Airworthiness directives › 2012-13-02
AD 2012-13-02 Airworthiness Directives; Pratt & Whitney Turbofan Engines
Applicability*9
This AD applies to Pratt & Whitney Division PW4074 and PW4077 turbofan engines with 15th stage high-pressure compressor (HPC) disks, part number (P/N) 55H615, installed.
Compliance
The Manager, Engine Certification Office, may approve AMOCs for this AD. Use the procedures found in 14 CFR 39.19 to make your request.
Required actions
For more information about this AD, contact Ian Dargin, Aerospace Engineer, Engine Certification Office, FAA, 12 New England Executive Park, Burlington, MA 01803; phone: 781-238-7178; fax: 781-238-7199; email: ian.dargin@faa.gov.
Unsafe condition
Comply with this AD within the compliance times specified, unless already done. To perform the inspections, use paragraph 1.A. or 1.B. of the Accomplishment Instructions “For Engines Installed on the Aircraft” or 1.A. or 1.B. of the Accomplishment Instructions “For Engines Removed from the Aircraft,” of Pratt & Whitney Service Bulletin PW4G-112-72-309, Revision 1, dated July 1, 2010. (1) For 15th stage HPC disks that have 9,865 or fewer cycles since new (CSN) on the effective date of this AD, remove the disk from service before accumulating 12,000 CSN. (2) For 15th stage HPC disks that have accumulated more than 9,865 CSN on the effective date of this AD, do one of the following: (i) Remove the disk from service at the next piece-part exposure, not to exceed 2,135 cycles-in-service (CIS) after the effective date of this AD. (ii) Perform a borescope inspection (BSI) or eddy current inspection (ECI) of the front rail of the disk outer rim according to the following schedule: (A) Within 2,400 cycles-since-last fluorescent penetrant inspection or ECI, or (B) Within 1,200 cycles-since-last BSI, or (C) Before accumulating 12,000 CSN, or (D) Within 55 CIS after the effective date of this AD, whichever occurs latest. (3) If the BSI from paragraph (e)(2)(ii) of this AD indicates the presence of a crack in the disk outer rim front rail, but you cannot visually confirm a crack, perform an ECI within 5 CIS after the BSI. (4) If you confirm a crack in the front rail of the disk outer rim using any inspection method, remove the disk from service before further flight.
Affected ADs
This AD supersedes AD 2011-14-07, Amendment 39-16742 (76 FR 47056, August 4, 2011).
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