AD 2012-06-14
Effective 04/27/2012 · Published 03/23/2012
Airworthiness Directives; Pratt & Whitney (PW)Turbofan Engines
Summary
We are adopting a new airworthiness directive (AD) for PW JT9D-7R4G2 and -7R4H1 turbofan engines. This AD was prompted by the determination that a new lower life limit for high-pressure turbine (HPT) 1st stage air seals, part number (P/N) 735907, is necessary. This AD establishes a new lower life limit for HPT 1st stage air seals, P/N 735907, and requires removing them from service using a drawdown schedule. We are…