Airworthiness Directive · Amendment 39-12780 · Honeywell International, Inc. (formerly AlliedSignal Inc., and Textron Lycoming) ALF502 and LF507 Series Turbofan Engines
Honeywell International, Inc. (formerly AlliedSignal Inc., and Textron Lycoming) ALF502 and LF507 Series Turbofan Engines
This airworthiness directive (AD) is applicable to Honeywell International, Inc. (formerly AlliedSignal Inc., and Textron Lycoming) ALF502 and LF507 series turbofan engines with certain first turbine rotor sealing plates, first turbine rotor discs, and turbine spacers installed. These engines are installed on, but not limited to, Bombardier (Canadair) CL600-1A11, and British Aerospace BAe 146 series and AVRO 146-RJ series airplanes.
This amendment adopts a new airworthiness directive (AD), that is applicable to Honeywell International, Inc. (formerly AlliedSignal Inc., and Textron Lycoming) ALF502 and LF507 series turbofan engines. This amendment requires removal from service of certain gas producer turbine (GPT) components prior to reaching new, lower cyclic life limits using drawdown plans and replacing with serviceable parts. This amendment is prompted by continuous analysis of field-returned hardware indicating smaller service life margins than originally expected. The actions specified by this AD are intended to prevent GPT component failure, which could result in an uncontained engine failure and damage to the airplane.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
