DATE: March 23, 2001 MODELS AFFECTED See Attachment I for affected engine/crankshaft serial numbers. TIME OF COMPLIANCE Within the next 100 hours of operation but not to exceed 180 days from the date of this Service Bulletin. Textron Lycoming has identified a potential metallurgical condition on a number of 4-cylinder crankshafts that shipped from the factory May 1, 1997 through April 30, 2000...

DATE: March 7, 2001 MODELS AFFECTED I. Any Textron Lycoming model TIO-540-AE2A engine listed on ATTACHMENT I that has not complied with the connecting rod bearing replacement requirement of Special Advisory No. 59-800. II. Except if replaced in compliance with Special Advisory No. 59-800, any TIO-540- AE2A engine known to have had connecting rod bearings field replaced after August 25, 1995. TIME...

Supersedes Service Bulletin No. 539 and Supplement No. 1 November 22, 2000 MODELS AFFECTED Those Textron Lycoming aircraft engines shipped before December 11, 1999, that employ Crane/Lear Romec rotary fuel pump models identified below. TIME OF COMPLIANCE Same as that required for Crane/Lear Romec Service Bulletins No. RG9080- 73-001, No. RG9570- 73-001, and No. RG17980-73-001. Crane/Lear Romec...

Supersedes Service Bulletin No. 505A December 1, 1997 MODELS AFFECTED The following Textron Lycoming four cylinder engines which utilize fixed pitch propellers except those installed in rotary wing aircraft or new engines shipped after February 15,1997: All 320 series engines; and All 180 horsepower, 360 series engines except the O-360-A4A, -A4D, A4G, - A4J, -A4K, -A4M, -A4N, -A4P -C4F, -C4P, IO...

DATE: January 18, 1996

(Supersedes Service Bulletin No. 381, Service Bulletin No. 385, Service Bulletin No. 454B, Service Bulletin No. 455D, and Service Bulletin No. 456F) DATE: September 1, 1995 MODELS AFFECTED See attached Lists I and II for specific models and serial numbers. All new, overhauled and remanufactured engines shipped from the factory after March 31, 1985 are in compliance with this Service Bulletin. TIME...

DATE: June 3, 1988 MODELS AFFECTED All AEIO-540-D series, IO-540 (250 & 260 horsepower) engines converted for aerobatic flight or any other 540 engines employing a 2-3/8 diameter main bearing seal used in unlimited category aerobatic maneuvers. TIME OF COMPLIANCE Visual inspections within next 10 hours and at each 10 hour interval of unlimited aerobatics or earlier at owner's discretion. Reports...

Supersedes Service Letter No. L255 May 13, 2016 To All Owners and Operators of Lycoming Piston Aircraft Engines An alternate diaphragm-type fuel pump P/N 62B26931 is approved as an equivalent replacement for the current fuel pump P/N LW-15473 except as noted in Table 1.

Supersedes Service Letter No. L264 To All Owners and Operators of Lycoming Engine Models with Champion Magnetos REASON FOR REVISION Deleted Table 1 and Figure 1 in the attached Service Letter If any of the following occur on a Lycoming engine after installation of Champion Slick 4300/6300 Series magnetos, complete the instructions per the attached Champion Slick Magneto Service Letter 4300/6300-74...