Summary
We propose to adopt a new airworthiness directive (AD) for all Rolls-Royce Deutschland Ltd & Co KG (RRD) model Tay 650-15 turbofan engines. This proposed AD was prompted by excessive deterioration of the high-pressure (HP) air bleed valve operating mechanism. This proposed AD would require a one-time inspection of the HP air bleed valve operating mechanism and, depending on findings, corrective action. We are proposing this AD to prevent multiple fan blade failure, which could result in uncontained engine failure and damage to the airplane.