Airworthiness Directives; General Electric Company (GE) CF6-45 and CF6-50 Series Turbofan Engines

摘要

The Federal Aviation Administration (FAA) proposes to adopt a new airworthiness directive (AD) that is applicable to GE CF6-45 and CF6-50 series turbofan engines. This proposal would require a reduction of the cyclic life limit for certain low pressure turbine rotor (LPTR) stage 2 disks, and would require removing certain LPTR stage 2 disks from service before exceeding the new, lower cyclic life limit. In addition, the proposal would require removing from service certain LPTR stage 2 disks that currently exceed, or will exceed, the new, lower cyclic life limit according to the compliance schedule described in this proposal. This proposal is prompted by a report of a cracked LPTR stage 2 disk found during a visual inspection. The actions specified by the proposed AD are intended to prevent an uncontained engine failure and damage to the airplane, resulting from cracks in the LPTR stage 2 disk.