Summary
We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW6122A and PW6124A turbofan engines. This AD requires initial and repetitive borescope inspections (BSIs) of the high-pressure compressor (HPC) 7th stage integrally bladed (IB) rotor aft integral arm for cracks until replacement of the HPC 7th stage IB rotor using non-silver-plated nuts. This AD was prompted by reports of crack finds in the HPC 7th stage IB rotor. We are issuing this AD to prevent HPC 7th stage IB rotor fractures, which could lead to uncontained engine failure and damage to the airplane.
Directive Details
AD Number
FAA-2015-0266
Document Number
2015-14992
Type
Rule
Publication Date
June 19, 2015
Effective Date
July 6, 2015
Affected Manufacturer
Pratt & Whitney Division Turbofan
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2015-0266
Topics
Official Documents
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