AD 2012-18-03
Effective 10/11/2012 · Published 09/06/2012
Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Summary
We are adopting a new airworthiness directive (AD) for certain Pratt & Whitney Division PW4000-94" and PW4000-100" turbofan engines having a 1st stage high-pressure turbine (HPT) seal support, part number (P/N) 55K601 (contained within assembly P/N 55K602-01) or P/N 50K532 (contained within assembly P/N 50K530-01), installed. This AD was prompted by 58 reports of cracked 1st stage HPT air seal rings, including 15 in…