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Wed, Aug 14, 2013

AD: Pratt & Whitney Division Turbofan Engines

AD NUMBER: 2013-15-09

PRODUCT: 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.
SUBJECT: Airworthiness Directive 2013-15-09
ACTION: Final Rule

SUMMARY:  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.

The FAA is 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.

DATES: This AD is effective September 17, 2013.

FMI: AD

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