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AD: Engine Alliance Turbofan Engines

AD NUMBER: 2013-12-02

PRODUCT: Certain Engine Alliance GP7270 and GP7277 turbofan engines.
SUBJECT: Airworthiness Directive 2013-12-02
ACTION: Final Rule

SUMMARY:  This AD was prompted by damage to the high-pressure compressor (HPC) stage 7-9 spool caused by failure of the baffle plate feature on affected HPC stage 6 disks. This AD requires initial and repetitive borescope inspections of the baffle plate feature and removal from service of the HPC stage 6 disk if the plate is missing material.

This AD also requires mandatory removal from service of these HPC stage 6 disks at the next HPC module exposure. The FAA is issuing this AD to prevent failure of the HPC stage 7-9 spool, uncontained engine failure, and damage to the airplane.

DATES: This AD is effective July 19, 2013.

FMI: AD

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