Airworthiness Directives; Honeywell International Inc. (formerly AlliedSignal Inc. and Textron Lycoming Inc.) LTS101 Series Turboshaft and LTP101 Series Turboprop Engines

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This document proposes the supersedure of an existing airworthiness directive (AD), applicable to certain Honeywell International Inc. (formerly AlliedSignal Inc. and Textron Lycoming Inc.) LTS101 series turboshaft and LTP101 series turboprop engines. The existing airworthiness directive (AD) superseded priority letter AD 94- 19-01 and currently requires initial and repetitive inspections of the engine fuel pump internal drive splines for wear, and replacement of engine fuel pumps that exhibit wear beyond specified limits. This proposal would require a reduction in inspection intervals for the engine fuel pump internal drive splines. This proposal is prompted by a report from the engine manufacturer that 13 percent of the pumps installed on aircraft that were returned from the field for the required 900-hour interval inspection revealed excessive internal drive spline wear. The actions specified by this proposal are intended to prevent worn splines in fuel pumps that could cause engine fuel pump failure, which can result in total engine power loss and possible loss of the aircraft.