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FAA-2006-24785 Lycoming Engines Reciprocating Engines

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We are superseding an existing airworthiness directive (AD) for certain Lycoming
Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO-540, AEIO-540, (L)TIO-540, IO-580, and IO-
720 series reciprocating engines. That AD currently requires replacing certain crankshafts in the
affected engines. This AD continues to require replacing certain crankshafts, corrects the start date of
affected engine models in Lycoming Mandatory Service Bulletin (MSB) No. 569A to the start date in
Supplement No. 1 to Lycoming MSB No. 569A, dated May 27, 2009, and includes additional
(formerly experimental) IO-390, AEIO-390, and AEIO-580 series engine models having affected
crankshafts. This AD was prompted by Lycoming Engines discovering that the start date of affected
engine models in MSB No. 569A is incorrect and the need to include additional engine models
having the affected crankshafts. We are issuing this AD to prevent failure of the crankshaft, which
will result in total engine power loss, in-flight engine failure, and possible loss of the aircraft.

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