airworthiness · Rule · Final rule; request for comments. · Published 2015-06-19 · Effective 2015-07-06 · 80 FR 35191
Document
Document number
2015-14992
Federal Register citation
80 FR 35191
Type
Rule
Action
Final rule; request for comments.
Category
airworthiness
Manufacturer
Pratt & Whitney Division Turbofan
Publication date
2015-06-19
Effective date
2015-07-06
FAA docket
Docket No. FAA-2015-0266
Abstract
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.