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Mon, Apr 13, 2009

AD: General Electric

AD NUMBER: 2009-08-06
MANUFACTURER: General Electric
SUBJECT: Airworthiness Directive 2009-08-06
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for GE CF6-80A series turbofan engines with certain stage 1 high-pressure turbine (HPT) rotor disks, installed.

 his AD requires removal from service of those stage 1 HPT rotor disks within 30 days after the effective date of the AD.This AD results from the FAA learning that those disks are susceptible to cracks developing at the aft chamfer of the blade dovetail slots.

We are issuing this AD to prevent cracks developing at the aft chamfer of the blade dovetail slots that could propagate to a failure of the disk and cause an uncontained engine failure and damage to the airplane.

FMI: www.faa.gov/regulations_policies/airworthiness_directives/

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