Summary
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.
Directive Details
AD Number
FAA-2015-0869
Document Number
2015-26346
Type
Rule
Publication Date
October 23, 2015
Effective Date
November 27, 2015
Affected Manufacturer
Pratt & Whitney Turbofan
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2015-0869
Topics
Official Documents
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