Airworthiness Directives; AlliedSignal Inc. TPE331 Series Turboprop Engines

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This document proposes the adoption of a new airworthiness directive (AD) that is applicable to certain AlliedSignal Inc. TPE331 series turboprop engines. This proposal would establish cyclic retirement lives for certain compressor components. This proposal is prompted by manufacturer's engine testing and analysis that indicate that if these compressor components continue in service without an established retirement life, accumulative cyclic effects may result in a fatigue failure. The actions specified by the proposed AD are intended to prevent fatigue failure of engine compressor components and an inflight engine shutdown.