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Engine model

Lycoming IO-720

Lycoming Engines

Airworthiness Directives
5
Manufacturer bulletins
13740 Service Bulletins, 97 Service Instructions
Last live check
2026-10-035 of 5 re-checked, oldest 2026-10-02

Printed from https://aircraftdirectives.com/engine/lycoming-io-720 · 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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What directives and bulletins apply to the Lycoming IO-720

The FAA has published 5 Airworthiness Directives that name the Lycoming IO-720 (Lycoming Engines), the earliest in 1995 and the newest on 2022-07-29. 137 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 2012-19-01 Airworthiness Directives; Lycoming Engines Reciprocating Engines 2012-09-19
  3. AD 2011-18-09 Airworthiness Directives; Lycoming Engines Model IO-720-A1B Reciprocating Engines 2011-09-14

See all 5 directives

Bulletins that matter

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

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

Airworthiness Directives

5 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

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 2011-18-09Lycoming Engines Model IO-720-A1B Reciprocating Engines2011-09-29Active
AD

2011-18-09

FR doc 2011-22244 · 76 FR 56637

AD 2011-18-09Published 2011-09-14Effective 2011-09-29

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 Model IO-720-A1B Reciprocating Engines

Requires a crankshaft inspection for certain parts that may be installed.

Full official abstract

Airworthiness Directives; Lycoming Engines Model IO-720-A1B Reciprocating Engines

We are adopting a new airworthiness directive (AD) for certain model IO-720-A1B Lycoming Engines reciprocating engines. This AD requires a crankshaft inspection for certain parts that may be installed. This AD was prompted by the failure of a crankshaft due to incorrect parts installed. We are issuing this AD to prevent engine crankshaft failure and damage to the airplane.

Source: Federal Register document 2011-22244, retrieved 2026-08-16 · checked against the live Federal Register record on 2026-10-03

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 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 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

40 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 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 653Hartzell Engine Tech (HET) Alert Service Bulletin (ASB) No. 0982023-09-13
SB

SB 653

Lycoming Engines

Issued 2023-09-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

Applies to Lycoming IO-720Lycoming O-540

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

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

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

SB 590

Lycoming Engines

Issued 2009-11-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

SB 581

Lycoming Engines

Issued 2008-11-19

Manufacturer document

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

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

SB 584

Lycoming Engines

Issued 2008-10-17

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

SB 582

Lycoming Engines

Issued 2008-10-10

Manufacturer document

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

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

Service Instructions

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

SI 1485

Lycoming Engines

Issued 2026-07-30

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Exhaust Valve and Guide Identification Procedure

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

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

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

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

SL L234

Lycoming Engines

Issued 2026-06-25

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Tool Rental Program

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

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

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

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

SI 1154

Lycoming Engines

Issued 2026-05-18

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

FAA-Approved Starters and Alternators

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

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

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

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

SI 1575

Lycoming Engines

Issued 2026-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

New Connecting Rod Bushing

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

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

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

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

SI 1014

Lycoming Engines

Issued 2026-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lubricating Oil Recommendations

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

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

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

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

SI 1042

Lycoming Engines

Issued 2026-01-28

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

APPROVED SPARK PLUGS

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

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

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

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

SI 1481

Lycoming Engines

Issued 2025-11-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Factory Engine Preservation

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 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 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 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 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 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)
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)
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 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 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 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 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 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 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 258Part Number Supersedure for External Retaining Ring2013-08-27
SI

SL 258

Lycoming Engines

Issued 2013-08-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Part Number Supersedure for External Retaining Ring

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSL 254Lycoming Model Designation for all Carburetors2013-04-15
SI

SL 254

Lycoming Engines

Issued 2013-04-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Model Designation for all Carburetors

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1546Specific Requirements for Installation and Removal of Electrical Lead on Hartzell Engine Technologies, LLC Starters2012-10-04
SI

SI 1546

Lycoming Engines

Issued 2012-10-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Specific Requirements for Installation and Removal of Electrical Lead on Hartzell Engine Technologies, LLC Starters

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1549Notification of Approved Fuel Pump Plunger P/N 23D267772012-06-27
SI

SI 1549

Lycoming Engines

Issued 2012-06-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Notification of Approved Fuel Pump Plunger P/N 23D26777

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1256Valve Guides For Service Use2012-04-05
SI

SI 1256

Lycoming Engines

Issued 2012-04-05

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Valve Guides For Service Use

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1458Connecting Rod Bolts2012-03-06
SI

SI 1458

Lycoming Engines

Issued 2012-03-06

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Connecting Rod Bolts

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1414Bendix Service Bulletin No. RS­77, Rev. 22012-02-27
SI

SI 1414

Lycoming Engines

Issued 2012-02-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Bendix Service Bulletin No. RS­77, Rev. 2

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1543Notification of Approved Tappet P/N 15B262622012-02-23
SI

SI 1543

Lycoming Engines

Issued 2012-02-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Notification of Approved Tappet P/N 15B26262

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1457Optional Remote­Mounted Oil Filter Kits2012-02-01
SI

SI 1457

Lycoming Engines

Issued 2012-02-01

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Optional Remote­Mounted Oil Filter Kits

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1143Counterweight Bushing Inspection, Replacement, and Special Tooling Upgrades2011-11-10
SI

SI 1143

Lycoming Engines

Issued 2011-11-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Counterweight Bushing Inspection, Replacement, and Special Tooling Upgrades

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1535Counterweight and Roller Removal, Inspection, and Installation2011-10-31
SI

SI 1535

Lycoming Engines

Issued 2011-10-31

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Counterweight and Roller Removal, Inspection, and Installation

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSL 220Wide Deck Cylinder Configuration on Lycoming Engines2011-08-02
SI

SL 220

Lycoming Engines

Issued 2011-08-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Wide Deck Cylinder Configuration on Lycoming Engines

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSL 250Lycoming Engines Exchange Engine Core Policy2011-07-29
SI

SL 250

Lycoming Engines

Issued 2011-07-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Engines Exchange Engine Core Policy

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1484Installation Torque for Fuel Metering Device, Carburetor, Fuel Injector Servo or "AN" Fuel Pump Hold Down Nuts2011-03-29
SI

SI 1484

Lycoming Engines

Issued 2011-03-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Installation Torque for Fuel Metering Device, Carburetor, Fuel Injector Servo or "AN" Fuel Pump Hold Down Nuts

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 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 1530Engine Inspection in Particulate-Laden Environments2011-02-04
SI

SI 1530

Lycoming Engines

Issued 2011-02-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Inspection in Particulate-Laden Environments

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1534Service Recommendations for Long-Term Storage of Engines That Use Automotive Fuel2011-01-27
SI

SI 1534

Lycoming Engines

Issued 2011-01-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Service Recommendations for Long-Term Storage of Engines That Use Automotive Fuel

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1427Lycoming Reciprocating Engine Break-In and Oil Consumption2010-12-29
SI

SI 1427

Lycoming Engines

Issued 2010-12-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Reciprocating Engine Break-In and Oil Consumption

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1483Valve Leak Check with Engine Cylinder Removed2010-12-21
SI

SI 1483

Lycoming Engines

Issued 2010-12-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Valve Leak Check with Engine Cylinder Removed

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSL 251Connecting Rod Bolt Marking2010-11-23
SI

SL 251

Lycoming Engines

Issued 2010-11-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Connecting Rod Bolt Marking

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1453Procedure to Replace Oil Filter Converter Plate Gasket2010-09-24
SI

SI 1453

Lycoming Engines

Issued 2010-09-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Procedure to Replace Oil Filter Converter Plate Gasket

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 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 1528Aircraft Engine Starter Recommendations2009-12-15
SI

SI 1528

Lycoming Engines

Issued 2009-12-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Aircraft Engine Starter Recommendations

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1424Installation Procedure for P/N 15B26066 Hydraulic Tappet/Plunger Assemblies2009-12-15
SI

SI 1424

Lycoming Engines

Issued 2009-12-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Installation Procedure for P/N 15B26066 Hydraulic Tappet/Plunger Assemblies

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1267Piston Pin Plug Usage2009-08-28
SI

SI 1267

Lycoming Engines

Issued 2009-08-28

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Piston Pin Plug Usage

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSL 240Part Numbers Identified by Lycoming with -70 or -85 Suffix2009-05-27
SI

SL 240

Lycoming Engines

Issued 2009-05-27

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Part Numbers Identified by Lycoming with -70 or -85 Suffix

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1492Piston Pin Plug Wear Inspection2009-03-20
SI

SI 1492

Lycoming Engines

Issued 2009-03-20

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Piston Pin Plug Wear Inspection

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1409Lycoming Engines P/N LW-16702, Oil Additive2009-02-20
SI

SI 1409

Lycoming Engines

Issued 2009-02-20

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Engines P/N LW-16702, Oil Additive

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 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 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 1343Set Screw for Propeller Governor Idler Shaft2007-06-15
SI

SI 1343

Lycoming Engines

Issued 2007-06-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Set Screw for Propeller Governor Idler Shaft

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSL 221Warranty Repair of Precision Airmotive Corporation Fuel Control Products2007-06-15
SI

SL 221

Lycoming Engines

Issued 2007-06-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Warranty Repair of Precision Airmotive Corporation Fuel Control Products

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1308Pressurized Magneto Pressure Test2007-02-02
SI

SI 1308

Lycoming Engines

Issued 2007-02-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Pressurized Magneto Pressure Test

Applies to Lycoming IO-720Lycoming O-540

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 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 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)
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 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 5 ADs and 137 SBs from primary sources. The FAA may have issued additional directives for this engine that are not yet included.

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