Lycoming O-540 Airworthiness Directives

Every AD in the library whose text names the Lycoming O-540, of which 5,816 are registered in the US.

23 not superseded, 2 of them with a repeat action. 29 listed in all, newest published August 28, 2026.

Published sinceHide 6 supersededOnly repeat actions23 of 29

2026-04-11Requires the actions in AD 2024-21-02 and expands the applicabilityEngineSupersedes 2024-21-02Repeat actionMar 4, 2026
2002-12-07Textron Lycoming Reciprocating EnginesEngineSupersedes 2000-18-53Repeat actionJun 18, 2002
2026-17-10Requires 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...Lycoming Engines Engines · EngineAug 28, 2026
2012-19-01Lycoming Engines Reciprocating EnginesEngineSupersedes 2006-20-09Sep 19, 2012
2011-13-03Requires inspecting certain Lycoming and TCM reciprocating engines with certain Hartzell Engine Technologies, LLC (HET) turbochargers installed, and disassembly and cleaning of the turbocharger center housing and...Lycoming Engines (Type Certificate Previously Held by Textron Lycoming) and Teledyne Continental Motors (TCM) Turbocharged Reciprocating Engines · EngineJun 28, 2011
2005-19-11Requires replacing certain crankshaftsLycoming Engines (Formerly Textron Lycoming) AEIO-360, IO-360, O-360, LIO-360, LO-360, AEIO-540, IO-540, O-540, and TIO-540 Series Reciprocating Engines · EngineSep 16, 2005
2004-05-24Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating EnginesEngineSupersedes 2002-23-06Mar 15, 2004
99-04-04Textron Lycoming Reciprocating Engines IO-540 and O-540 Engines Equipped With Slick Aircraft Products MagnetosEngineFeb 10, 1999
99-03-05Textron Lycoming Model O-540-F1B5 Reciprocating EnginesEngineFeb 3, 1999
97-15-11Avco Lycoming and Textron Lycoming Reciprocating EnginesEngineSupersedes 97-01-03Jul 28, 1997
96-09-10Lycoming Engines EnginesEngineSupersedes 81-18-04 R2Jun 10, 1996
95-26-02Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineJan 9, 1996
95-07-01Requires removal prior to further flight of suspect unapproved connecting rod bolts and replacement with serviceable connecting rod boltsLycoming Engines, Textron Lycoming, AVCO Corporation Engines · EngineMar 28, 1995
92-12-05Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineJul 10, 1992
87-10-06 R1Lycoming Engines EnginesEngineSep 1, 1989
75-08-09Lycoming Engines EnginesEngineAug 18, 1977
73-23-01Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineJan 13, 1977
66-06-03Lycoming Engines, Textron Lycoming, AVCO Corporation EnginesEngineJan 16, 1969
66-20-04Lycoming Engines EnginesEngineAug 27, 1966
66-14-03Lycoming Engines EnginesEngineJul 9, 1966
64-16-05Lycoming Engines EnginesEngineJul 10, 1964
63-14-03Lycoming Engines EnginesEngineJul 6, 1963
59-10-07Lycoming Engines EnginesEngine1959

Listed by the model designations in each AD's text. An AD written for a part number, or for "all" engines of a maker, may name no model and so not appear here: search the library for the part or the maker as well.