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.

DATE:May 5, 2006 MODELS AFFECTED Lycoming IO-540-AC1A5, TIO-540-AJ1A model engines. TIME OF COMPLIANCE Same as required for Sky-Tec Service Bulletin No. 2006-3-1. This reprint is current at the time Lycoming Service Bulletin No. 571 is issued. However, when complying with this Service Bulletin, insure that compliance is in accordance with the latest revision of Sky-Tec Service Bulletin No. 2006-3...

Supersedes Service Bulletin No. 569 Aprl 11, 2006 MODELS AFFECTED Any Lycoming engine model specified below manufactures, rebuilt, overhauled, or repaired after March 1, 1997: Lycoming counterweighted (L)IO-360, and AEIO-360 engines described in section 1. Lycoming IO-390 and AEIO-590 engines described in Section 2. Lycoming O-540, IO-540, AEIO-540 and (L)TIO-540 engines described in Section 3...

DATE: November 30, 2005 MODELS AFFECTED Any Lycoming engine model specified below manufactured, rebuilt, overhauled or repaired after March 1, 1999: Lycoming counterweighted (L)O-360, (L)IO-360 and AEIO-360 engines rated at any horsepower as listed in Table 1. Any overhauled or repaired Lycoming counterweighted (L)O-360, (L)IO- 360 or AEIO-360 engine that has had a crankshaft replaced after March...

DATE: July 11, 2005 MODELS AFFECTED Any Lycoming engine model specified below manufactured, rebuilt, overhauled or repaired after March 1, 1999: Lycoming O-540, IO-540, AEIO-540 and TIO-540 engines rated at 290 horsepower or lower as described in Section 1 and listed in Table 1. Lycoming IO-540-P, -S, -AA engines rated at 250-290 horsepower by Lycoming as described in Section 2 and listed in Table...

Supersedes Service Bulletin No. 530A November 22, 2004 MODELS AFFECTED The following Lycoming four cylinder engines which utilize fixed pitch propellers except new engines shipped after February 15, 1997. All 235 series engines; All 290 series engines; All 320 series engines; and All 180 horsepower, 360 series engines except O-360-A4A, -A4AD, -A4D, -A4G, -A4J, -A4K, -A4M, -A4N, -A4P, -A5AD, -C4F,...

Supersedes Service Bulletin No. 388B and Supplement No. 1 to Service Bulletin No. 388B November 22, 2004 TIME OF COMPLIANCE Helicopter Engines – 300 hour intervals or earlier if valve sticking suspected. All Other Engines – 400 hour intervals or earlier if valve sticking suspected until exhaust valve guides are replaced with guides made of improved material. (Refer to latest revision of Service...