Superseded. This AD was superseded by AD 2023-22-02. Verify which one applies to your serial and effectivity before any maintenance action.
AD 2018-02-10
Effective 02/26/2018 · Published 01/22/2018
Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Summary
We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines. This AD was prompted by the discovery of multiple cracked outer diffuser cases. This AD requires initial and repetitive inspections to detect cracks in the outer diffuser case and removal from service of cases that fail inspection. We are issuing t…