Airworthiness Directives; AlliedSignal Engines (Formerly Textron Lycoming) LTS101 Series Turboshaft and LTP101 Series Turboprop Engines

This amendment adopts a new airworthiness directive (AD) that is applicable to AlliedSignal Engines (formerly Textron Lycoming) LTS101 series turboshaft and LTP101 series turboprop engines. This action supersedes priority letter AD 94-19-01 that currently requires initial and repetitive inspections for wear of the engine fuel pump internal drive splines, and replacement of engine fuel pumps that exhibit wear beyond specified limits. This action clarifies the original requirements of the current AD by providing additional information to emphasize that the AD only applies to engines installed on single-engine aircraft and to emphasize that removed fuel pumps must be returned to the manufacturer for inspection. In addition, this action defines a serviceable part. This amendment is prompted by requests to clarify interpretations of the current priority letter AD. The actions specified by this AD are intended to prevent engine fuel pump failure, which can result in total engine power loss and possible loss of the aircraft.