Airworthiness directives › 2015-22-03
AD 2015-22-03 Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Applicability*9
This AD applies to: (1) All Pratt & Whitney Division PW4164, PW4168, PW4168A, PW4164C, PW4164C/B, PW4164-1D, PW4168-1D, PW4168A-1D, PW4170, PW4164C-1D, and PW4164C/B-1D turbofan engines with a low-pressure turbine (LPT) 4th stage inner air seal (IAS), part number (P/N) 51N038, installed. (2) All PW4050, PW4052, PW4056, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4152, PW4156, PW4156A, PW4158, PW4160, PW4460, PW4462, and PW4650 turbofan engines including models with a “-3” suffix with an LPT 4th stage IAS, P/N 51N038, installed.
Compliance
(1) Do not install any LPT 4th stage IAS, P/N 51N038, with more than 0 flight cycles on any engine listed in paragraph (c)(1) of this AD. (2) Do not install on any engine listed in paragraphs (c)(2) of this AD, any LPT 4th stage IAS, P/N 51N038, which was previously installed on any engine listed in paragraph (c)(1) of this AD.
Required actions
For the purposes of this AD: (1) An LPT overhaul is defined as when all disks in the rotor are removed from the engine and the blades are removed. (2) An “engine shop visit” is the induction of an engine into the shop for maintenance involving the separation of pairs of major mating engine flanges (lettered flanges). The separation of engine flanges solely for the purpose of transportation without subsequent engine maintenance does not constitute an engine shop visit.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done. For the engines listed in paragraph (c)(1) of this AD: (1) At each LPT overhaul after the effective date of this AD, remove from service the LPT 4th stage IAS, P/N 51N038. (2) At each engine shop visit after the effective date of this AD, remove from service the LPT 4th stage IAS, P/N 51N038, if it has more than 10,900 cycles since new.
Affected ADs
None.
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