Airworthiness directives › 2015-12-10
AD 2015-12-10 Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Applicability*9
This AD applies to all Pratt & Whitney Division (PW) PW6122A and PW6124A turbofan engines with high-pressure compressor (HPC) 7th stage integrally bladed (IB) rotor, part number (P/N) 5495637, installed.
Compliance
(1) At the next shop visit after the effective date of this AD: (i) Replace the affected HPC 7th stage IB rotor, P/N 5495637, with a new, zero-time, HPC 7th stage IB rotor, P/N 5495637, and (ii) Remove the HPC 7th stage IB rotor silver-plated nuts, P/N 4301682, and replace with non-silver-plated nuts. Use the Accomplishment Instructions of PW Service Bulletin No. PW6ENG 72-46, dated March 5, 2015 to perform the removal and replacement.
Required actions
For the purposes of this AD 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. The separation of engine flanges solely for the purposes of transportation without subsequent engine maintenance, is not an engine shop visit.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done. (1) Within 180 cycles after the effective date of this AD or within 6,500 cycles accumulated on the HPC 7th stage IB rotor, whichever occurs later, borescope inspect the HPC 7th stage IB rotor for cracks. Use Appendix 1, paragraphs 5 and 6 of PW Engineering Authorization 15MM008, Revision A, dated March 24, 2015, to do your inspection. Thereafter, repeat the inspection at every 1,000 cycles since last inspection. (2) If any crack is detected on the HPC 7th stage IB rotor, then before further flight, replace the HPC 7th stage IB rotor with a part eligible for installation.
Affected ADs
None.
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