AD 2011-18-09
Effective 09/29/2011 · Published 09/14/2011
Airworthiness Directives; Lycoming Engines Model IO-720-A1B Reciprocating Engines
Summary
We are adopting a new airworthiness directive (AD) for certain model IO-720-A1B Lycoming Engines reciprocating engines. This AD requires a crankshaft inspection for certain parts that may be installed. This AD was prompted by the failure of a crankshaft due to incorrect parts installed. We are issuing this AD to prevent engine crankshaft failure and damage to the airplane.