Airworthiness directives › 2012-16-01
AD 2012-16-01 Airworthiness Directives; Pratt & Whitney Division Turbofan Engines
Applicability*9
This AD applies to the following Pratt & Whitney Division turbofan engines: (1) PW4052, PW4152, and PW4056 turbofan engines, including models with any dash number suffix, with a high-pressure turbine (HPT) stage 1 front hub part number (P/N) listed in Table 1 to paragraph (c) of this AD installed. (2) PW4156A, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4158, PW4460, and PW4462 turbofan engines, including models with any dash number suffix, with an HPT stage 1 front hub P/N listed in Table 1 to paragraph (c) of this AD installed. Table 1 to Paragraph (c) P/N 51L601 All serial numbers (S/Ns). P/N 52L401 With a S/N not listed in Table 5 of the Accomplishment Instructions of Pratt & Whitney Alert Service Bulletin (ASB) No. PW4ENG A72-821, dated July 6, 2012. P/N 51L201, P/N 51L201-001, P/N 51L201-021 All S/Ns. P/N 51L901, P/N 52L301 With an S/N not listed in Table 7 of the Accomplishment Instructions of Pratt & Whitney ASB No. PW4ENG A72-821, dated July 6, 2012. (3) PW4164, PW4164C, PW4164C/B, PW4168, and PW4168A turbofan engines with an HPT stage 1 front hub, P/N 51L901, installed with an S/N not listed in Table 3 of the Accomplishment Instructions of Pratt & Whitney ASB No. PW4G-100-A72-246, dated June 28, 2012.
Compliance
(1) For HPT stage 1 front hubs listed in paragraph (c)(1) of this AD, do the following: (i) If the HPT stage 1 front hub has accumulated 17,000 or fewer cycles-since-new (CSN) on the effective date of this AD, remove the HPT stage 1 front hub from service before accumulating 18,000 CSN. (ii) If the HPT stage 1 front hub has accumulated more than 17,000 CSN on the effective date of this AD, remove the HPT stage 1 front hub from service before accumulating an additional 1,000 cycles-in-service (CIS) or at the next piece-part exposure above 18,000 CSN, whichever occurs first. (2) For HPT stage 1 front hubs listed in paragraphs (c)(2) and (c)(3) of this AD, do the following: (i) If the HPT stage 1 front hub has accumulated 12,700 or fewer CSN on the effective date of this AD, remove the HPT stage 1 front hub from service before accumulating 13,700 CSN. (ii) If the HPT stage 1 front hub has accumulated more than 12,700 CSN on the effective date of this AD, remove the HPT stage 1 front hub from service before accumulating an additional 1,000 CIS or at the next piece-part exposure above 13,700 CSN, whichever occurs first.
Required actions
After the effective date of this AD, do not install into any engine any HPT stage 1 front hubs listed in paragraph (c)(1) of this AD that are at piece-part exposure and exceed 18,000 CSN, or any HPT stage 1 front hubs listed in paragraphs (c)(2) and (c)(3) of this AD that are at piece-part exposure and exceed 13,700 CSN.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done.
Affected ADs
None.
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