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Wed, Dec 07, 2011

AD: Pratt & Whitney Engines

AD NUMBER: 2011-25-09

MANUFACTURER: Pratt & Whitney Division (PW) PW4000 Series Turbofan Engines
SUBJECT: Airworthiness Directive 2011-25-09
ACTION: Final rule

SUMMARY: This AD was prompted by an updated low-cycle fatigue (LCF) life analysis performed by PW. This AD requires removing certain part number (P/N) high-pressure turbine (HPT) stage 1 and HPT stage 2 airseals and HPT stage 1 airseal rings before their published life limit and establishes a new lower life limit for these parts. The FAA is issuing this AD to prevent failure of these parts, which could lead to an uncontained engine failure and damage to the airplane.

DATES: This AD is effective January 10, 2012.

FMI: AD

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