Summary
We propose to supersede an existing airworthiness directive (AD) that applies to certain Rolls-Royce Corporation (RRC) AE 3007A series turbofan engines. The existing AD currently requires removing certain high-pressure turbine (HPT) stage 2 wheels, or performing inspections on them, and reduces their approved life limits. This proposed AD would clarify the AE 3007A turbofan engine model applicability, would further reduce the approved life limits of affected HPT stage 2 wheels, and would eliminate the inspections required by the existing AD. We are proposing this AD to prevent uncontained failure of the HPT stage 2 wheel, damage to the engine, and damage to the airplane.