Summary
The FAA proposes to supersede Airworthiness Directive (AD) 2025-26-03, which applies to certain Rolls-Royce Deutschland Ltd & Co KG (RRD) Model Trent 1000-A, Trent 1000-AE, Trent 1000-C, Trent 1000- CE, Trent 1000-D, Trent 1000-E, Trent 1000-G, and Trent 1000-H engines. AD 2025-26-03 requires repetitive borescope inspections (BSIs) of the high-pressure compressor (HPC) rear drum cavity and cavities between each HPC rotor disc, and depending on the results of inspection, removal of the engine from service. AD 2025-26-03 also allows an alternative method of complying with the repetitive BSIs if certain actions are accomplished. Since the FAA issued AD 2025-26-03, RRD published updated service material with a revised bolting arrangement at the HPC rotor shaft to high-pressure turbine (HPT) rotor disc interface to address the unsafe condition. This proposed AD would require repetitive BSIs of the HPC rear drum cavity and cavities between each HPC rotor disc, and depending on the results of inspection, removal of the engine from service. This proposed AD would also allow an alternative method of complying with BSIs if certain actions are accomplished, and require modification of the bolting arrangement as a terminating action for the repetitive BSIs. The FAA is proposing this AD to address the unsafe condition on these products.