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Engine model

Lycoming O-235

Lycoming Engines

Airworthiness Directives
2
Manufacturer bulletins
12436 Service Bulletins, 88 Service Instructions
Last live check
2026-10-032 of 2 re-checked, oldest 2026-10-02

Printed from https://aircraftdirectives.com/engine/lycoming-o-235 · 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 O-235

The FAA has published 2 Airworthiness Directives that name the Lycoming O-235 (Lycoming Engines), the earliest in 1996 and the newest on 2026-08-28. 124 manufacturer bulletins from Lycoming Engines name this engine too.

Newest

  1. AD 2026-17-10 Airworthiness Directives; Lycoming Engines 2026-08-28
  2. AD 95-03-10 Airworthiness Directives; Textron Lycoming O-235 Series Reciprocating Engines 1996-01-09

See all 2 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

2 records
ADAD 2026-17-10Lycoming Engines2026-09-14Active
AD

2026-17-10

FR doc 2026-17584 · 91 FR 55451

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

FAA rule - 14 CFR 39

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

Lycoming Engines

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

Full official abstract

Airworthiness Directives; Lycoming Engines

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

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

View on Federal Register (opens in a new tab) Search DRS manually for AD 2026-17-10 (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)
ADAD 95-03-10Textron Lycoming O-235 Series Reciprocating Engines1996-01-24Active
AD

95-03-10

FR doc 96-272 · 61 FR 625

AD 95-03-10Published 1996-01-09Effective 1996-01-24

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.

Textron Lycoming O-235 Series Reciprocating Engines

Requires a one- time inspection within the next 5 hours time in service to determine the part number (P/N) and revision letter of the push rod installed on the engine.

Full official abstract

Airworthiness Directives; Textron Lycoming O-235 Series Reciprocating Engines

This document publishes in the Federal Register an amendment adopting airworthiness directive (AD) 95-03-10 that was sent previously to all known U.S. owners and operators of Textron Lycoming O-235 series reciprocating engines by individual letters. This AD requires a one- time inspection within the next 5 hours time in service to determine the part number (P/N) and revision letter of the push rod installed on the engine. All push rods with P/N 73806 and revision letters ``V'' or ``W'' must be replaced with serviceable parts. This amendment is prompted by reports of several failures of push rods. The actions specified by this AD are intended to prevent engine roughness and power loss, which could result in loss of the aircraft.

Source: Federal Register document 96-272, retrieved 2026-08-15 · checked against the live Federal Register record on 2026-10-02

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

Service Bulletins

36 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 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 660Reprint of Slick/Champion Aerospace Service Bulletin SB1-24A2024-09-20
SB

SB 660

Lycoming Engines

Issued 2024-09-20

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSB 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 642Incorrect Piston and Ring Combination2021-06-17
SB

SB 642

Lycoming Engines

Issued 2021-06-17

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Incorrect Piston and Ring Combination

Applies to Lycoming O-235

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

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

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

SB 369

Lycoming Engines

Issued 2020-04-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

ENGINE INSPECTION AFTER OVERSPEED

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

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

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

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

SB 637

Lycoming Engines

Issued 2019-03-14

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Slick/Champion Aerospace Service Bulletin SB1-19

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSB 622Reprint of Slick/Champion Aerospace Service Bulletin SB1-152019-03-14
SB

SB 622

Lycoming Engines

Issued 2019-03-14

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Slick/Champion Aerospace Service Bulletin SB1-15

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

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

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

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

SB 524

Lycoming Engines

Issued 2017-08-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement of Oil Pump Impellers Sintered Iron and Aluminum

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

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

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

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

SB 632

Lycoming Engines

Issued 2017-08-03

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Identification of Connecting Rods with Non-Conforming Small End Bushings

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

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

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

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

SB 480F

Lycoming Engines

Issued 2017-05-25

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

SB 401

Lycoming Engines

Issued 2017-05-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Recommended Guidance After a Lightning Strike

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

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

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

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

SB 516

Lycoming Engines

Issued 2016-09-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

SB 518

Lycoming Engines

Issued 2016-08-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection of Thermostatic Oil Cooler Bypass Valves

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

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

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

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

SB 366

Lycoming Engines

Issued 2016-06-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Carburetor Throttle Body Screw Inspection

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

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

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

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

SB 623

Lycoming Engines

Issued 2016-02-03

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Hartzell Engine Technologies

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

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

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

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

SB 576

Lycoming Engines

Issued 2007-09-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Reprint of Teledyne Continental Ignition Systems Service Bulletin No. SB633A

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSB 572Missing Oil Passage Hole at Idler Shaft Location2006-10-30
SB

SB 572

Lycoming Engines

Issued 2006-10-30

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Missing Oil Passage Hole at Idler Shaft Location

Applies to Lycoming O-235

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

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

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

SB 548

Lycoming Engines

Issued 2005-08-31

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Diaphragm-Type Fuel Pump Inspection/Replacement

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

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

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

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

SB 388

Lycoming Engines

Issued 2004-11-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Procedure to Determine Exhaust Valve and Guide Condition

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSB 530Application of Protective Coating on Crankshaft2004-11-22
SB

SB 530

Lycoming Engines

Issued 2004-11-22

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Application of Protective Coating on Crankshaft

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

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

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

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

SB 559

Lycoming Engines

Issued 2004-03-23

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

88 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 1366Repair Procedure for Worn Rocker Shaft Bushing Hole2026-02-10
SI

SI 1366

Lycoming Engines

Issued 2026-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Repair Procedure for Worn Rocker Shaft Bushing Hole

Applies to Lycoming O-235

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

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

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

SI 1014

Lycoming Engines

Issued 2026-02-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lubricating Oil Recommendations

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

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

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

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

SI 1042

Lycoming Engines

Issued 2026-01-28

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

APPROVED SPARK PLUGS

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

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

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

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

SI 1481

Lycoming Engines

Issued 2025-11-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Factory Engine Preservation

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

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

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

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

SI 1443

Lycoming Engines

Issued 2025-11-18

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

SI 1129

Lycoming Engines

Issued 2025-09-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Methods of Checking DC Alternator and Generator Belt Tension

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

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

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

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

SI 1080

Lycoming Engines

Issued 2025-09-24

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Required Maintenance Items for Specific Components

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

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

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

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

SI 1304

Lycoming Engines

Issued 2025-08-26

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Data Plate (Identification Plate) Replacement

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

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

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

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

SI 1037AA

Lycoming Engines

Issued 2025-07-29

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1594O-235 Crankcase Inspection2025-07-15
SI

SI 1594

Lycoming Engines

Issued 2025-07-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

O-235 Crankcase Inspection

Applies to Lycoming O-235

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

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject 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 1587Reprint of AVStar Service Information Letter No. AFS-SIL-032022-02-03
SI

SI 1587

Lycoming Engines

Issued 2022-02-03

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

SI 1569

Lycoming Engines

Issued 2021-04-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 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)
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 1504Cylinder Assembly Replacement on O-235 Engines Operated Under DGAC Authority2017-08-21
SI

SI 1504

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Cylinder Assembly Replacement on O-235 Engines Operated Under DGAC Authority

Applies to Lycoming O-235

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

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

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

SI 1191

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Cylinder Compression

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

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

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

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

SI 1435

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

SI 1341

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Oil Pump Idler Shaft Lubrication

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

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

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

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

SI 1047

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Inspection and Reconditioning Procedures for Nitride Hardened Steel Cylinders

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

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

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

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

SL 180

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Preservation for Active and Stored Aircraft

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

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

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

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

SL 197

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Recommendations to Avoid Valve Sticking

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

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

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

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

SL 185

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

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

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

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

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

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

SL 192

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Spark Plug Fouling

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

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

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

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

SL 171

Lycoming Engines

Issued 2017-08-21

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

General Aspects of Spectrometric Oil Analysis

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

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

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

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

SI 1029

Lycoming Engines

Issued 2017-08-04

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Tightening Procedures for Crankcase Thru-Studs and Bolts

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

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

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

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

SI 1285

Lycoming Engines

Issued 2017-07-19

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Non-Destructive Testing of Lycoming Engine Parts

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

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

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

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

SI 1425

Lycoming Engines

Issued 2017-05-08

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Suggested Maintenance Procedures to Reduce the Possibility of Valve Sticking

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

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

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

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

SI 1565

Lycoming Engines

Issued 2017-05-03

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement Thermostatic Oil Cooler Bypass Valves

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

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

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

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

SL 255

Lycoming Engines

Issued 2016-05-13

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Approved Diaphragm-Type Fuel Pump

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

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

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

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

SI 1523

Lycoming Engines

Issued 2016-03-16

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Lycoming Engines’ Carburetor Manufacturer Cross-References

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 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)
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 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 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 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 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)
SBSL 248O-235 Crankcase Design Upgrade2011-01-14
SI

SL 248

Lycoming Engines

Issued 2011-01-14

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

O-235 Crankcase Design Upgrade

Applies to Lycoming O-235

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

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, subject 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 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 1246Engine Conversion For Use of 100/130 or 100LL Grade Fuel2009-12-15
SI

SI 1246

Lycoming Engines

Issued 2009-12-15

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Engine Conversion For Use of 100/130 or 100LL Grade Fuel

Applies to Lycoming O-235

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

A manufacturer bulletin is not an FAA rule; applicable ADs, binding Airworthiness Limitations or other governing requirements can require compliance; our bulletin content comprises number, title, date and applicability, with manufacturer attribution and a source link; the manufacturer’s document controls over our Record, 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)
SBSL 245Special Service Publication No. SSP-567, "Camshaft Regrinding"2007-11-02
SI

SL 245

Lycoming Engines

Issued 2007-11-02

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Special Service Publication No. SSP-567, "Camshaft Regrinding"

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1148Use of Carburetor Heat Control2007-10-12
SI

SI 1148

Lycoming Engines

Issued 2007-10-12

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Use of Carburetor Heat Control

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

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

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

View on Lycoming Engines' site (opens in a new tab)
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 1105Periodic Inspection of Generator/Alternator Mounting Brackets2006-05-05
SI

SI 1105

Lycoming Engines

Issued 2006-05-05

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Periodic Inspection of Generator/Alternator Mounting Brackets

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSL 173Slick Aircraft Products Service Bulletin No. SB2-80C2006-03-10
SI

SL 173

Lycoming Engines

Issued 2006-03-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Slick Aircraft Products Service Bulletin No. SB2-80C

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 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 1462Propeller Oil Control Leak Test Procedure2003-07-10
SI

SI 1462

Lycoming Engines

Issued 2003-07-10

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Propeller Oil Control Leak Test Procedure

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

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

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

View on Lycoming Engines' site (opens in a new tab)
SBSI 1509Replacement of all P/N STD 1409 Nuts with P/N STD-2249 Nuts2003-04-25
SI

SI 1509

Lycoming Engines

Issued 2003-04-25

Manufacturer document

Manufacturer document; legal obligations depend on applicable requirements.

Replacement of all P/N STD 1409 Nuts with P/N STD-2249 Nuts

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

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

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

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

This page indexes 2 ADs and 124 SBs from primary sources. The FAA may have issued additional directives for this engine that are not yet included.

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