Airworthiness directives › 2007-02-06
AD 2007-02-06 Airworthiness Directives; Pratt & Whitney PW2000 Series Turbofan Engines
Applicability*9
This AD applies to Pratt & Whitney PW2037, PW2040, and PW2037M turbofan engines. These engines are installed on, but not limited to Boeing 757 airplanes.
Compliance
You are responsible for having the actions required by this AD performed at the next shop visit, not to exceed an additional 6,000 engine cycles, after the effective date of this AD, when the 8th stage HPC drum rotor disk assembly (compressor blades installed) is exposed and removed from the HPC module, unless the actions have already been done. Inspect the 8th Stage Drum Rotor Disk (f) Inspect the 8th stage drum rotor disks listed by part numbers and serial numbers in Table 1 of the Accomplishment Instructions of Pratt & Whitney Alert Service Bulletin No. PW2000 A72-706, dated February 17, 2006, as follows: (1) Do a onetime focused visual and fluorescent penetrant inspection (FPI) of suspect 8th stage HPC drum rotor disk assemblies that may have been damaged during manufacture. (2) Use paragraphs 3., 3.A., and 3.B. of the Accomplishment Instructions of Pratt & Whitney Alert Service Bulletin No. PW2000 A72-706, dated February 17, 2006, Nondestructive Inspection Procedure (NDIP) 1096, dated January 19, 2006, and NDIP 1095, dated January 12, 2006, to do the inspections. (3) Any 8th stage disk damage that exceeds the serviceable limits specified in Pratt & Whitney PW2000 Engine Manual, Part Number 1A6231, Chapter/Section 72-35-03, Inspection/Check-01/-04, can not be returned to service. (g) After the effective date of this AD, do not install any uninspected 8th stage drum rotor disk assemblies listed in Table 1 of the Accomplishment Instructions of Pratt & Whitney Alert Service Bulletin No. PW2000 A72-706, dated February 17, 2006, in any engine. Alternative Methods of
Unsafe condition
This AD results from a Pratt & Whitney PW2037 8th stage high-pressure compressor (HPC) drum rotor disk assembly failure event caused by tooling damage that occurred during disk assembly manufacture. We are issuing this AD to prevent 8th stage HPC drum rotor disk assembly failure that could result in an uncontained engine failure and damage to the airplane.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1