AD 2011-25-09
Effective 01/10/2012 · Published 12/06/2011
Airworthiness Directives; Pratt & Whitney Division (PW) PW4000 Series Turbofan Engines
Summary
We are 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 i…