Airworthiness directives › 2018-13-02
AD 2018-13-02 Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Applicability*9
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.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
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.
Unsafe condition
This AD was prompted by the discovery of multiple cracked air seals. We are issuing this AD to prevent failure of the 4th stage LPT air seal. This unsafe condition, if not addressed, could result in uncontained release of the air seal, damage to the engine, and damage to the airplane.
Affected ADs
None.
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