Summary
The FAA proposes to supersede an existing airworthiness directive (AD) for Rolls-Royce plc (RR) models RB211-535E4-37, RB211- 535E4-B-37, RB211-535C-37, RB211-535E4-B-75, RB211-535E4-C, and RB211- 22B-02 turbofan engines. That AD currently requires inspecting certain high pressure (HP) turbine discs, manufactured between 1989 and 1999, for cracks in the rim cooling air holes, and, if necessary, replacing the discs with serviceable parts. This proposed AD would require the same inspections, and would reduce the compliance times for eddy current inspection (ECI) for the RR RB211-22B-02 engines. This proposed AD results from the manufacturer reducing their recommended compliance times for inspections on RB211-22B-02 engines. We are proposing this AD to prevent possible disc failure, which could result in an uncontained engine failure and damage to the airplane.