Airworthiness Directives; Rolls-Royce Corporation (formerly Allison Engine Company) 501-D Series Turboprop Engines

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The Federal Aviation Administration (FAA) proposes to adopt a new airworthiness directive (AD) that is applicable to Rolls-Royce Corporation (formerly Allison Engine Company) 501-D series turboprop engines. This proposal would require removal from service of certain turbine rotor components at reduced life limits. This proposal is prompted by the result of recalculated material properties by the manufacturer. The actions specified by the proposed AD are intended to prevent uncontained turbine rotor failure resulting in in-flight engine shutdown and possible damage to the airplane.