Summary
The FAA proposes to adopt a new airworthiness directive (AD) for GE CF6-80A series turbofan engines with certain stage 1 high- pressure turbine (HPT) rotor disks, installed. This proposed AD would require removal from service of those stage 1 HPT rotor disks within 30 days after the effective date of the AD. This proposed AD results from the FAA learning that those disks are susceptible to cracks developing in the bottoms of the dovetail slots. We are proposing this AD to prevent cracks developing in the bottoms of the dovetail slots that could propagate to a failure of the disk and cause an uncontained engine failure and damage to the airplane.