AlliedSignal Inc. Proposes Supersession of Airworthiness Directives for ALF502 and LF507 Series Turbofan Engines

Summary

AlliedSignal Inc. is proposing the replacement of two existing airworthiness directives for its ALF502 and LF507 series turbofan engines, which require rework or replacement of certain components to ensure the integrity of the reduction gear system and overspeed protection system, following a report of a contained power turbine rotor shaft separation on an ALF502R-5 engine.