AD 2011-14-07
Effective 09/08/2011 · Published 08/04/2011
Airworthiness Directives; Pratt & Whitney (PW) Models PW4074 and PW4077 Turbofan Engines
Summary
We are adopting a new airworthiness directive (AD) for the products listed above. This AD requires removing the 15th stage HPC disk within 12,000 cycles since new (CSN) or, for any disks that exceed 12,000 CSN after the effective date of this AD using a drawdown plan that includes a borescope inspection (BSI) or eddy current inspection (ECI) of the rim for cracks. This AD was prompted by multiple shop findings of cr…