Summary
The FAA proposes to adopt a new airworthiness directive (AD) for General Electric Company (GE) CF6-80C2 series turbofan engines. This proposed AD would require replacing certain high pressure turbine (HPT) stage 1 disks at or before reaching a new reduced life cycle limit. This proposed AD is prompted by an updated low-cycle-fatigue (LCF) analysis of the HPT stage 1 disk. We are proposing this AD to prevent LCF cracking and failure of the HPT stage 1 disk due to exceeding the life limit, which could result in an uncontained engine failure and damage to the airplane.