AD 91-08-07
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | TIO-360-A1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-360-A1B | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-360-A3B6 | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-360-C1A6D | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | LTIO-540-F2BD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | LTIO-540-J2B | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | LTIO-540-J2BD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | LTIO-540-K1AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | LTIO-540-N2BD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | LTIO-540-R2AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | LTIO-540-U2A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | LTIO-540-V2AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | LTIO-540-W2A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-A1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-A1B | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-A1C | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-A2A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-A2B | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-A2C | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-AA1AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-AB1AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-AB1BD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-AE2A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-AF1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-AF1B | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-AG1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-AH1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-C1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-E1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-F2BD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-G1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-H1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-J2B | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-J2BD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-K1AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-N2BD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-R2AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-S1AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-T2AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-U2A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-V2AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-540-W2A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-541-A1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-541-E1A4 | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-541-E1B4 | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-541-E1C4 | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIO-541-E1D4 | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIGO-541-B1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIGO-541-C1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIGO-541-D1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIGO-541-D1B | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIGO-541-E1A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIGO-541-G1AD | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
| engine | Lycoming Engines | TIVO-540-A2A | TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines |
Unsafe Condition
Engine power loss and possible loss of the aircraft due to fuel leakage from the fuel pump vent hose fitting or improper fuel pump vent restrictor fitting with orifice diameter out of limits or lacking the 'R' code letter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform a fuel leak check at the fuel pump vent hose fitting, including disconnecting the hose, activating the boost pump, and inspecting for leakage. Replace leaking fuel pumps and recheck after replacement. Inspect and replace the fuel pump vent restrictor fitting if the orifice diameter is outside .014-.020 inch or lacks the 'R' code letter, using Loctite sealant on threads. Ensure correct orientation during reinstallation.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 15 hours in service for paragraph (a) and within the next 50 hours in service for paragraph (b), after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Textron Lycoming TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series engines with specified serial ranges; overhauled/remanufactured engines shipped before November 15, 1990; engines modified with turbochargers and induction-vented fuel pump vents.
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
Fuel Pump
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_91-08-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 91-08-07 Document Type: AD Final Rules Docket Number: 91-ANE-08 Subject Heading: TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-5...Show more Subject: Fuel Pump Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/06/1991 Make: Lycoming Engines Model: TIO-360-A1A | TIO-360-A1B | TIO-360-A3B6 | TIO-360-C1A6D | LTIO-540-F2BD | LTIO-540-J2B | LTIO-540-J...Show more Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 91-08-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 91-ANE-08 AMENDMENT: 39-6962 AD NUMBER: 91-08-07 SUBJECT HEADING: TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines ACTION: SUMMARY: DATES: Effective May 6, 1991. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 91-08-07 TEXTRON LYCOMING: Amendment 39-6962. Docket No. 91-ANE-08. Applicability: TIO-360 Series engines with serial numbers up to L-215-64A inclusive; TIO-540 Series engines with serial numbers up to L-9245-61/61A inclusive, except TIO-540-AE2A engines for which the requirements of AD 89-15-10 are met; LTIO-540 Series engines with serial numbers up to L-2911-68A inclusive; TIGO-541 Series engines with serial numbers up to L-780-62 inclusive; all TIO-541 Series engines; and all TIVO-540 Series engines. Also applies to overhauled and remanufactured engines of these models shipped from the factory prior to November 15, 1990, and to any Textron Lycoming engine that has been modified to use a turbocharger and that has the fuel pump vent vented to the induction system. Compliance: Required within the next 15 hours in service for paragraph (a) and within the next 50 hours in service for paragraph (b), after the effective date of this AD, unless already accomplished. To prevent engine power loss and possible loss of the aircraft, accomplish the following: (a) Perform a fuel leak check at the fuel pump vent hose fitting as follows: (1) Disconnect the fuel pump vent hose at the engine fuel pump. Then proceed to turn on the aircraft boost pump and visually inspect for any fuel draining out from the engine pump vent port. (2) Prior to further flight, remove and replace with a serviceable pump, engine fuel pumps which exhibit leakage. Repeat the leak check following pump replacement to verify no fuel is passing through the fuel pump vent port. (3) Reconnect the fuel pump vent hose at the engine fuel pump. (b) Inspect and replace if necessary, the fuel pump vent restrictor fitting as follows: (1) Remove fitting from the pump vent port and measure the orifice opening using an appropriate size wire gauge or drill bit. The orifice diameter must be within .014-.020 inch and the fitting must have the code letter "R" impression stamped on a flat surface. (2) Prior to further flight, replace any restrictor fitting that has an orifice diameter out of limits, or if no restrictor orifice exists. Install a new or serviceable restrictor fitting with a proper size orifice, and identified with the letter "R", using Loctite hydraulic sealant or equivalent on the pipe threads. (3) Ensure that the orientation of the reinstalled fitting is the same as the original fitting. (4) Reconnect the pump vent line. NOTE: Textron Lycoming Service Bulletin Nos. 494 and 497 and Service Instruction No. 1446 pertain to this subject. Fuel pump vent fittings supplied by Textron Lycoming with the proper size orifice are identified by the letter "R" stamped on each fitting. Engine Models TIO-541 and TIVO-540 series are not specified in the service bulletins, for these engines the engine driven pump and vent fitting were furnished by the aircraft manufacturer. (c) Aircraft may be ferried in accordance with the provisions of Federal Aviation Regulations 21.197 and 21.199 to a base where the AD can be accomplished. (d) Upon submission of substantiating data by an owner or operator through an FAA Inspector (maintenance, avionics, or operations, as appropriate), an alternate method of compliance with the requirements of this AD or adjustments to the compliance schedule specified in this AD may be approved by the Manager, New York Aircraft Certification Office, Engine & Propeller Directorate, Aircraft Certification Service, FAA, New England Region, Room 202, 181 South Franklin Avenue, Valley Stream, New York 11581. All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to Textron Lycoming/Subsidiary of Textron Inc., 652 Oliver Street, Williamsport, Pennsylvania 17701. This information may be examined at the FAA, New England Region, Office of the Assistant Chief Counsel, Room 311, 12 New England Executive Park, Burlington, Massachusetts. This amendment becomes effective on May 6, 1991. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_91-08-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 91-08-07 Document Type: AD Final Rules Docket Number: 91-ANE-08 Subject Heading: TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-5...Show more Subject: Fuel Pump Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 05/06/1991 Make: Lycoming Engines Model: TIO-360-A1A | TIO-360-A1B | TIO-360-A3B6 | TIO-360-C1A6D | LTIO-540-F2BD | LTIO-540-J2B | LTIO-540-J...Show more Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: Updated RGL applicability to match AD applicability; CAR C-11-185 AIRWORTHINESS DIRECTIVES FINAL RULES: 91-08-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: 91-ANE-08 AMENDMENT: 39-6962 AD NUMBER: 91-08-07 SUBJECT HEADING: TEXTRON LYCOMING Model TIO-360, TIO-540, TIO-360, TIO-540, LTIO-540, TIGO-541, TIO-541, and TIVO-540 Series Engines ACTION: SUMMARY: DATES: Effective May 6, 1991. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 91-08-07 TEXTRON LYCOMING: Amendment 39-6962. Docket No. 91-ANE-08. Applicability: TIO-360 Series engines with serial numbers up to L-215-64A inclusive; TIO-540 Series engines with serial numbers up to L-9245-61/61A inclusive, except TIO-540-AE2A engines for which the requirements of AD 89-15-10 are met; LTIO-540 Series engines with serial numbers up to L-2911-68A inclusive; TIGO-541 Series engines with serial numbers up to L-780-62 inclusive; all TIO-541 Series engines; and all TIVO-540 Series engines. Also applies to overhauled and remanufactured engines of these models shipped from the factory prior to November 15, 1990, and to any Textron Lycoming engine that has been modified to use a turbocharger and that has the fuel pump vent vented to the induction system. Compliance: Required within the next 15 hours in service for paragraph (a) and within the next 50 hours in service for paragraph (b), after the effective date of this AD, unless already accomplished. To prevent engine power loss and possible loss of the aircraft, accomplish the following: (a) Perform a fuel leak check at the fuel pump vent hose fitting as follows: (1) Disconnect the fuel pump vent hose at the engine fuel pump. Then proceed to turn on the aircraft boost pump and visually inspect for any fuel draining out from the engine pump vent port. (2) Prior to further flight, remove and replace with a serviceable pump, engine fuel pumps which exhibit leakage. Repeat the leak check following pump replacement to verify no fuel is passing through the fuel pump vent port. (3) Reconnect the fuel pump vent hose at the engine fuel pump. (b) Inspect and replace if necessary, the fuel pump vent restrictor fitting as follows: (1) Remove fitting from the pump vent port and measure the orifice opening using an appropriate size wire gauge or drill bit. The orifice diameter must be within .014-.020 inch and the fitting must have the code letter "R" impression stamped on a flat surface. (2) Prior to further flight, replace any restrictor fitting that has an orifice diameter out of limits, or if no restrictor orifice exists. Install a new or serviceable restrictor fitting with a proper size orifice, and identified with the letter "R", using Loctite hydraulic sealant or equivalent on the pipe threads. (3) Ensure that the orientation of the reinstalled fitting is the same as the original fitting. (4) Reconnect the pump vent line. NOTE: Textron Lycoming Service Bulletin Nos. 494 and 497 and Service Instruction No. 1446 pertain to this subject. Fuel pump vent fittings supplied by Textron Lycoming with the proper size orifice are identified by the letter "R" stamped on each fitting. Engine Models TIO-541 and TIVO-540 series are not specified in the service bulletins, for these engines the engine driven pump and vent fitting were furnished by the aircraft manufacturer. (c) Aircraft may be ferried in accordance with the provisions of Federal Aviation Regulations 21.197 and 21.199 to a base where the AD can be accomplished. (d) Upon submission of substantiating data by an owner or operator through an FAA Inspector (maintenance, avionics, or operations, as appropriate), an alternate method of compliance with the requirements of this AD or adjustments to the compliance schedule specified in this AD may be approved by the Manager, New York Aircraft Certification Office, Engine & Propeller Directorate, Aircraft Certification Service, FAA, New England Region, Room 202, 181 South Franklin Avenue, Valley Stream, New York 11581. All persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to Textron Lycoming/Subsidiary of Textron Inc., 652 Oliver Street, Williamsport, Pennsylvania 17701. This information may be examined at the FAA, New England Region, Office of the Assistant Chief Counsel, Room 311, 12 New England Executive Park, Burlington, Massachusetts. This amendment becomes effective on May 6, 1991. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
Related Airworthiness Directives
2026-04-11 Recurring
final ruleAirworthiness Directives; Lycoming Engines
Unsafe Condition: Reports of connecting rod failures, which resulted in uncontained engine failure and in-flight shutdowns.
2024-21-02 Recurring
final ruleAirworthiness Directives; Lycoming Engines
Unsafe Condition: Connecting rod failures, which resulted in uncontained engine failure and in-flight shutdowns (IFSDs), due to degradation of the connecting rod small end bushings.
2022-16-03
final ruleAirworthiness Directives; Continental Aerospace Technologies, Inc., Lycoming Engines, and Textron Lycoming/Subsidiary of Textron, Inc. Reciprocating Engines
Unsafe Condition: A manufacturing quality escape of improperly lubricated roller bearings installed in certain magnetos, which may result in overheating and magneto seizure.
2015-19-07
final ruleAirworthiness Directives; Lycoming Engines Fuel Injected Reciprocating Engines
Unsafe Condition: Failure of the fuel injector fuel lines, which could lead to uncontrolled engine fire, engine damage, and damage to the airplane.