Supersedes Service Instruction No. 1267C August 28, 2009 MODELS AFFECTED All Lycoming engines with 5-1/8 inch cylinder bore: O-320; IO-320; O-340; O, IO, HO, LO, LIO, AIO, HIO, TIO, VO and IVO-360; IO-390; GO, VO and TVO-435; GO, GSO, IGSO-480; O, IO, VO, TIO, TVO, TIVO and IGSO- 540; TIO and TIGO-541; IO-580, AEIO-580; IO-720. TIME OF COMPLIANCE Any time piston pin plugs are replaced. There are...

DATE: August 28, 2009 This Supplement No. 1 is being issued to inform owners and operators of the following new connecting rod and crankshaft bearing part numbers. These new bearings are interchangeable with the corresponding current bearing part number as listed below in the Table.

Supersedes Service Instruction No. 1492C March 20, 2009 MODELS AFFECTED All Lycoming new or factory rebuilt or factory overhauled engines shipped from Lycoming after January 1, 1994, and all engines which have had a Lycoming Cylinder Kit installed after January 1, 1994, except O-235 models. TIME OF COMPLIANCE At next oil change/oil filter replacement, not to exceed 50 hours of engine operation...

DATE: February 23, 2009 MODELS AFFECTED All Lycoming new, overhauled, rebuilt, or repaired IO-360-A1B6, -B1G6, -C1E6, -C1G6, O-360-A1G6, and TIO-360-C1A6D engines. TIME OF COMPLIANCE At the next maintenance event or at annual inspection, whichever occurs first. Lycoming has determined that a crack may develop in the crankcase near the alternator attaching bracket on any of the above listed engine...

Supersedes Service Instruction No. 1409B February 20, 2009 MODELS AFFECTED All Lycoming piston aircraft engines except for installations that utilize a friction type clutch and a common engine oil system for the transmission and clutch assembly. Check with airframe manufacturer prior to use in these installations. TIME OF COMPLIANCE At initial oil fill and every oil change thereafter. Lycoming...

DATE: January 16, 2009 MODELS AFFECTED All Lycoming new, overhauled, rebuilt, or repaired (L)TIO-540-J2B/J2BD series engine with a Precision Airmotive RSA-10ED1 series fuel injection servo. TIME OF COMPLIANCE Same as required for Precision Airmotive Service Information Letter No. SIL RS-92. This reprint is current at the time Lycoming Service Instruction No. 1525 is issued. However, when...

DATE: November 19, 2008 MODELS AFFECTED All Lycoming new, overhauled, rebuilt, or repaired (L)IO, AIO, HIO, IGO, IVO, (L)TIO, AEIO series engine with either a Precision Airmotive RS or RSA series fuel injection servo. TIME OF COMPLIANCE Same as required for Precision Airmotive Service Information Letter No. SIL RS-35 Revision 1. This reprint is current at the time Lycoming Service Instruction No...

DATE: November 19, 2008 MODELS AFFECTED All Lycoming new, overhauled, rebuilt, or repaired (L)IO, AIO, HIO, IGO, IVO, (L)TIO, AEIO series engine with either a Precision Airmotive RSA- 5AB1, RSA-5AD1, RSA-10AD1, RSA-10ED1, RSA-10ED2, RSA-10DB1 or RSA-10DB2 series fuel injection servo. TIME OF COMPLIANCE Same as required for Precision Airmotive Service Information Letter No. SIL RS-62, Revision 2...

Supersedes Service Instruction No. 1125C October 17, 2008 MODELS AFFECTED All Lycoming opposed cylinder engines. TIME OF COMPLIANCE During engine assembly. The use of POB No. 4 Perfect Seal sealant (POB) and silk thread has been used generally for sealing finished parting surfaces that do not employ gaskets. This practice has always been satisfactory when correctly applied. However, we have tested...