AD NUMBER: 2019-20-05

PRODUCT: Certain RollsRoyce plc (RR) Trent 1000-A, Trent 1000-C, Trent 1000-D, Trent 1000-E, Trent 1000-G, Trent 1000-H, Trent 1000-A2, Trent 1000-C2, Trent 1000-D2, Trent 1000-E2, Trent 1000-G2, Trent 1000- H2, Trent 1000-J2, Trent 1000-K2, and Trent 1000-L2 model turbofan engines.

ACTION: Final rule; request for comments.

SUMMARY: The FAA is superseding airworthiness directive (AD) 2018-15-01 for the engines listed above.

AD 2018-15-01 required certain engines susceptible to intermediate-pressure turbine (IPT) blade failure not be installed on an airplane together with other engines with IPT blades of the same cyclic life.

This AD requires removal of the IPT blade set at lower cyclic life limits and replacing it with a blade set eligible for installation.

This AD also expands the applicability to include additional Trent 1000 turbofan engine models. This AD was prompted by the determination that certain IPT blades are susceptible to shank corrosion which leads to cracking and possible blade separation.

DATES: This AD is effective October 30, 2019. The FAA must receive any comments on this AD by November 29, 2019.

COST: The FAA estimates that this AD affects 0 engines installed on airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD In the event an affected engine becomes installed on a U.S.-registered product:

• Replace IPT blades - Labor: 48 work-hours × $85 per hour = $4,080 per engine
• Parts: $100,000 per engine.
• Total cost per engine: $104,080.

FMI: AD