Summary
We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Division PW4000-94" and PW4000-100" turbofan engines having a 1st stage high-pressure turbine (HPT) seal support, part number (P/N) 55K601 (contained within assembly P/N 55K602-01) or P/N 50K532 (contained within assembly P/N 50K530-01), installed. This AD was prompted by 58 reports of cracked 1st stage HPT air seal rings, including 15 in-flight engine shutdowns. This AD requires removal and replacement of the 1st stage HPT seal support and inspection of the 1st stage HPT air seal ring. We are issuing this AD to prevent failure of the 1st stage HPT air seal ring, which could lead to an internal oil fire, uncontained engine failure, and damage to the airplane.
Directive Details
AD Number
FAA-2012-0228
Document Number
2012-21821
Type
Rule
Publication Date
September 6, 2012
Effective Date
October 11, 2012
Affected Manufacturer
Pratt & Whitney Division Turbofan
Criticality
important
Emergency
No
Docket ID
Docket No. FAA-2012-0228
Topics
Official Documents
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