Superseded. This AD was superseded by AD 2022-06-09. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2019-03-01
Effective 03/22/2019 · Published 02/15/2019
Airworthiness Directives; Pratt & Whitney Division (PW) Turbofan Engines
Summary
We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Division (PW) PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines. This AD was prompted by an in-flight failure of a 1st-stage low-pressure compressor (LPC) blade. This AD requires initial and repetitive thermal acoustic imaging (TAI) inspections for cracks in certain 1st-stage LPC blades and removal of those…