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 engines [Docket No. FAA-2006-24785; Directorate Identifier 2006-NE-20-AD] – This proposed AD would require operators to replace certain crankshafts. This proposal would supersede an existing directive (AD 2006-20-09), retaining all its requirements, but changing the start date of affected engine models from March 1, 1997, to Jan. 1, 1997. The proposed AD is intended to prevent ...


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