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Engine model

Lycoming O-360

Lycoming Engines

Airworthiness Directives
12
Manufacturer bulletins
21977 Service Bulletins, 142 Service Instructions
Last live check
2026-10-0212 of 12 re-checked, oldest 2026-10-01

Printed from https://aircraftdirectives.com/engine/lycoming-o-360 · 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-360

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What directives and bulletins apply to the Lycoming O-360

The FAA has published 12 Airworthiness Directives that name the Lycoming O-360 (Lycoming Engines), the earliest in 1995 and the newest on 2022-07-29. 219 manufacturer bulletins from Lycoming Engines name this engine too.

Newest

  1. AD 2022-16-03 Airworthiness Directives; Continental Aerospace Technologies, Inc., Lycoming Engines, and ... 2022-07-29
  2. AD 2020-25-12 Airworthiness Directives; Superior Air Parts, Inc. Engines and Lycoming Engines Reciprocat... 2020-12-11
  3. AD 2012-19-01 Airworthiness Directives; Lycoming Engines Reciprocating Engines 2012-09-19

See all 12 directives

The ones owners meet again

  1. AD 2009-02-03 Airworthiness Directives; Lycoming Engines IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, an... 2009-01-23 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 SI 1009BF Time Between Overhaul (TBO) Schedules Open the bulletin
  3. SI SL L234 Tool Rental Program Open the bulletin
  4. SI SI 1154 FAA-Approved Starters and Alternators Open the bulletin
  5. SB SB 533 Recommended Action for Sudden Engine Stoppage, Propeller/Rotor Strike or Loss of Propeller... 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

12 records
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

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ADAD 2020-25-12Superior Air Parts, Inc. Engines and Lycoming Engines Reciprocating Engines With a Certain SAP Crankshaft Assembly2021-01-15Active
AD

2020-25-12

FR doc 2020-27149 · 85 FR 79828

AD 2020-25-12Published 2020-12-11Effective 2021-01-15

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.

Superior Air Parts, Inc. Engines and Lycoming Engines Reciprocating Engines With a Certain SAP Crankshaft Assembly

Requires the removal from service of all affected crankshaft assemblies.

Full official abstract

Airworthiness Directives; Superior Air Parts, Inc. Engines and Lycoming Engines Reciprocating Engines With a Certain SAP Crankshaft Assembly

The FAA is adopting a new airworthiness directive (AD) for all Superior Air Parts, Inc. (SAP) Model IO-360-series and O-360-series reciprocating engines and certain Lycoming Engines (Lycoming) Model AEIO-360-, IO-360-, and O-360-series reciprocating engines with a certain SAP crankshaft assembly installed. This SAP crankshaft assembly is installed as original equipment on the affected SAP engines and as a replacement part under parts manufacturer approval (PMA) on the affected Lycoming engines. This AD was prompted by three crankshaft assembly failures that resulted in the loss of engine power and immediate or emergency landings. This AD requires the removal from service of all affected crankshaft assemblies. The FAA is issuing this AD to address the unsafe condition on these products.

Source: Federal Register document 2020-27149, 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 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 2009-02-03Lycoming Engines IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, and HIO Series Reciprocating Engines, Teledyne Continental Motors (TCM) LTSIO-360-RB and TSIO-360-RB Reciprocating Engines, and Superior Air Parts, Inc. IO-360 Series Reciprocating Engines With Certain Precision Airmotive LLC RSA-5 and RSA-10 Series, and Bendix RSA-5 and RSA-10 Series, Fuel Injection Servos2009-02-09Active
AD

2009-02-03

FR doc E9-1047 · 74 FR 4123

AD 2009-02-03Published 2009-01-23Effective 2009-02-09

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 IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, and HIO Series Reciprocating Engines, Teledyne Continental Motors (TCM) LTSIO-360-RB and TSIO-360-RB Reciprocating Engines, and Superior Air Parts, Inc. IO-360 Series Reciprocating Engines With Certain Precision Airmotive LLC RSA-5 and RSA-10 Series, and Bendix RSA-5 and RSA-10 Series, Fuel Injection Servos

Requires inspecting servo plugs for looseness and damage on fuel injection servos that have a servo plug gasket, part number (P/N) 365533, installed, and if loose, inspecting the servo regulator cover threads for damage…

Full official abstract

Airworthiness Directives; Lycoming Engines IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, and HIO Series Reciprocating Engines, Teledyne Continental Motors (TCM) LTSIO-360-RB and TSIO-360-RB Reciprocating Engines, and Superior Air Parts, Inc. IO-360 Series Reciprocating Engines With Certain Precision Airmotive LLC RSA-5 and RSA-10 Series, and Bendix RSA-5 and RSA-10 Series, Fuel Injection Servos

The FAA is superseding an existing airworthiness directive (AD) for Lycoming Engines IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, and HIO series reciprocating engines, TCM TSIO-360-RB reciprocating engines, and Superior Air Parts, Inc. IO-360 series reciprocating engines with certain Precision Airmotive LLC RSA-5 and RSA-10 series fuel injection servos. That AD currently requires inspecting servo plugs for looseness and damage on fuel injection servos that have a servo plug gasket, part number (P/N) 365533, installed, and if loose, inspecting the servo regulator cover threads for damage, inspecting the gasket for damage, reinstalling acceptable parts, and torquing the servo plug to a new, higher torque to maintain the proper clamp-up force between the plug and cover. This AD requires the same inspections, except if the plug is found loose, servo plug gasket, P/N 365533, must be replaced with a new, improved gasket, P/N 2577258. This AD also requires replacement by December 31, 2009, of servo plug gaskets, P/N 365533, manufactured and made available on or after August 22, 2006, as mandatory terminating action to the repetitive inspections required by this AD. This AD also prohibits the installation of any servo plug gasket, P/N 365533. This AD also clarifies the TCM engine model applicability, and adds Bendix RSA-5 and RSA-10 series fuel injection servos to the applicability. This AD results from Precision Airmotive LLC introducing the installation of a new improved servo plug gasket, P/N 2577258, to the affected Precision Airmotive LLC RSA-5 and RSA-10 series, and Bendix RSA-5 and RSA-10 series, fuel injection servos. We are issuing this AD to prevent a lean running engine, which could result in a substantial loss of engine power and subsequent loss of control of the airplane.

Source: Federal Register document E9-1047, 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 2008-08-14Lycoming Engines IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, and HIO Series Reciprocating Engines, Teledyne Continental Motors (TCM) TSIO-360-RB Reciprocating Engines, and Superior Air Parts, Inc. IO-360 Series Reciprocating Engines With Certain Precision Airmotive LLC RSA-5 and RSA-10 Series Fuel Injection Servos2008-04-29Active
AD

2008-08-14

FR doc E8-7574 · 73 FR 19977

AD 2008-08-14Published 2008-04-14Effective 2008-04-29

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 IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, and HIO Series Reciprocating Engines, Teledyne Continental Motors (TCM) TSIO-360-RB Reciprocating Engines, and Superior Air Parts, Inc. IO-360 Series Reciprocating Engines With Certain Precision Airmotive LLC RSA-5 and RSA-10 Series Fuel Injection Servos

Prompted by eighteen reports of fuel injection servo plugs, part number (P/N) 383493, that had loosened or completely backed out of the threaded plug hole on the regulator cover of the fuel injection servo.

Full official abstract

Airworthiness Directives; Lycoming Engines IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, and HIO Series Reciprocating Engines, Teledyne Continental Motors (TCM) TSIO-360-RB Reciprocating Engines, and Superior Air Parts, Inc. IO-360 Series Reciprocating Engines With Certain Precision Airmotive LLC RSA-5 and RSA-10 Series Fuel Injection Servos

This document publishes in the Federal Register an amendment adopting emergency airworthiness directive (AD) 2008-06-51 that was sent previously to all known U.S. owners and operators of Lycoming Engines IO, (L)IO, TIO, (L)TIO, AEIO, AIO, IGO, IVO, and HIO series reciprocating engines, TCM TSIO-360-RB reciprocating engines, and Superior Air Parts, Inc. IO-360 series reciprocating engines with certain Precision Airmotive LLC RSA-5 and RSA-10 series fuel injection servos. This AD results from eighteen reports of fuel injection servo plugs, part number (P/N) 383493, that had loosened or completely backed out of the threaded plug hole on the regulator cover of the fuel injection servo. These servo plugs were installed with servo plug gasket, P/N 365533, under the plug hex-head. We are issuing this AD to prevent a lean running engine, which could result in a substantial loss of engine power and subsequent loss of control of the airplane.

Source: Federal Register document E8-7574, 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 2008-08-14 (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 2006-06-16Lycoming Engines (Formerly Textron Lycoming) AEIO-360, IO-360, O-360, LIO-360, and LO-360 Series Reciprocating Engines2006-04-27Active
AD

2006-06-16

FR doc 06-2759 · 71 FR 14638

AD 2006-06-16Published 2006-03-23Effective 2006-04-27

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.

Lycoming Engines (Formerly Textron Lycoming) AEIO-360, IO-360, O-360, LIO-360, and LO-360 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, and LO-360 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, and LO-360 series reciprocating engines. This AD requires replacing certain crankshafts. This AD results from a crankshaft failure in a Lycoming LO-360-A1H6 reciprocating engine. 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 06-2759, retrieved 2026-08-14 · checked against the live Federal Register record on 2026-10-02

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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 2004-25-22Great Lakes Aircraft Company, LLC, Models 2T-1A-1 and 2T-1A-2 Airplanes2005-01-28Active
AD

2004-25-22

FR doc 04-27521 · 69 FR 75236

AD 2004-25-22Published 2004-12-16Effective 2005-01-28

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.

Great Lakes Aircraft Company, LLC, Models 2T-1A-1 and 2T-1A-2 Airplanes

Requires you to inspect the engine induction system and the alternate air door for any signs of damage and repairing or replacing any damaged components.

Full official abstract

Airworthiness Directives; Great Lakes Aircraft Company, LLC, Models 2T-1A-1 and 2T-1A-2 Airplanes

The FAA supersedes Airworthiness Directive (AD) 79-20-08, which applies to all Great Lakes Aircraft Company, LLC, (Great Lakes) Models 2T-1A-1 and 2T-1A-2 airplanes with a Lycoming IO-360-B1F6 or AIO-360-B1G6 engine installed. AD 79-20-08 currently requires you to inspect the engine induction system and the alternate air door for any signs of damage and repairing or replacing any damaged components. AD 79-20-08 also requires you to inspect the induction system for the presence of a drain fitting. If the drain fitting is blocked, restricted, or does not exist, AD 79-20-08 requires you to clear the fitting or drill a hole in the elbow at the fitting location. This AD is the result of the FAA inadvertently omitting Lycoming engine AEIO- 360-B1G6 from the applicability section of AD 79-20-08. Consequently, this AD retains the actions required in AD 79-20-08 and adds Lycoming engine AEIO-360-B1G6 to the applicability section. We are issuing this AD to prevent the aircraft induction system from becoming blocked or restricted, which could result in engine failure. This failure could lead to loss of control of the airplane.

Source: Federal Register document 04-27521, retrieved 2026-08-14 · checked against the live Federal Register record on 2026-10-02

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ADAD 98-02-08Certain Textron Lycoming 320 and 360 Series Reciprocating Engines1998-03-30Active
AD

98-02-08

FR doc 98-1705 · 63 FR 4154

AD 98-02-08Published 1998-01-28Effective 1998-03-30

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.

Certain Textron Lycoming 320 and 360 Series Reciprocating Engines

Requires visual inspections of the inside diameter (ID) of the crankshaft for corrosion pits, and if corrosion pits are found during this inspection, prior to further flight, performing a magnetic particle inspection (MPI) or…

Full official abstract

Airworthiness Directives; Certain Textron Lycoming 320 and 360 Series Reciprocating Engines

This amendment adopts a new airworthiness directive (AD), applicable to certain Textron Lycoming 320 and 360 series reciprocating engines, that requires visual inspections of the inside diameter (ID) of the crankshaft for corrosion pits, and if corrosion pits are found during this inspection, prior to further flight, performing a magnetic particle inspection (MPI) or fluorescent penetrant inspection (FPI) of the ID for cracks. In addition, this AD requires reporting findings of inspections to the FAA. Finally, terminating action to the inspections of this AD is the application of a preventive treatment coating on non- corroded crankshafts to prevent corrosion. This amendment is prompted by reports of cracks in crankshafts originating from corrosion pits in the ID. The actions specified by this AD are intended to prevent crankshaft failure, which can result in engine failure, propeller separation, forced landing, and possible damage to the aircraft.

Source: Federal Register document 98-1705, retrieved 2026-08-17 · checked against the live Federal Register record on 2026-10-01

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ADAD 69-09-03 R3Sensenich Propeller Manufacturing Company Inc. Models M76EMM, M76EMMS, 76EM8, and 76EM8S() Metal Propellers1996-06-13Active
AD

69-09-03 R3

FR doc 96-11257 · 61 FR 21071

AD 69-09-03 R3Published 1996-05-09Effective 1996-06-13

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.

Sensenich Propeller Manufacturing Company Inc. Models M76EMM, M76EMMS, 76EM8, and 76EM8S() Metal Propellers

Prompted by inquiries concerning tachometer red arc restrictions on certain Textron Lycoming O-360 series reciprocating engines with solid crankshafts.

Full official abstract

Airworthiness Directives; Sensenich Propeller Manufacturing Company Inc. Models M76EMM, M76EMMS, 76EM8, and 76EM8S() Metal Propellers

This amendment revises an existing airworthiness directive (AD), applicable to Sensenich Propeller Manufacturing Company Inc. Models M76EMM, M76EMMS, 76EM8, and 76EM8S() metal propellers, that currently restricts operators from continuously operating the propeller at engine speeds from 2,150 to 2,350 revolutions per minute (RPM) and specifies propeller inspection and rework or replacement. This amendment eliminates the requirement to add tachometer markings on aircraft with certain additional Textron Lycoming O-360 series reciprocating engines with solid crankshafts installed, and updates the referenced Sensenich Propeller Company Inc. service bulletin to the latest revision. Reworking of all affected propeller models remains a requirement of the AD, regardless of engine installation. This amendment is prompted by inquiries concerning tachometer red arc restrictions on certain Textron Lycoming O-360 series reciprocating engines with solid crankshafts. The actions specified by this AD are intended to prevent propeller blade tip fatigue failure, which can result in loss of control of the aircraft.

Source: Federal Register document 96-11257, retrieved 2026-08-14 · checked against the live Federal Register record on 2026-10-02

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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

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)

Service Bulletins

77 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 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 658Starter Inspection, Hartzell Engine Tech (HET) Service Bulletin (SB) No.2112025-01-09
SB

SB 658

Lycoming Engines

Issued 2025-01-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Starter Inspection, Hartzell Engine Tech (HET) Service Bulletin (SB) No.211

Applies to Lycoming O-360

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 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 639Inspection of Rocker Arm, Part Number LW-150142020-01-17
SB

SB 639

Lycoming Engines

Issued 2020-01-17

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection of Rocker Arm, Part Number LW-15014

Applies to Lycoming O-320Lycoming O-360

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 622Reprint of Slick/Champion Aerospace Service Bulletin SB1-152019-03-14
SB

SB 622

Lycoming Engines

Issued 2019-03-14

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Slick/Champion Aerospace Service Bulletin SB1-15

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

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 549Engine/Crankshaft Inspection2018-02-09
SB

SB 549

Lycoming Engines

Issued 2018-02-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine/Crankshaft Inspection

Applies to Lycoming O-360

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 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 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 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 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 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 612Oil Level Gage Replacement2016-04-05
SB

SB 612

Lycoming Engines

Issued 2016-04-05

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Level Gage Replacement

Applies to Lycoming O-360

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 411Adapter Kit for Magneto Isolation Drive2015-10-30
SB

SB 411

Lycoming Engines

Issued 2015-10-30

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Adapter Kit for Magneto Isolation Drive

Applies to Lycoming O-360

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 619Hardness Check for Rocker Arm, Part Number LW-150142015-04-09
SB

SB 619

Lycoming Engines

Issued 2015-04-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Hardness Check for Rocker Arm, Part Number LW-15014

Applies to Lycoming O-320Lycoming O-360

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 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 585Incorrect Exhaust Valve Rotator Cap Shipped with Cylinder Kits P/N 05K21119, 05K21121, and 05K211222009-03-17
SB

SB 585

Lycoming Engines

Issued 2009-03-17

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Incorrect Exhaust Valve Rotator Cap Shipped with Cylinder Kits P/N 05K21119, 05K21121, and 05K21122

Applies to Lycoming O-320Lycoming O-360

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 564Inspection of Suction Screen Length2008-08-22
SB

SB 564

Lycoming Engines

Issued 2008-08-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection of Suction Screen Length

Applies to Lycoming O-360

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 446The Use of Lycoming LW-16702 Oil Additive2008-07-18
SB

SB 446

Lycoming Engines

Issued 2008-07-18

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

The Use of Lycoming LW-16702 Oil Additive

Applies to Lycoming O-320Lycoming O-360

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 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 530Application of Protective Coating on Crankshaft2004-11-22
SB

SB 530

Lycoming Engines

Issued 2004-11-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Application of Protective Coating on Crankshaft

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

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 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 505BInspection of Crankshaft I.D. for Corrosion1997-12-01
SB

SB 505B

Lycoming Engines

Issued 1997-12-01

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection of Crankshaft I.D. for Corrosion

Applies to Lycoming O-320Lycoming O-360

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)

Service Instructions

142 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)
SBSI 1009BFTime Between Overhaul (TBO) Schedules2026-07-20
SI

SI 1009BF

Lycoming Engines

Issued 2026-07-20

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Time Between Overhaul (TBO) Schedules

Applies to Lycoming O-320Lycoming O-360

Source: Lycoming Engines, retrieved 2026-08-13 · 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 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 1586Oil Filter Base Bypass Spring Replacement2021-12-21
SI

SI 1586

Lycoming Engines

Issued 2021-12-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Filter Base Bypass Spring Replacement

Applies to Lycoming O-360

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 1582Fuel Injector Replacement2021-11-22
SI

SI 1582

Lycoming Engines

Issued 2021-11-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Fuel Injector Replacement

Applies to Lycoming O-360

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 1573Lycoming TEO-540 Engine Series Approved Engine Configurations2021-11-22
SI

SI 1573

Lycoming Engines

Issued 2021-11-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming TEO-540 Engine Series Approved Engine Configurations

Applies to Lycoming O-360

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 1280Rotator Type Intake Valves2021-07-21
SI

SI 1280

Lycoming Engines

Issued 2021-07-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Rotator Type Intake Valves

Applies to Lycoming IO-720Lycoming O-360

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 1415New Turbocharger Mounting Hardware2019-03-22
SI

SI 1415

Lycoming Engines

Issued 2019-03-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

New Turbocharger Mounting Hardware

Applies to Lycoming O-360

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 1498Recommended Engine Procedures for Purge of Vapor During Ground Operations2019-01-08
SI

SI 1498

Lycoming Engines

Issued 2019-01-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Recommended Engine Procedures for Purge of Vapor During Ground Operations

Applies to Lycoming O-360

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)
SBSI 1572Plug Replacement of Vapor Return Fitting on Piper installation of IO-360- B4A2018-08-02
SI

SI 1572

Lycoming Engines

Issued 2018-08-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Plug Replacement of Vapor Return Fitting on Piper installation of IO-360- B4A

Applies to Lycoming O-360

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 1502Installation of Inverted Flow Divider2017-08-21
SI

SI 1502

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Installation of Inverted Flow Divider

Applies to Lycoming O-360

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 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 1506Replacement of Impulse Coupling Magnetos on Four-Cylinder Engines2016-06-28
SI

SI 1506

Lycoming Engines

Issued 2016-06-28

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement of Impulse Coupling Magnetos on Four-Cylinder Engines

Applies to Lycoming O-320Lycoming O-360

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)
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 1406Crankcase Parts for Use with Large-Diameter Hydraulic Lifters2014-09-09
SI

SI 1406

Lycoming Engines

Issued 2014-09-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Crankcase Parts for Use with Large-Diameter Hydraulic Lifters

Applies to Lycoming O-320Lycoming O-360

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)
SBSL 261Alternate Carburetor2014-04-23
SI

SL 261

Lycoming Engines

Issued 2014-04-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Alternate Carburetor

Applies to Lycoming O-360

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 259Product Improvements on Lycoming Carburetor P/N 61C260512014-01-23
SI

SL 259

Lycoming Engines

Issued 2014-01-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Product Improvements on Lycoming Carburetor P/N 61C26051

Applies to Lycoming O-360

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 1545Expanded Clearance in Crankcase Nose2012-10-02
SI

SI 1545

Lycoming Engines

Issued 2012-10-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Expanded Clearance in Crankcase Nose

Applies to Lycoming O-320Lycoming O-360

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 1497Engine Procedures for Flight Training Operations2011-04-12
SI

SI 1497

Lycoming Engines

Issued 2011-04-12

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Procedures for Flight Training Operations

Applies to Lycoming O-360

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 1489Fuel Manifold Spring Change2011-03-09
SI

SI 1489

Lycoming Engines

Issued 2011-03-09

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Fuel Manifold Spring Change

Applies to Lycoming O-360

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 1508Dual Magneto Attachment2011-02-10
SI

SI 1508

Lycoming Engines

Issued 2011-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Dual Magneto Attachment

Applies to Lycoming O-360

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 1436Adapter Kit for Magneto Isolation Drive2010-09-29
SI

SI 1436

Lycoming Engines

Issued 2010-09-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Adapter Kit for Magneto Isolation Drive

Applies to Lycoming O-360

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 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 1524Alternator Bracket Kit for 130A Alternators2009-02-23
SI

SI 1524

Lycoming Engines

Issued 2009-02-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Alternator Bracket Kit for 130A Alternators

Applies to Lycoming O-360

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 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 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)
SBSI 1105Periodic Inspection of Generator/Alternator Mounting Brackets2006-05-05
SI

SI 1105

Lycoming Engines

Issued 2006-05-05

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Periodic Inspection of Generator/Alternator Mounting Brackets

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

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 1511Inspection of "PID" Stamped Crankshafts2005-05-26
SI

SI 1511

Lycoming Engines

Issued 2005-05-26

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection of "PID" Stamped Crankshafts

Applies to Lycoming O-320Lycoming O-360

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 1510Adapter Kit for Magneto Isolation Drive2004-04-22
SI

SI 1510

Lycoming Engines

Issued 2004-04-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Adapter Kit for Magneto Isolation Drive

Applies to Lycoming O-360

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 12 ADs and 219 SBs from primary sources. The FAA may have issued additional directives for this engine that are not yet included.

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