Supersedes Service Bulletin No. 475B January 30, 2003 MODELS AFFECTED All Lycoming direct drive piston aircraft engines (including VO-360 and IVO-360; excepting O-320-H, O-360-E, LO-360-E, TO-360-E, LTO-360-E, and TIO-541 series engines). TIME OF COMPLIANCE During overhaul, after a propeller strike, or whenever crankshaft gear removal is required. Damage to the crankshaft gear and the counterbored...

DATE: January 29, 2003 MODELS AFFECTED See Table 1 in attached bulletin. NOTE: Service Bulletin No. 556 affects any engine that has had P/N LW-11201 washers field replaced with P/N LW-11201 washers shipped 2/1/99 through 6/25/02 as spares, regardless of whether or not the engine serial number is listed in Table 1. NOTE: All P/N LW-11201 washers shipped from Lycoming as spares between 2/1/99 and 6...

DATE: December 16, 2002 Supplement No. 1 to Lycoming Service Bulletin No. 553 provides the following additions or revisions: 1. Specific numbering information will assist in the identification of affected crankshafts. Lycoming crankshaft serial numbers are in one of the following formats: a. “V5379” followed by 4 or 5 digits (1997 to present.) b. An “I” followed by 5 digits (1996 – 1997.) c. A “V”...

Supersedes Supplement No. 1 and No. 2 to Service Bulletin No. 554 DATE: November 12, 2002 Supplement No. 3 to Lycoming Service Bulletin No. 554 provides the following additions and revisions to Service Bulletin No. 554, Supplement No. 1 and Supplement No. 2 to Service Bulletin No. 554.

DATE: September 30, 2002 MODELS AFFECTED All engines listed in Table 1. All O, IO, (L)TIO or AEIO-540 engines that have had a crankshaft bolt replaced during maintenance or overhaul between November 27, 1996 and November 10, 1998. TIME OF COMPLIANCE Within the next ten (10) hours of operation or seven (7) days, whichever occurs first. Lycoming has determined that a metallurgical condition has...

DATE: September 16, 2002 MODELS AFFECTED Those Lycoming TIO and LTIO-540 engines listed in Table 1 below. Any field overhauled Lycoming TIO and LTIO-540 engine rated at 300 horsepower or higher that has a crankshaft installed with a serial number listed in Table 2. Any Lycoming IO-540 engine that has an aftermarket turbocharger installed under an STC and has a crankshaft serial number listed in...

DATE: September 5, 2002 Lycoming Service Bulletin No. 552 requires replacement of crankshafts in some turbocharged Lycoming TIO and LTIO-540 engines rated at 300 horsepower or higher.

Supersedes and Replaces Service Bulletin No. 550 DATE: August 16, 2002 MODELS AFFECTED Service Bulletin No. 552 applies only to TIO and LTIO-540 engines rated at 300 horsepower or higher. Engines that previously complied with Service Bulletin No. 550 are also affected by Service Bulletin No. 552. TIME OF COMPLIANCE Before further flight. Lycoming has received several field reports of broken...

Supersedes Service Bulletin No. 529 A June 10, 2002 MODELS AFFECTED All Lycoming aircraft engines employing new or overhauled “AN” rotary fuel pump model series RG9080, RG9570 and RG17980, including: IO-320, LIO-320; IO-360, HIO-360, TIO-360; GO-435; GO-480, IGO-480; IO-540, AEIO-540, HIO-540, TIO-540, LTIO-540, IGO-540, TIVO-540; TIGO-541; IO-720 engine models. (See Effectivity for Service...