Airworthiness directives › 2022-12-12
AD 2022-12-12 Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Applicability*9
This AD applies to Pratt & Whitney Division (PW) PW4062 model turbofan engines with an installed low-pressure turbine (LPT) stage 5 air seal, part number (P/N) 50N324, having a serial number (S/N) listed in Table 1 to paragraph (c) of this AD, installed. ER17JN22.033
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
At the next piece-part exposure, or before the LPT stage 5 air seal accumulates 8,240 cycles since new, whichever occurs first after the effective date of this AD, remove the LPT stage 5 air seal from service and replace it with a part eligible for installation.
Unsafe condition
This AD was prompted by a report of a manufacturing quality escape due to insufficient cooling of the LPT stage 5 air seal resulting in a reduction of the life of the low-cycle fatigue (LCF) life limit. The FAA is issuing this AD to prevent failure of the LPT stage 5 air seal. The unsafe condition, if not addressed, could result in the uncontained release of the LPT stage 5 air seal, damage to the engine, and damage to the airplane.
Affected ADs
None.
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