Airworthiness directives › 2017-05-05
AD 2017-05-05 Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Applicability*9
This AD applies to all Pratt & Whitney Division (PW) PW4074, PW4074D, PW4077, PW4077D, PW4084D, PW4090, and PW4090-3 turbofan engines.
Compliance
After the effective date of this AD, do not install, or re-install into any engine, any HPT 1st stage hub that has not been inspected and passed the inspection required by paragraph (e) of this AD.
Required actions
You may take credit for the replication inspection of the HPT 1st stage hub that is required by paragraph (e)(1) of this AD, if you performed the inspection before the effective date of this AD using PW Special Instruction (SI) No. 250F-16, dated June 22, 2016, or PW SI No. 250F-16, Revision A, dated July 14, 2016.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done. (1) After the effective date of this AD, perform the HPT 1st stage hub web/rim fillet replication inspection and measurement as follows: (i) For PW4074D, PW4077D, PW4084D, PW4090, and PW4090-3 engine models, the next time the engine is disassembled sufficiently to expose the HPT module, use the Accomplishment Instructions, Part A, paragraphs 2.A. and 2.B.(1) through 2.B.(4) of PW Service Bulletin (SB) PW4G-112-72-342, dated September 23, 2016, to do the inspection. (ii) For PW4074 and PW4077 engine models, the next time the HPT module is disassembled sufficiently to expose the HPT 1st stage hub, use the Accomplishment Instructions Part B, paragraphs 1.A. and 1.B.(1) through 1.B.(4) of PW SB PW4G-112-72-342, dated September 23, 2016, to do the inspection. (2) If the hub fails the inspection, remove the hub from service before further flight and replace with a part eligible for installation.
Affected ADs
None.
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