Summary
The FAA proposes to supersede Airworthiness Directive (AD) 2023-12-16, which applies to certain Rolls-Royce Deutschland Ltd & Co KG (RRD) Model Trent 1000 engines. AD 2023-12-16 requires an inspection of the high-pressure turbine (HPT) triple seal for excessive wear and, depending on the results of the inspection, replacement of the HPT triple seal and the intermediate-pressure turbine (IPT) disk. Since the FAA issued AD 2023-12-16, the manufacturer has developed a modification that removes the need for the inspection of the HPT triple seal. This proposed AD would continue to require an inspection of the HPT triple seal for excessive wear and, depending on the results of the inspection, replacement of the HPT triple seal and IPT disk. This proposed AD would remove certain engine serial numbers from the applicability of the existing AD. The FAA is proposing this AD to address the unsafe condition on these products.