After Oil Servicing, and Associated Corrective Action2017-05-25
SB

SB 480F

Lycoming Engines

Issued 2017-05-25

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Servicing, Metallic Solids Identification After Oil Servicing, and Associated Corrective Action

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-08-16 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 401Recommended Guidance After a Lightning Strike2017-05-24
SB

SB 401

Lycoming Engines

Issued 2017-05-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Recommended Guidance After a Lightning Strike

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 552Crankshaft Replacement in Lycoming TIO and LTIO-540 Engines Rated at 300 Horsepower and Higher2017-05-08
SB

SB 552

Lycoming Engines

Issued 2017-05-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Crankshaft Replacement in Lycoming TIO and LTIO-540 Engines Rated at 300 Horsepower and Higher

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 539Reprint of Crane/Lear Romec Service Bulletins No. RG9080-73-001, No. RG9570-73-001, and No. RG17980-73-0012016-09-21
SB

SB 539

Lycoming Engines

Issued 2016-09-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Crane/Lear Romec Service Bulletins No. RG9080-73-001, No. RG9570-73-001, and No. RG17980-73-001

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 516Inspection and Removal of TCM and Bendix S-20 and S-1200 Series Impulse Coupling Magnetos2016-09-08
SB

SB 516

Lycoming Engines

Issued 2016-09-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection and Removal of TCM and Bendix S-20 and S-1200 Series Impulse Coupling Magnetos

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 518Inspection of Thermostatic Oil Cooler Bypass Valves2016-08-16
SB

SB 518

Lycoming Engines

Issued 2016-08-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection of Thermostatic Oil Cooler Bypass Valves

Applies to Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 624Reprint of Hartzell Engine Technologies (HET) Service Bulletin SB-0652016-06-17
SB

SB 624

Lycoming Engines

Issued 2016-06-17

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Hartzell Engine Technologies (HET) Service Bulletin SB-065

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 366Carburetor Throttle Body Screw Inspection2016-06-02
SB

SB 366

Lycoming Engines

Issued 2016-06-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Carburetor Throttle Body Screw Inspection

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 623Reprint of Hartzell Engine Technologies2016-02-03
SB

SB 623

Lycoming Engines

Issued 2016-02-03

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Hartzell Engine Technologies

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 625Alternator Fan Backplate2016-02-02
SB

SB 625

Lycoming Engines

Issued 2016-02-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Alternator Fan Backplate

Applies to Lycoming IO-580Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 621Diaphragm-Type Fuel Pump Replacement2015-10-05
SB

SB 621

Lycoming Engines

Issued 2015-10-05

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Diaphragm-Type Fuel Pump Replacement

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 614Exhaust System Inspection and Turbocharger Mounting Bracket Replacement2014-10-10
SB

SB 614

Lycoming Engines

Issued 2014-10-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Exhaust System Inspection and Turbocharger Mounting Bracket Replacement

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 613Compliance with Hartzell Engine Technologies (HET), LLC (Previously Kelly Aerospace) Alert Service Bulletin No. 057 dated 2/11/14, Turbocharger Back Plate Assembly P/N 406795­0058 Replacement2014-03-06
SB

SB 613

Lycoming Engines

Issued 2014-03-06

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Compliance with Hartzell Engine Technologies (HET), LLC (Previously Kelly Aerospace) Alert Service Bulletin No. 057 dated 2/11/14, Turbocharger Back Plate Assembly P/N 406795­0058 Replacement

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 606Correction of Engine Data Plate on IO-540-AE1A5 Engines2014-02-13
SB

SB 606

Lycoming Engines

Issued 2014-02-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Correction of Engine Data Plate on IO-540-AE1A5 Engines

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 608Replacement of Hartzell Engine Technologies' Fuel Pump Assemblies2014-02-06
SB

SB 608

Lycoming Engines

Issued 2014-02-06

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement of Hartzell Engine Technologies' Fuel Pump Assemblies

Applies to Lycoming IO-720Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 201Inspection of Crankshaft Flange2013-03-26
SB

SB 201

Lycoming Engines

Issued 2013-03-26

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection of Crankshaft Flange

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 604Compliance with Hartzell Engine Technologies, LLC Alert Service Bulletin No. 048 dated 11/16/2012, Turbocharger model TAO411, P/N 410188-0019 Turbine Wheel Replacement2012-11-21
SB

SB 604

Lycoming Engines

Issued 2012-11-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Compliance with Hartzell Engine Technologies, LLC Alert Service Bulletin No. 048 dated 11/16/2012, Turbocharger model TAO411, P/N 410188-0019 Turbine Wheel Replacement

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 603Reprint of Slick Service Bulletin SB1­-122012-10-04
SB

SB 603

Lycoming Engines

Issued 2012-10-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Slick Service Bulletin SB1­-12

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 599Compliance with Hartzell Engine Technologies, LLC Service Bulletin No. 045, 201F Fuel Pump Inspection and Recall2012-03-14
SB

SB 599

Lycoming Engines

Issued 2012-03-14

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Compliance with Hartzell Engine Technologies, LLC Service Bulletin No. 045, 201F Fuel Pump Inspection and Recall

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 601Non-Compliant Oil Fill Tubes P/N 775272011-11-22
SB

SB 601

Lycoming Engines

Issued 2011-11-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Non-Compliant Oil Fill Tubes P/N 77527

Applies to Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 598V-Band Clamp P/N LW-12125-3 and LW-12093-6 on Turbocharged Engines2011-06-01
SB

SB 598

Lycoming Engines

Issued 2011-06-01

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

V-Band Clamp P/N LW-12125-3 and LW-12093-6 on Turbocharged Engines

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 595Torque Values for Screws that Attach Ignition Harness Attachment Plate2011-05-06
SB

SB 595

Lycoming Engines

Issued 2011-05-06

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Torque Values for Screws that Attach Ignition Harness Attachment Plate

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 597Fuel Drain Valve Adapter Assembly P/N LW-138072011-05-04
SB

SB 597

Lycoming Engines

Issued 2011-05-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Fuel Drain Valve Adapter Assembly P/N LW-13807

Applies to Lycoming IO-580Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 596Reprint of AVStar Mandatory Service Bulletin AFS-SB6 Revision 22011-04-27
SB

SB 596

Lycoming Engines

Issued 2011-04-27

Manufacturer document

Manufacturer's own classification: “Mandatory Service Bulletin”. The manufacturer's classification is not an FAA requirement.

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of AVStar Mandatory Service Bulletin AFS-SB6 Revision 2

Applies to Lycoming IO-720Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 594Reprint of Hartzell Engine Technologies LLC Mandatory Service Bulletin 040A2011-01-10
SB

SB 594

Lycoming Engines

Issued 2011-01-10

Manufacturer document

Manufacturer's own classification: “Mandatory Service Bulletin”. The manufacturer's classification is not an FAA requirement.

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Hartzell Engine Technologies LLC Mandatory Service Bulletin 040A

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 398Recommended Corrective Action for Use of Incorrect Fuel2010-11-22
SB

SB 398

Lycoming Engines

Issued 2010-11-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Recommended Corrective Action for Use of Incorrect Fuel

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 543Oil Filter Converter Plate Gasket Replacement2010-09-29
SB

SB 543

Lycoming Engines

Issued 2010-09-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Filter Converter Plate Gasket Replacement

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 592Engine Inspection after Overboost2010-09-29
SB

SB 592

Lycoming Engines

Issued 2010-09-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Inspection after Overboost

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 593Intake Valve P/N 17A23942 Inspection for Date Stamp2010-08-24
SB

SB 593

Lycoming Engines

Issued 2010-08-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Intake Valve P/N 17A23942 Inspection for Date Stamp

Applies to Lycoming IO-580Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 399Action to Take if Loss of Oil Pressure2010-07-09
SB

SB 399

Lycoming Engines

Issued 2010-07-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Action to Take if Loss of Oil Pressure

Applies to Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 591Reprint of Kelly Mandatory Service Bulletin No. 039A, Turbine Wheel Replacement2010-05-10
SB

SB 591

Lycoming Engines

Issued 2010-05-10

Manufacturer document

Manufacturer's own classification: “Mandatory Service Bulletin”. The manufacturer's classification is not an FAA requirement.

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Kelly Mandatory Service Bulletin No. 039A, Turbine Wheel Replacement

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 590Use of Aircraft Boost Pump with Kelly Aerospace 200F Series Fuel Pumps2009-11-13
SB

SB 590

Lycoming Engines

Issued 2009-11-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Use of Aircraft Boost Pump with Kelly Aerospace 200F Series Fuel Pumps

Applies to Lycoming IO-580Lycoming IO-720Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 581Reprint of Precision Airmotive Mandatory Service Bulletins Nos. PRS-107, Rev. 4 and PEX-1, Rev. 12008-11-19
SB

SB 581

Lycoming Engines

Issued 2008-11-19

Manufacturer document

Manufacturer's own classification: “Mandatory Service Bulletin”. The manufacturer's classification is not an FAA requirement.

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Precision Airmotive Mandatory Service Bulletins Nos. PRS-107, Rev. 4 and PEX-1, Rev. 1

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 584Reprint of Mandatory Unison Service Bulletin No. SB3-08A2008-10-17
SB

SB 584

Lycoming Engines

Issued 2008-10-17

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Mandatory Unison Service Bulletin No. SB3-08A

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 582Reprint of Precision Airmotive Mandatory Service Bulletin No. MSA-132008-10-10
SB

SB 582

Lycoming Engines

Issued 2008-10-10

Manufacturer document

Manufacturer's own classification: “Mandatory Service Bulletin”. The manufacturer's classification is not an FAA requirement.

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Precision Airmotive Mandatory Service Bulletin No. MSA-13

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 577Reprint of Sky-Tec Service Bulletin No. 07-01, Rev. D2008-09-19
SB

SB 577

Lycoming Engines

Issued 2008-09-19

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Sky-Tec Service Bulletin No. 07-01, Rev. D

Applies to Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 583Reprint of Mandatory Unison Service Bulletin No. SB2-082008-07-21
SB

SB 583

Lycoming Engines

Issued 2008-07-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Mandatory Unison Service Bulletin No. SB2-08

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 580Reprint of Kelly Aerospace Service Bulletin No. 0292008-02-15
SB

SB 580

Lycoming Engines

Issued 2008-02-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Kelly Aerospace Service Bulletin No. 029

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 579Clearance Between Oil Sump Assembly and Oil Sump Baffle2007-11-16
SB

SB 579

Lycoming Engines

Issued 2007-11-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Clearance Between Oil Sump Assembly and Oil Sump Baffle

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 576Reprint of Teledyne Continental Ignition Systems Service Bulletin No. SB633A2007-09-21
SB

SB 576

Lycoming Engines

Issued 2007-09-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Teledyne Continental Ignition Systems Service Bulletin No. SB633A

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 578Incorrect Cylinder Assemblies Shipped with Cylinder Kits2007-09-21
SB

SB 578

Lycoming Engines

Issued 2007-09-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Incorrect Cylinder Assemblies Shipped with Cylinder Kits

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 574Cylinder Stud Hole Cross-Threaded2007-07-20
SB

SB 574

Lycoming Engines

Issued 2007-07-20

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Cylinder Stud Hole Cross-Threaded

Applies to Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 573Pressurized Magneto Pressure Tests2007-02-23
SB

SB 573

Lycoming Engines

Issued 2007-02-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Pressurized Magneto Pressure Tests

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 544Bearing Replacement Part Identitfication2006-10-06
SB

SB 544

Lycoming Engines

Issued 2006-10-06

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Bearing Replacement Part Identitfication

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 571Reprint of Sky-Tec Service Bulletin No. 2006-0-3-12006-05-05
SB

SB 571

Lycoming Engines

Issued 2006-05-05

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Sky-Tec Service Bulletin No. 2006-0-3-1

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 569Crankshaft Retirement for Certain Lycoming Engines2006-04-11
SB

SB 569

Lycoming Engines

Issued 2006-04-11

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Crankshaft Retirement for Certain Lycoming Engines

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 548Diaphragm-Type Fuel Pump Inspection/Replacement2005-08-31
SB

SB 548

Lycoming Engines

Issued 2005-08-31

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Diaphragm-Type Fuel Pump Inspection/Replacement

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 566Crankshaft Replacement in Lycoming Engines2005-07-11
SB

SB 566

Lycoming Engines

Issued 2005-07-11

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Crankshaft Replacement in Lycoming Engines

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 565Diaphragm-Type Fuel Pump Inspection/Replacement2005-02-21
SB

SB 565

Lycoming Engines

Issued 2005-02-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Diaphragm-Type Fuel Pump Inspection/Replacement

Applies to Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 388Procedure to Determine Exhaust Valve and Guide Condition2004-11-22
SB

SB 388

Lycoming Engines

Issued 2004-11-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Procedure to Determine Exhaust Valve and Guide Condition

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 561Connecting Rod Bearing Replacement on TIO-540-U2A, -V2AD, and -W2A Engines2004-08-06
SB

SB 561

Lycoming Engines

Issued 2004-08-06

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Connecting Rod Bearing Replacement on TIO-540-U2A, -V2AD, and -W2A Engines

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 559Reprint of Kelly Aerospace Power Systems Service Bulletin No. A-112, Rev. A2004-03-23
SB

SB 559

Lycoming Engines

Issued 2004-03-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Kelly Aerospace Power Systems Service Bulletin No. A-112, Rev. A

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 558Inspection of Oil Suction Screen Area for Casting Voids2003-11-17
SB

SB 558

Lycoming Engines

Issued 2003-11-17

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection of Oil Suction Screen Area for Casting Voids

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 555Oil Pump Body Plug Inspection2003-05-16
SB

SB 555

Lycoming Engines

Issued 2003-05-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Pump Body Plug Inspection

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 557Reprint of Precision Airmotive Corporation Service Bulletin No. PRS-1052003-05-07
SB

SB 557

Lycoming Engines

Issued 2003-05-07

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Precision Airmotive Corporation Service Bulletin No. PRS-105

Applies to Lycoming IO-720Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 475CCrankshaft Gear Modification and Assembly Procedures2003-01-30
SB

SB 475C

Lycoming Engines

Issued 2003-01-30

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Crankshaft Gear Modification and Assembly Procedures

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-08-16 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSB 556Replacement of Washer P/N LW-112012003-01-29
SB

SB 556

Lycoming Engines

Issued 2003-01-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement of Washer P/N LW-11201

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)

Service Instructions

133 records
SBSI 1485Exhaust Valve and Guide Identification Procedure2026-07-30
SI

SI 1485

Lycoming Engines

Issued 2026-07-30

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Exhaust Valve and Guide Identification Procedure

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL L234Tool Rental Program2026-06-25
SI

SL L234

Lycoming Engines

Issued 2026-06-25

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Tool Rental Program

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1154FAA-Approved Starters and Alternators2026-05-18
SI

SI 1154

Lycoming Engines

Issued 2026-05-18

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

FAA-Approved Starters and Alternators

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1575New Connecting Rod Bushing2026-02-10
SI

SI 1575

Lycoming Engines

Issued 2026-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

New Connecting Rod Bushing

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1014Lubricating Oil Recommendations2026-02-10
SI

SI 1014

Lycoming Engines

Issued 2026-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lubricating Oil Recommendations

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1042APPROVED SPARK PLUGS2026-01-28
SI

SI 1042

Lycoming Engines

Issued 2026-01-28

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

APPROVED SPARK PLUGS

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1481Factory Engine Preservation2025-11-24
SI

SI 1481

Lycoming Engines

Issued 2025-11-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Factory Engine Preservation

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1443Approved Slick Magnetos, Hartzell PowerUp Magnetos, and Lycoming Electronic Ignition System (EIS) on Lycoming Engines2025-11-18
SI

SI 1443

Lycoming Engines

Issued 2025-11-18

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Approved Slick Magnetos, Hartzell PowerUp Magnetos, and Lycoming Electronic Ignition System (EIS) on Lycoming Engines

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1129Methods of Checking DC Alternator and Generator Belt Tension2025-09-24
SI

SI 1129

Lycoming Engines

Issued 2025-09-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Methods of Checking DC Alternator and Generator Belt Tension

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1080Required Maintenance Items for Specific Components2025-09-24
SI

SI 1080

Lycoming Engines

Issued 2025-09-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Required Maintenance Items for Specific Components

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1304Engine Data Plate (Identification Plate) Replacement2025-08-26
SI

SI 1304

Lycoming Engines

Issued 2025-08-26

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Data Plate (Identification Plate) Replacement

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1037AAApproved Pistons, Rings, Cylinders, and Gasket Set Application for Use on Lycoming Aircraft Engines2025-07-29
SI

SI 1037AA

Lycoming Engines

Issued 2025-07-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Approved Pistons, Rings, Cylinders, and Gasket Set Application for Use on Lycoming Aircraft Engines

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1290FRepair of Oil Leakage at Crankcase Thru-Stud Locations; Assembled and Unassembled Engines.2025-06-17
SI

SI 1290F

Lycoming Engines

Issued 2025-06-17

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Repair of Oil Leakage at Crankcase Thru-Stud Locations; Assembled and Unassembled Engines.

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1588Rocker Box Cover Screws Torque Values and Torque Sequence2024-02-14
SI

SI 1588

Lycoming Engines

Issued 2024-02-14

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Rocker Box Cover Screws Torque Values and Torque Sequence

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1532Approved Fuel Injectors, Fuel Manifold Assemblies, and Fuel Nozzle Assemblies for Lycoming Engines2023-12-13
SI

SI 1532

Lycoming Engines

Issued 2023-12-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Approved Fuel Injectors, Fuel Manifold Assemblies, and Fuel Nozzle Assemblies for Lycoming Engines

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1577INTAKE VALVE IN-SERVICE DATA2023-02-10
SI

SI 1577

Lycoming Engines

Issued 2023-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

INTAKE VALVE IN-SERVICE DATA

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1324CRANKSHAFT OIL SEALS2023-02-10
SI

SI 1324

Lycoming Engines

Issued 2023-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

CRANKSHAFT OIL SEALS

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1583Front Expansion Plug Replacement2022-05-20
SI

SI 1583

Lycoming Engines

Issued 2022-05-20

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Front Expansion Plug Replacement

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1533Approved Rotary Vane Fuel Pumps2022-04-08
SI

SI 1533

Lycoming Engines

Issued 2022-04-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Approved Rotary Vane Fuel Pumps

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1587Reprint of AVStar Service Information Letter No. AFS-SIL-032022-02-03
SI

SI 1587

Lycoming Engines

Issued 2022-02-03

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of AVStar Service Information Letter No. AFS-SIL-03

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1569Installation, Operation, and Maintenance of Lycoming Electronic Ignition System (EIS)2021-04-21
SI

SI 1569

Lycoming Engines

Issued 2021-04-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Installation, Operation, and Maintenance of Lycoming Electronic Ignition System (EIS)

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1579Exhaust System Replacement Components2020-11-19
SI

SI 1579

Lycoming Engines

Issued 2020-11-19

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Exhaust System Replacement Components

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1316Repair of Oil Cooler By-Pass Valve Seat2020-08-06
SI

SI 1316

Lycoming Engines

Issued 2020-08-06

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Repair of Oil Cooler By-Pass Valve Seat

Applies to Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1060PUSH ROD IDENTIFICATION2020-04-21
SI

SI 1060

Lycoming Engines

Issued 2020-04-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

PUSH ROD IDENTIFICATION

Applies to Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1012COUNTERWEIGHTS AND ROLLERS ON ENGINE MODELS2020-04-08
SI

SI 1012

Lycoming Engines

Issued 2020-04-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

COUNTERWEIGHTS AND ROLLERS ON ENGINE MODELS

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1098PROPELLER FLANGE BUSHING LOCATION2020-04-08
SI

SI 1098

Lycoming Engines

Issued 2020-04-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

PROPELLER FLANGE BUSHING LOCATION

Applies to Lycoming IO-390Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1070SPECIFIED FUELS FOR SPARK-IGNITED GASOLINE AIRCRAFT ENGINE MODELS2020-04-07
SI

SI 1070

Lycoming Engines

Issued 2020-04-07

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

SPECIFIED FUELS FOR SPARK-IGNITED GASOLINE AIRCRAFT ENGINE MODELS

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 277Hartzell Engine Technologies and Lycoming Engines Alternator Distribution Agreement2019-12-17
SI

SL 277

Lycoming Engines

Issued 2019-12-17

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Hartzell Engine Technologies and Lycoming Engines Alternator Distribution Agreement

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 278Lycoming Engines' Product Support Hours2019-07-13
SI

SL 278

Lycoming Engines

Issued 2019-07-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Engines' Product Support Hours

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1279Oil Sump Baffle Replacement2019-05-15
SI

SI 1279

Lycoming Engines

Issued 2019-05-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Sump Baffle Replacement

Applies to Lycoming IO-580Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1011Tappets and Lifters2019-01-08
SI

SI 1011

Lycoming Engines

Issued 2019-01-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Tappets and Lifters

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1571Lockplate installation for Induction Housing on TIO-540-AJ1A and IO-540-AC1A52018-08-24
SI

SI 1571

Lycoming Engines

Issued 2018-08-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lockplate installation for Induction Housing on TIO-540-AJ1A and IO-540-AC1A5

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 247Shelf Life Requirements2018-08-24
SI

SL 247

Lycoming Engines

Issued 2018-08-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Shelf Life Requirements

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1570Alternate Oil Sump Fitting Configuration for Aerobatic Inverted Oil System2018-08-02
SI

SI 1570

Lycoming Engines

Issued 2018-08-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Alternate Oil Sump Fitting Configuration for Aerobatic Inverted Oil System

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 275Warranty Procedure for Exhaust System Replacement Referenced in the most current revision of SB6272018-05-16
SI

SL 275

Lycoming Engines

Issued 2018-05-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Warranty Procedure for Exhaust System Replacement Referenced in the most current revision of SB627

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 253Warranty Repair of AVStar Fuel Systems, Inc. Fuel Control Products2018-04-15
SI

SL 253

Lycoming Engines

Issued 2018-04-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Warranty Repair of AVStar Fuel Systems, Inc. Fuel Control Products

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1241Pre-Oiling Engine Prior to Initial Start2018-02-09
SI

SI 1241

Lycoming Engines

Issued 2018-02-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Pre-Oiling Engine Prior to Initial Start

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1094Fuel Mixture Leaning Procedures2018-02-09
SI

SI 1094

Lycoming Engines

Issued 2018-02-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Fuel Mixture Leaning Procedures

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1437Engine Timing Marks2018-02-09
SI

SI 1437

Lycoming Engines

Issued 2018-02-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Timing Marks

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1193Inspection in Event of Valve Failure2018-02-09
SI

SI 1193

Lycoming Engines

Issued 2018-02-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection in Event of Valve Failure

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1514Roller Tappets Part Information Update2018-02-04
SI

SI 1514

Lycoming Engines

Issued 2018-02-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Roller Tappets Part Information Update

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1505Cold Weather Starting2017-08-21
SI

SI 1505

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Cold Weather Starting

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1500Counterweight Roller Change for Robinson Helicopter2017-08-21
SI

SI 1500

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Counterweight Roller Change for Robinson Helicopter

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1191Cylinder Compression2017-08-21
SI

SI 1191

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Cylinder Compression

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1187Turbocharger Density Controller Adjustment2017-08-21
SI

SI 1187

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Turbocharger Density Controller Adjustment

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1435Conversion from Constant Speed to Fixed Pitch Propeller and Vice Versa; Propeller Governor Oil Line Nut and Elbow2017-08-21
SI

SI 1435

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Conversion from Constant Speed to Fixed Pitch Propeller and Vice Versa; Propeller Governor Oil Line Nut and Elbow

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1341Oil Pump Idler Shaft Lubrication2017-08-21
SI

SI 1341

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Pump Idler Shaft Lubrication

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1047Inspection and Reconditioning Procedures for Nitride Hardened Steel Cylinders2017-08-21
SI

SI 1047

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection and Reconditioning Procedures for Nitride Hardened Steel Cylinders

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 180Engine Preservation for Active and Stored Aircraft2017-08-21
SI

SL 180

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Preservation for Active and Stored Aircraft

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 197Recommendations to Avoid Valve Sticking2017-08-21
SI

SL 197

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Recommendations to Avoid Valve Sticking

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 185The Use of Higher Octane Aviation Fuel, 100LL Blue or 100 Green, for Engines Rated for 80/87 Octane Fuel2017-08-21
SI

SL 185

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

The Use of Higher Octane Aviation Fuel, 100LL Blue or 100 Green, for Engines Rated for 80/87 Octane Fuel

Applies to Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 192Spark Plug Fouling2017-08-21
SI

SL 192

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Spark Plug Fouling

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 171General Aspects of Spectrometric Oil Analysis2017-08-21
SI

SL 171

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

General Aspects of Spectrometric Oil Analysis

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1029Tightening Procedures for Crankcase Thru-Studs and Bolts2017-08-04
SI

SI 1029

Lycoming Engines

Issued 2017-08-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Tightening Procedures for Crankcase Thru-Studs and Bolts

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1285Non-Destructive Testing of Lycoming Engine Parts2017-07-19
SI

SI 1285

Lycoming Engines

Issued 2017-07-19

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Non-Destructive Testing of Lycoming Engine Parts

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1425Suggested Maintenance Procedures to Reduce the Possibility of Valve Sticking2017-05-08
SI

SI 1425

Lycoming Engines

Issued 2017-05-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Suggested Maintenance Procedures to Reduce the Possibility of Valve Sticking

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1565Replacement Thermostatic Oil Cooler Bypass Valves2017-05-03
SI

SI 1565

Lycoming Engines

Issued 2017-05-03

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement Thermostatic Oil Cooler Bypass Valves

Applies to Lycoming IO-390Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 270Extended Maintenance Intervals for Spark-Ignited Engines Operated on Unleaded Fuels2017-04-07
SI

SL 270

Lycoming Engines

Issued 2017-04-07

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Extended Maintenance Intervals for Spark-Ignited Engines Operated on Unleaded Fuels

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 271How to Access Lycoming Digital Technical Publications2017-02-15
SI

SL 271

Lycoming Engines

Issued 2017-02-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

How to Access Lycoming Digital Technical Publications

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1008Installation of Thermostatic Oil Cooler Bypass Valve2016-07-21
SI

SI 1008

Lycoming Engines

Issued 2016-07-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Installation of Thermostatic Oil Cooler Bypass Valve

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1408Engine Mounting Bracket Replacement2016-06-17
SI

SI 1408

Lycoming Engines

Issued 2016-06-17

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Mounting Bracket Replacement

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1397Overflow Oil from Breather Fitting of Inverted Oil System2016-06-01
SI

SI 1397

Lycoming Engines

Issued 2016-06-01

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Overflow Oil from Breather Fitting of Inverted Oil System

Applies to Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1423Thermostatic Oil Cooler Bypass Valve Part Number2016-05-13
SI

SI 1423

Lycoming Engines

Issued 2016-05-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Thermostatic Oil Cooler Bypass Valve Part Number

Applies to Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1301Identification of Primer and Fuel Injector Lines2016-05-13
SI

SI 1301

Lycoming Engines

Issued 2016-05-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Identification of Primer and Fuel Injector Lines

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1255Thermostatic Oil Cooler Valve Replacement2016-05-13
SI

SI 1255

Lycoming Engines

Issued 2016-05-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Thermostatic Oil Cooler Valve Replacement

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 255Approved Diaphragm-Type Fuel Pump2016-05-13
SI

SL 255

Lycoming Engines

Issued 2016-05-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Approved Diaphragm-Type Fuel Pump

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1523Lycoming Engines’ Carburetor Manufacturer Cross-References2016-03-16
SI

SI 1523

Lycoming Engines

Issued 2016-03-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Engines’ Carburetor Manufacturer Cross-References

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1560Propeller Governor Drive Set Screw Inspection2016-03-10
SI

SI 1560

Lycoming Engines

Issued 2016-03-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Propeller Governor Drive Set Screw Inspection

Applies to Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1566Lycoming Engines Approves the Use of Safety Cable2016-03-10
SI

SI 1566

Lycoming Engines

Issued 2016-03-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Engines Approves the Use of Safety Cable

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1059Pre-Lubrication of Parts Before Assembly2016-01-27
SI

SI 1059

Lycoming Engines

Issued 2016-01-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Pre-Lubrication of Parts Before Assembly

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 264Engine Start Problems Due to Drift in Magneto-to-Engine Timing Reprint of Champion Slick Magneto Service Letter 4300/6300-74-20-001, dated February 18, 2015.2016-01-27
SI

SL 264

Lycoming Engines

Issued 2016-01-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Start Problems Due to Drift in Magneto-to-Engine Timing Reprint of Champion Slick Magneto Service Letter 4300/6300-74-20-001, dated February 18, 2015.

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 263Discolored Paint on Cylinder2015-03-11
SI

SL 263

Lycoming Engines

Issued 2015-03-11

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Discolored Paint on Cylinder

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1559Adjusting Fuel Pressure on AN-Drive Type Fuel Pumps2014-11-26
SI

SI 1559

Lycoming Engines

Issued 2014-11-26

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Adjusting Fuel Pressure on AN-Drive Type Fuel Pumps

Applies to Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1562Turbocharged Exhaust System Installation2014-06-05
SI

SI 1562

Lycoming Engines

Issued 2014-06-05

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Turbocharged Exhaust System Installation

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1141Replacement of Worn Starter Ring Gears2014-05-09
SI

SI 1141

Lycoming Engines

Issued 2014-05-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement of Worn Starter Ring Gears

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1554Zip Strap Replacement2014-05-07
SI

SI 1554

Lycoming Engines

Issued 2014-05-07

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Zip Strap Replacement

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 258Part Number Supersedure for External Retaining Ring2013-08-27
SI

SL 258

Lycoming Engines

Issued 2013-08-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Part Number Supersedure for External Retaining Ring

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 254Lycoming Model Designation for all Carburetors2013-04-15
SI

SL 254

Lycoming Engines

Issued 2013-04-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Model Designation for all Carburetors

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1546Specific Requirements for Installation and Removal of Electrical Lead on Hartzell Engine Technologies, LLC Starters2012-10-04
SI

SI 1546

Lycoming Engines

Issued 2012-10-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Specific Requirements for Installation and Removal of Electrical Lead on Hartzell Engine Technologies, LLC Starters

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1549Notification of Approved Fuel Pump Plunger P/N 23D267772012-06-27
SI

SI 1549

Lycoming Engines

Issued 2012-06-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Notification of Approved Fuel Pump Plunger P/N 23D26777

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1256Valve Guides For Service Use2012-04-05
SI

SI 1256

Lycoming Engines

Issued 2012-04-05

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Valve Guides For Service Use

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1458Connecting Rod Bolts2012-03-06
SI

SI 1458

Lycoming Engines

Issued 2012-03-06

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Connecting Rod Bolts

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1414Bendix Service Bulletin No. RS­77, Rev. 22012-02-27
SI

SI 1414

Lycoming Engines

Issued 2012-02-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Bendix Service Bulletin No. RS­77, Rev. 2

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1543Notification of Approved Tappet P/N 15B262622012-02-23
SI

SI 1543

Lycoming Engines

Issued 2012-02-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Notification of Approved Tappet P/N 15B26262

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1457Optional Remote­Mounted Oil Filter Kits2012-02-01
SI

SI 1457

Lycoming Engines

Issued 2012-02-01

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Optional Remote­Mounted Oil Filter Kits

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1143Counterweight Bushing Inspection, Replacement, and Special Tooling Upgrades2011-11-10
SI

SI 1143

Lycoming Engines

Issued 2011-11-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Counterweight Bushing Inspection, Replacement, and Special Tooling Upgrades

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1535Counterweight and Roller Removal, Inspection, and Installation2011-10-31
SI

SI 1535

Lycoming Engines

Issued 2011-10-31

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Counterweight and Roller Removal, Inspection, and Installation

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 220Wide Deck Cylinder Configuration on Lycoming Engines2011-08-02
SI

SL 220

Lycoming Engines

Issued 2011-08-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Wide Deck Cylinder Configuration on Lycoming Engines

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 250Lycoming Engines Exchange Engine Core Policy2011-07-29
SI

SL 250

Lycoming Engines

Issued 2011-07-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Engines Exchange Engine Core Policy

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1484Installation Torque for Fuel Metering Device, Carburetor, Fuel Injector Servo or "AN" Fuel Pump Hold Down Nuts2011-03-29
SI

SI 1484

Lycoming Engines

Issued 2011-03-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Installation Torque for Fuel Metering Device, Carburetor, Fuel Injector Servo or "AN" Fuel Pump Hold Down Nuts

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1442Improved Oil Filter Bypass Valve2011-03-28
SI

SI 1442

Lycoming Engines

Issued 2011-03-28

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Improved Oil Filter Bypass Valve

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1420Fuel Pump Drive Spline Lubrication2011-02-25
SI

SI 1420

Lycoming Engines

Issued 2011-02-25

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Fuel Pump Drive Spline Lubrication

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1539Fuel Manifold Spring Change2011-02-04
SI

SI 1539

Lycoming Engines

Issued 2011-02-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Fuel Manifold Spring Change

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1530Engine Inspection in Particulate-Laden Environments2011-02-04
SI

SI 1530

Lycoming Engines

Issued 2011-02-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Inspection in Particulate-Laden Environments

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1534Service Recommendations for Long-Term Storage of Engines That Use Automotive Fuel2011-01-27
SI

SI 1534

Lycoming Engines

Issued 2011-01-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Service Recommendations for Long-Term Storage of Engines That Use Automotive Fuel

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1427Lycoming Reciprocating Engine Break-In and Oil Consumption2010-12-29
SI

SI 1427

Lycoming Engines

Issued 2010-12-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Reciprocating Engine Break-In and Oil Consumption

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1483Valve Leak Check with Engine Cylinder Removed2010-12-21
SI

SI 1483

Lycoming Engines

Issued 2010-12-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Valve Leak Check with Engine Cylinder Removed

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 251Connecting Rod Bolt Marking2010-11-23
SI

SL 251

Lycoming Engines

Issued 2010-11-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Connecting Rod Bolt Marking

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1453Procedure to Replace Oil Filter Converter Plate Gasket2010-09-24
SI

SI 1453

Lycoming Engines

Issued 2010-09-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Procedure to Replace Oil Filter Converter Plate Gasket

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1299Magneto Drive Gear and Cushion Modification2010-09-24
SI

SI 1299

Lycoming Engines

Issued 2010-09-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Magneto Drive Gear and Cushion Modification

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1204Exhaust Flange Gaskets2010-08-26
SI

SI 1204

Lycoming Engines

Issued 2010-08-26

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Exhaust Flange Gaskets

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1132Magneto Drop-Off2010-06-18
SI

SI 1132

Lycoming Engines

Issued 2010-06-18

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Magneto Drop-Off

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1531Alternator Bracket for Engines Equipped with Kelly Aerospace E-drive Starters2010-06-11
SI

SI 1531

Lycoming Engines

Issued 2010-06-11

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Alternator Bracket for Engines Equipped with Kelly Aerospace E-drive Starters

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1238Assembly and Torque Procedures for V-Band Couplings2010-01-06
SI

SI 1238

Lycoming Engines

Issued 2010-01-06

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Assembly and Torque Procedures for V-Band Couplings

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1528Aircraft Engine Starter Recommendations2009-12-15
SI

SI 1528

Lycoming Engines

Issued 2009-12-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Aircraft Engine Starter Recommendations

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1424Installation Procedure for P/N 15B26066 Hydraulic Tappet/Plunger Assemblies2009-12-15
SI

SI 1424

Lycoming Engines

Issued 2009-12-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Installation Procedure for P/N 15B26066 Hydraulic Tappet/Plunger Assemblies

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1267Piston Pin Plug Usage2009-08-28
SI

SI 1267

Lycoming Engines

Issued 2009-08-28

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Piston Pin Plug Usage

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 240Part Numbers Identified by Lycoming with -70 or -85 Suffix2009-05-27
SI

SL 240

Lycoming Engines

Issued 2009-05-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Part Numbers Identified by Lycoming with -70 or -85 Suffix

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1492Piston Pin Plug Wear Inspection2009-03-20
SI

SI 1492

Lycoming Engines

Issued 2009-03-20

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Piston Pin Plug Wear Inspection

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1409Lycoming Engines P/N LW-16702, Oil Additive2009-02-20
SI

SI 1409

Lycoming Engines

Issued 2009-02-20

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Engines P/N LW-16702, Oil Additive

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1525Reprint of Precision Service Information Letter No. SIL RS-922009-01-16
SI

SI 1525

Lycoming Engines

Issued 2009-01-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Precision Service Information Letter No. SIL RS-92

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1522Reprint of Precision Service Information Letter No. SIL RS-62 Revision 22008-11-19
SI

SI 1522

Lycoming Engines

Issued 2008-11-19

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Precision Service Information Letter No. SIL RS-62 Revision 2

Applies to Lycoming IO-580Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1521Reprint of Precision Service Information Letter No. SIL RS-35 Revision 12008-11-19
SI

SI 1521

Lycoming Engines

Issued 2008-11-19

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Precision Service Information Letter No. SIL RS-35 Revision 1

Applies to Lycoming IO-580Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1275Cleaning Fuel Injector Nozzles2008-09-23
SI

SI 1275

Lycoming Engines

Issued 2008-09-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Cleaning Fuel Injector Nozzles

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1519Reprint of Precision Service Information Letter No. SIL RS-87 Revision 12008-09-19
SI

SI 1519

Lycoming Engines

Issued 2008-09-19

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Precision Service Information Letter No. SIL RS-87 Revision 1

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1520Reprint of Precision Service Information Letter No. SIL RS-882008-08-22
SI

SI 1520

Lycoming Engines

Issued 2008-08-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Precision Service Information Letter No. SIL RS-88

Applies to Lycoming IO-580Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1257Horsepower, Manifold Pressure and RPM Values2008-05-16
SI

SI 1257

Lycoming Engines

Issued 2008-05-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Horsepower, Manifold Pressure and RPM Values

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1518Reprint of Precision Service Information Letter No. SIL RS-842008-03-14
SI

SI 1518

Lycoming Engines

Issued 2008-03-14

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Precision Service Information Letter No. SIL RS-84

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 245Special Service Publication No. SSP-567, "Camshaft Regrinding"2007-11-02
SI

SL 245

Lycoming Engines

Issued 2007-11-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Special Service Publication No. SSP-567, "Camshaft Regrinding"

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1148Use of Carburetor Heat Control2007-10-12
SI

SI 1148

Lycoming Engines

Issued 2007-10-12

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Use of Carburetor Heat Control

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1343Set Screw for Propeller Governor Idler Shaft2007-06-15
SI

SI 1343

Lycoming Engines

Issued 2007-06-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Set Screw for Propeller Governor Idler Shaft

Applies to Lycoming IO-580Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 221Warranty Repair of Precision Airmotive Corporation Fuel Control Products2007-06-15
SI

SL 221

Lycoming Engines

Issued 2007-06-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Warranty Repair of Precision Airmotive Corporation Fuel Control Products

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1308Pressurized Magneto Pressure Test2007-02-02
SI

SI 1308

Lycoming Engines

Issued 2007-02-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Pressurized Magneto Pressure Test

Applies to Lycoming IO-720Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1517Timing Change for TIO-540-AK1A Series Engines2006-10-27
SI

SI 1517

Lycoming Engines

Issued 2006-10-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Timing Change for TIO-540-AK1A Series Engines

Applies to Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1340Piston Pin Identification2006-05-25
SI

SI 1340

Lycoming Engines

Issued 2006-05-25

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Piston Pin Identification

Applies to Lycoming IO-720Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 173Slick Aircraft Products Service Bulletin No. SB2-80C2006-03-10
SI

SL 173

Lycoming Engines

Issued 2006-03-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Slick Aircraft Products Service Bulletin No. SB2-80C

Applies to Lycoming IO-390Lycoming IO-580Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1438Propeller Governor Pad Plate P/N LW-123472005-12-09
SI

SI 1438

Lycoming Engines

Issued 2005-12-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Propeller Governor Pad Plate P/N LW-12347

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1164Oil Pump Application2005-04-12
SI

SI 1164

Lycoming Engines

Issued 2005-04-12

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Pump Application

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSL 242Improved Lower Idle Valve in Fuel Injectors2005-01-06
SI

SL 242

Lycoming Engines

Issued 2005-01-06

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Improved Lower Idle Valve in Fuel Injectors

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1513Reprint of Lamar Service Information Letter No. LSI-0092004-09-23
SI

SI 1513

Lycoming Engines

Issued 2004-09-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Lamar Service Information Letter No. LSI-009

Applies to Lycoming O-360Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1512Main and Connecting Rod Bearing Upgrade2004-09-23
SI

SI 1512

Lycoming Engines

Issued 2004-09-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Main and Connecting Rod Bearing Upgrade

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1462Propeller Oil Control Leak Test Procedure2003-07-10
SI

SI 1462

Lycoming Engines

Issued 2003-07-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Propeller Oil Control Leak Test Procedure

Applies to Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)
SBSI 1509Replacement of all P/N STD 1409 Nuts with P/N STD-2249 Nuts2003-04-25
SI

SI 1509

Lycoming Engines

Issued 2003-04-25

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement of all P/N STD 1409 Nuts with P/N STD-2249 Nuts

Applies to Lycoming IO-390Lycoming IO-580Lycoming IO-720Lycoming O-235Lycoming O-320Lycoming O-360Lycoming O-435Lycoming O-540

Source: Lycoming Engines, retrieved 2026-09-01 · manufacturer page (opens in a new tab)

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject to governing law; bulletin copyright remains with the manufacturer or other rights holder.

View on Lycoming Engines' site (opens in a new tab)

This page indexes 19 ADs and 223 SBs from primary sources. The FAA may have issued additional directives for this engine that are not yet included.

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