airworthiness · Rule · Final rule. · Published 2015-10-23 · Effective 2015-11-27 · 80 FR 64312
Document
Document number
2015-26346
Federal Register citation
80 FR 64312
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Pratt & Whitney Turbofan
Publication date
2015-10-23
Effective date
2015-11-27
FAA docket
Docket No. FAA-2015-0869
Abstract
We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney (PW) PW4164, PW4168, PW4168A, PW4164-1D, PW4168-1D, PW4168A-1D, and PW4170 turbofan engines. This AD was prompted by crack finds in the 6th stage low-pressure turbine (LPT) disk. This AD requires removal of the affected 6th stage LPT disks. We are issuing this AD to prevent failure of the 6th stage LPT disk, which could lead to an uncontained disk release, damage to the engine, and damage to the airplane.