Summary
We propose to adopt a new airworthiness directive (AD) for certain GE Aviation Czech s.r.o. M601D-11, M601E-11, M601E-11A, M601E- 11AS, M601E-11S, and M601F turboprop engines. This proposed AD was prompted by a review that determined that certain power turbine (PT) rotors have less overspeed margin than originally declared during product certification. This proposed AD would require removal of the affected PT disks. We are proposing this AD to correct the unsafe condition on these products.