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AD 2012-19-01 Lycoming Engines Reciprocating Engines

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SUMMARY: 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.

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