Airworthiness Directive 2012-16-01
one-timeAirworthiness Directives; Pratt & Whitney Division Turbofan Engines
What this AD requires
We are adopting a new airworthiness directive (AD) for Pratt & Whitney Division PW4052, PW4152, PW4056, PW4156A, PW4060, PW4060A, PW4060C, PW4062, PW4062A, PW4158, PW4460, PW4462, PW4164, PW4164C, PW4164C/B, PW4168, and PW4168A turbofan engines with certain high- pressure turbine (HPT) stage 1 front hubs installed. This AD was prompted by Pratt & Whitney's updated low-cycle-fatigue analysis that indicated certain HPT stage 1 front hubs could initiate a crack prior to the published life limit. This AD requires removing the affected HPT stage 1 front hubs from service using a drawdown plan. We are issuing this AD to prevent failure of the HPT stage 1 front hub, which could lead to an uncontained engine failure and damage to the airplane.
Which aircraft AD 2012-16-01 applies to
Applies only when an HPT stage 1 front hub with a listed P/N is installed (Table 1): P/N 51L601 all S/Ns; P/N 52L401 with S/N not listed in Table 5 of PW ASB PW4ENG A72-821 (7/6/2012); P/N 51L201/-001/-021 all S/Ns; P/N 51L901/52L301 with S/N not listed in Table 7 of the same ASB; for PW4164/PW4164C/PW4164C-B/PW4168/PW4168A, P/N 51L901 with S/N not listed in Table 3 of PW ASB PW4G-100-A72-246 (6/28/2012).
Whether AD 2012-16-01 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.