Summary
The FAA proposes to adopt a new airworthiness directive (AD) for CFM International, S.A. CFM56-5, -5B, and -7B series turbofan engines. This proposed AD would require removing from service, nine stage 3 low-pressure turbine (LPT) disks, identified by serial number (S/N). This proposed AD results from the discovery of a material nonconformity requiring removal of the disk before the certified disk life of certain stage 3 LPT disks. We are proposing this AD to prevent uncontained failure of the stage 3 LPT disk and damage to the airplane.