AD NUMBER: 2020-05-01

PRODUCT: All Rolls-Royce Deutschland Ltd. & Co KG (RRD) Trent 1000-AE3, Trent 1000-CE3, Trent 1000-D3, Trent 1000- G3, Trent 1000-H3, Trent 1000-J3, Trent 1000-K3, Trent 1000-L3, Trent 1000-M3, Trent 1000-N3, Trent 1000-P3, Trent 1000-Q3, and Trent 1000-R3 model turbofan engines.

ACTION: Final rule; request for comments.

SUMMARY: This AD requires initial and repetitive borescope inspections (BSI) of the high-pressure turbine (HPT) blades.

This AD also requires replacement of HPT blades with parts eligible for installation when the HPT blades fail inspection or reach the new life limit.

his AD was prompted by the manufacturer identifying that the HPT blades may fail prematurely.

DATES: This AD is effective March 25, 2020. The FAA must receive comments on this AD by April 24, 2020.

COST: The FAA estimates that this AD affects no airplanes of U.S. registry. Operators may incur the following costs in order to comply with this AD:

• BSI the HPT blades: 4 work-hours × $85 per hour = $340 per engine.
• Replace the HPT blade set:
  • Labor: 1,250 work-hours × $85 per hour = $106,250.
  • Parts: $1,871,100.
  • Cost per Airplane: $1,977,350.

FMI: AD