Summary
We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines. This AD was prompted by an uncontained failure of a high-pressure turbine (HPT) hub during takeoff. This AD requires an inspection to measure the surface condition of the aft side web/rim fillet of HPT 1st stage hubs and removal from service of hubs that fail inspection. We are issuing this AD to correct the unsafe condition on these products.
Directive Details
AD Number
FAA-2016-8836
Document Number
2017-04627
Type
Rule
Publication Date
March 9, 2017
Effective Date
April 13, 2017
Affected Manufacturer
Pratt & Whitney Division Turbofan
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2016-8836
Topics
Official Documents
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