The Federal Aviation Administration (FAA) proposes to adopt a new airworthiness directive (AD) that is applicable to certain models of Pratt & Whitney (PW) PW 4000 series turbofan engines. This proposal
would require operators to perform initial and repetitive inspections for cracking of high pressure compressor (HPC) front drum rotors based on cycle usage. This proposal would also require the removal from service of any cracked HPC front drum rotors. This proposal is prompted by reports that seven HPC drum rotors have been found cracked on the spacer surface between the 6th and 7th stage disks. The actions specified by the proposed AD are intended to detect premature cracking of the HPC drum rotor that could result in an uncontained engine failure and damage to the airplane.
Comments must be received by May 21, 2001.
U.S. DOT/FAA - Notice of Disposition of Prior Petitions
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