AD on PW4000 turbofan engines by Pratt & Whitney

Airworthiness Directive 2011-25-09 on Pratt & Whitney Division (PW) PW4000 Series Turbofan Engines

The FAA is adopting a new airworthiness directive (AD) for certain PW4000 turbofan engines. 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. We are 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.

Below is a list of Engines

2011-25-09 – Engine/Pratt & Whitney Division/PW4050 2011-25-09 – Engine/Pratt & Whitney Division/PW4052 2011-25-09 – Engine/Pratt & Whitney Division/PW4056 2011-25-09 – Engine/Pratt & Whitney Division/PW4060 2011-25-09 – Engine/Pratt & Whitney Division/PW4060A 2011-25-09 – Engine/Pratt & Whitney Division/PW4060C 2011-25-09 – Engine/Pratt & Whitney Division/PW4062 2011-25-09 – Engine/Pratt & Whitney Division/PW4062A 2011-25-09 – Engine/Pratt & Whitney Division/PW4152 2011-25-09 – Engine/Pratt & Whitney Division/PW4156 2011-25-09 – Engine/Pratt & Whitney Division/PW4156A 2011-25-09 – Engine/Pratt & Whitney Division/PW4158 2011-25-09 – Engine/Pratt & Whitney Division/PW4160 2011-25-09 – Engine/Pratt & Whitney Division/PW4164 2011-25-09 – Engine/Pratt & Whitney Division/PW4164C 2011-25-09 – Engine/Pratt & Whitney Division/PW4164C/B 2011-25-09 – Engine/Pratt & Whitney Division/PW4168 2011-25-09 – Engine/Pratt & Whitney Division/PW4168A 2011-25-09 – Engine/Pratt & Whitney Division/PW4460 2011-25-09 – Engine/Pratt & Whitney Division/PW4462 2011-25-09 – Engine/Pratt & Whitney Division/PW4650

pdf icon2011-25-09.pdf

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