airworthiness · Rule · Final rule. · Published 2013-08-13 · Effective 2013-09-17 · 78 FR 49111
Document
Document number
2013-19429
Federal Register citation
78 FR 49111
Type
Rule
Action
Final rule.
Category
airworthiness
Manufacturer
Pratt & Whitney Division Turbofan
Publication date
2013-08-13
Effective date
2013-09-17
FAA docket
Docket No. FAA-2013-0072
Abstract
We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) turbofan engine model PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 with a certain second- stage high-pressure turbine (HPT) air seal part number installed. This AD was prompted by discovery of cracks in second-stage HPT air seals. This AD requires inspection and removal from service of HPT air seals that fail inspection. We are issuing this AD to prevent failure of the second-stage HPT air seal, which could lead to an uncontained engine failure and damage to the airplane.