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Sun, Aug 07, 2011

AD: Pratt & Whitney

AD NUMBER: 2011-14-07

MANUFACTURER: Pratt & Whitney (PW) Models PW4074 and PW4077 Turbofan Engines
SUBJECT: Airworthiness Directive 2011-14-07
ACTION: Final rule.

SUMMARY: This AD requires removing the 15th stage HPC disk within 12,000 cycles since new (CSN) or, for any disks that exceed 12,000 CSN after the effective date of this AD using a drawdown plan that includes a borescope inspection (BSI) or eddy current inspection (ECI) of the rim for cracks. This AD was prompted by multiple shop findings of cracked 15th stage HPC disks. The FAA is issuing this AD to prevent cracks from propagating into the disk bolt holes, which could result in a failure of the 15th stage HPC disk, uncontained engine failure, and damage to the airplane. This AD is effective September 8, 2011.

FMI: http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAD.nsf/0/0FCCD3B9AE1FDDBC862578E200453A51?OpenDocument

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