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.

This Special Airworthiness Information Bulletin (SAIB) alerts registered owners, operators, and
certified repair facilities of all airplanes equipped with Continental Motors, Inc. (CMI) series engines
(all models) of the service instructions to inspect the connecting rod piston pin bushing installation at
each cylinder removal or any time piston pin bushing material is identified during routine
maintenance procedures.