FAA 2020-15-03

Requires an inspection of the engine power turbine disk and, if found damaged, its replacement with a part eligible for installation. AD also requires the removal of certain engine power turbine disks identified by P/N installed on the affected engines. Prompted by the discovery of damage to certain engine power turbine disks and a review by the manufacturer that determined that certain engine power turbine rotors have less overspeed margin than originally declared during product certification.