Supersedes Service Bulletin No. 446D July 18, 2008 MODELS AFFECTED Lycoming O­320­H, O­360­E, LO­360­E, TO­360­E and LTO­360­E series engines. TIME OF COMPLIANCE At next engine oil change and at every 50 hours and at every oil change thereafter. Laboratory tests indicate that occasionally when the engine is first started, for a very brief interval there is insufficient residual oil between the...

DATE: February 15, 2008 MODELS AFFECTED Lycoming (L)TIO-540-J2B and (L)TIO-540-J2BD model engines with engine serial numbers listed in Table 1 in this bulletin. Kelly Aerospace turbocharger assemblies sold as spares with Lycoming P/N LW-12463 and Kelly Aerospace serial numbers listed in Kelly Aerospace Service Bulletin No. 029. These spare turbochargers were shipped from Lycoming between January 1...

DATE: September 21, 2007 MODELS AFFECTED All cylinder kits listed in Table 1 shipped between June 8, 2007 and August 1, 2007. All Lycoming engines installed with cylinder assemblies that were received in the cylinder kits listed in Table 1 shipped between June 8, 2007 and August 1, 2007. TIME OF COMPLIANCE For uninstalled cylinder kits – immediately. For engines with affected cylinder kits –...

DATE: September 21, 2007 MODELS AFFECTED All Lycoming aircraft engines employing TCM and Bendix S4LN-21, S6LN- 25, S4LN-204, S6LN-204, S4LSC-21T, S6LSC-25T, S4LSC-204T, S6LSC- 204T series magnetos. TIME OF COMPLIANCE Same as that required for Service Bulletin No. 663A. This reprint is current at the time Service Bulletin No. 576 is issued. However, when complying with this Service Bulletin, insure...

Supersedes Service Bulletin No. 574 July 20, 2007 MODELS AFFECTED Any Lycoming engine model listed in Table 1 that was manufactured, rebuilt, or overhauled between September 7, 2006 and October 18, 2006. Any cylinder kit listed in Table 2 that was received between September 7, 2006 and October 18, 2006. TIME OF COMPLIANCE At the next maintenance event or within 50 hours of engine operation...

DATE: March 16, 2007 Supplement No. 1 to Service Bulletin No. 573 is being issued to correct the serial number suffix of certain TIO-540-AJ1A engines.

DATE: February 23, 2007 MODELS AFFECTED Lycoming new, rebuilt, overhauled or repaired TIO-540-A2C, -J2B, -U2A, -AE2A, -AG1A, -AH1A, -AJ1A, -AK1A, -F2BD, -J2BD with serial numbers listed in Table 3. TIME OF COMPLIANCE At the next maintenance event or within 50 hours of engine operation; whichever occurs first. A relief valve and system check can be performed with either the model 11-10090 Air Flow...

DATE: October 30, 2006 MODELS AFFECTED This Service Bulletin applies to new, rebuilt, overhauled or repaired Lycoming O-235 engines and accessory housing kit P/N 05K21678 shipped from Lycoming between September 1, 2003 and June 1, 2006. The engines and spare kits listed above may contain accessory housing P/N 21A23000, S/N 7212-0001 through 7212-0060. TIME OF COMPLIANCE Within the next 50 hours...

Supersedes Service Bulletin No. 544A October 6, 2006 MODELS AFFECTED All Lycoming TIO-540-AE2A aircraft engines. TIME OF COMPLIANCE At overhaul or any time main or connecting rod bearings are replaced. Although various bearings may fit different engines interchangeably, there are differences in material and construction that restrict the use of specific bearings to specific engine models.