Airworthiness Directives; General Electric Company (GE) CF-645 and CF6-50 Series Turbofan Engines

Résumé

This document proposes to revise an existing airworthiness directive (AD), applicable to certain GE turbofan engines. That AD currently requires initial and repetitive inspections of high pressure compressor (HPC) rear shafts and installation of a certain rear shaft flange bolt configuration. This action would add additional HPC rear shaft part numbers for reworked rear shafts to the AD. This proposal is prompted by the need to ensure that the additional HPC rear shafts listed in this proposed rule receive the same inspections as part numbers covered by the current amendment. The actions specified by the proposed AD are intended to detect and replace cracked HPC rear shafts, which, if not replaced, could lead to an uncontained engine failure.