Airworthiness Directive · Amendment 39-19314 · Turbine engine combustion section
Pratt & Whitney Division Turbofan Engines
This AD applies to all Pratt & Whitney Division (PW) PW4052, PW4056, PW4060, PW4062, PW4062A, PW4152, PW4156A, PW4158, PW4460, and PW4462 turbofan engine models, including engines identified with suffixes -1C, -1E, -3, -3A, or -3B, with 4th stage low-pressure turbine (LPT) air seal, part number (P/N) 50N346, installed.
We are adopting a new airworthiness directive (AD) for all Pratt & Whitney Division (PW) PW4052, PW4056, PW4060, PW4062, PW4062A, PW4152, PW4156A, PW4158, PW4460, and PW4462 turbofan engine models, including engines identified with suffixes -1C, -1E, -3, -3A, or -3B. This AD was prompted by the discovery of multiple cracked 4th stage low-pressure turbine (LPT) air seals in the fleet. This AD requires removal from service of certain 4th stage LPT air seals. We are issuing this AD to address the unsafe condition on these products.
The next time the 4th stage LPT vanes are removed from the LPT module, remove 4th stage air seal, P/N 50N346, from service and replace with a part eligible for installation.
After the effective date of this AD, do not install any 4th stage LPT air seal, P/N 50N346, into any LPT module.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
