Airworthiness Directives; Avco Lycoming and Textron Lycoming Reciprocating Engines

This amendment supersedes an existing airworthiness directive (AD), applicable to Avco Lycoming and Textron Lycoming reciprocating engines, that currently requires removal from service of defective piston pins, and replacement with serviceable parts. This amendment adds additional affected engine models that may have defective piston pins installed, and references a revised service bulletin. This amendment is prompted by the determination that additional engine models may have defective piston pins installed. The actions specified by this AD are intended to prevent piston pin failure, which could result in engine failure.