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...

DATE: August 6, 2004 MODELS AFFECTED Any Lycoming factory new or overhauled model (L)TIO-540-U2A, -V2AD, and -W2A engines listed on ATTACHMENT I. Any (L)TIO-540-U2A, -V2AD or -W2A engines that have had genuine Lycoming P/N LW-13212 connecting rod bearing installed during field overhaul or field maintenance between August 25, 1995 and the date of this Service Bulletin. TIME OF COMPLIANCE Replace...

DATE: March 23, 2004 MODELS AFFECTED Lycoming new, rebuilt or overhauled engines employing Kelly Aerospace Power Systems starters with Lycoming P/N 31A22470, P/N 31A22472, P/N 31A22473, P/N 31B22474, P/N 31B22475, P/N 31B22476, P/N 31B22477. TIME OF COMPLIANCE Same as required for Kelly Aerospace Power Systems Service Bulletin No. A- 112, Rev. A. Kelly Aerospace Power Systems Service Bulletin No...

DATE: November 17, 2003 MODELS AFFECTED See attached list for engine models and serial numbers. Spares with part numbers 56A22634-01 and 56A22634-02 that were shipped from Lycoming between June 21, 2002 and April 17, 2003 are also affected by this Service Bulletin. TIME OF COMPLIANCE Next oil change or next 50-hour inspection. Lycoming has determined that some oil sumps made from C56B19855...

DATE: August 15, 2003 Supplement No. 5 to Service Bulletin No. 554 does not supersede Supplement No. 3 to Service Bulletin No. 554 or Supplement No. 4 to Service Bulletin No. 554. After extensive and thorough search of all engine and gear bolt records, Lycoming has determined that there are an additional 161 engines that could possibly have one of the suspect bolts. This Supplement No. 5 to...

Supersedes Service Bulletin No. 555 and Supplement No. 2 to Service Bulletin No. 555 May 16, 2003 MODELS AFFECTED New, factory rebuilt or factory overhaul engines listed in Table 1. NOTE: Service Bulletin No. 555 also affects any engine that has had the following oil pump bodies field installed: 1. P/N 78528 shipped between 5/1/01 and 1/20/03. 2. P/N 78890 shipped between 9/17/01 and 1/20/03. 3. P...

DATE: May 7, 2003 MODELS AFFECTED This Service Bulletin applies to new, rebuilt, overhauled or repaired Lycoming fuel injected engines shipped from Lycoming between January 30, 2003 and May 5, 2003 equipped with Precision Airmotive Corporation fuel injection servos, Model RSA-5 or RSA-10 identified in Precision Service Bulletin No. PRS-105. Fuel injected engines are identified by the letter “I” in...

DATE: April 28, 2003 The P/N 18M22676 connecting rod bearing is no longer available from Lycoming. It has been replaced by P/N LW-16143.

DATE: April 2, 2003 The AMOC (see attached) accepts the following Lycoming kits for compliance with AD #2002-23-06: 05K23325 – TIO/LTIO-540-J2B 05K23326 – TIO-540-A2B, -A2C 05K23327 – TIO-540-AJ1A 05K23335 – TIO-540-AE2A 05K23336 – TIO-540-AH1A Check the engine logbook. If the logbook states that Service Bulletin No. 554 was complied with at Lycoming, then an improved cadmium-plated crankshaft...