Airworthiness Directives; GE Aviation Czech s.r.o. Turboprop Engines

We are adopting a new airworthiness directive (AD) for GE Aviation Czech s.r.o. M601D-11, M601E-11, M601E-11A, M601E-11AS, M601E- 11S, and M601F turboprop engines. This AD requires removal of certain power turbine (PT) disks installed on the affected engines. This AD was prompted by a design review by the manufacturer that determined PT rotors with certain disks have less overspeed margin than originally stated during product certification. We are issuing this AD to address the unsafe condition on these products.