Airworthiness directives › 2011-25-09
AD 2011-25-09 Airworthiness Directives; Pratt & Whitney Division (PW) PW4000 Series Turbofan Engines
Applicability*9
This AD applies to the following Pratt & Whitney Division (PW) turbofan engines, with high-pressure turbine (HPT) stage 1 airseal, part number (P/N) 50L879; HPT stage 2 airseal, P/N 53L030; or HPT stage 1 airseal ring, P/N 50L664, installed: (1) PW4000-100″ Engines PW4000-100″ engine models PW4164, PW4164C, PW4164C/B, PW4168, and PW4168A. (2) PW4000-94″ Engines (i) PW4000-94″ engine models PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4156A, PW4158, PW4160, PW4460, and PW4462 that have incorporated either Engineering Change Numbers EC92KK322G, H, I, J, and K, or one of the following PW Service Bulletins (SBs): PW4ENG 72-490, PW4ENG 72-504, PW4ENG 72-512, PW4ENG 72-572, PW4ENG 72-588, PW4ENG 73-150; as indicated with a (-3), (-3A), or (-3B) suffix on the engine data plate. (ii) PW4000-94″ engine models PW4050, PW4052, PW4056, PW4152, PW4156, and PW4650 that have incorporated either Engineering Change Numbers EC92KK322G, H, I, J, and K, or one of the following PW SBs: PW SB PW4ENG 72-490, PW4ENG 72-504, PW4ENG 72-512, PW4ENG 72-572, PW4ENG 72-588, PW4ENG 73-150; as indicated with a (-3), (-3A), or (-3B) suffix on the engine data plate.
Compliance
Remove the stage 1 HPT airseal, P/N 50L879, at the next piece-part exposure after the effective date of this AD or before accumulating the number of cycles listed in Table 1 of this AD, whichever occurs later. Table 1—Removal of Stage 1 HPT Airseals, P/N 50L879, by Cycles-Since-New (CSN) For engine model . . . Remove stage 1 HPT airseal by . . . (1) Listed in paragraph (c)(1) of the Applicability Section of this AD 12,600 CSN. (2) Listed in paragraph (c)(2)(i) of the Applicability Section of this AD 13,900 CSN. (3) Listed in paragraph (c)(2)(ii) of the Applicability Section of this AD 18,900 CSN.
Required actions
Remove the stage 2 HPT airseal, P/N 53L030, at the next piece-part exposure after the effective date of this AD or before accumulating the number of cycles listed in Table 2 of this AD, whichever occurs later. Table 2—Removal of Stage 2 HPT Airseals, P/N 53L030, by CSN For engine model . . . Remove stage 2 HPT airseal by . . . (1) Listed in paragraph (c)(1) of the Applicability Section of this AD 13,900 CSN. (2) Listed in paragraph (c)(2)(i) of the Applicability Section of this AD 13,800 CSN. (3) Listed in paragraph (c)(2)(ii) of the Applicability Section of this AD 15,900 CSN.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done.
Affected ADs
None.
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