Airworthiness Directive · Amendment 39-16048 · Rolls-Royce plc RB211 Trent 800 Series Turbofan Engines
Rolls-Royce plc RB211 Trent 800 Series Turbofan Engines
This AD applies to Rolls-Royce plc RB211 Trent 875-17, Trent 877-17, Trent 884-17, Trent 892-17, Trent 892B-17, and Trent 895-17 turbofan engines with high-pressure (HP) compressor rotor rear stage 5 and 6 discs and cone shafts, part numbers FK25230 and FK27899 installed. These engines are installed on, but not limited to, Boeing 777 series airplanes.
The FAA is superseding an existing airworthiness directive (AD) for Rolls-Royce plc RB211 Trent 875-17, Trent 877-17, Trent 884- 17, Trent 892-17, Trent 892B-17, and Trent 895-17 turbofan engines with high-pressure (HP) compressor rotor rear stage 5 and 6 discs and cone shafts, part numbers (P/Ns) FK25230 and FK27899 installed. That AD currently requires removal from service of these HP compressor rotor rear stage 5 and 6 discs and cone shafts before reaching newly reduced life limits. This AD requires removing these parts at new reduced cycle limits. This AD results from Rolls-Royce plc reducing the lives of these parts and changing the life calculating method to use "Standard Duty Cycles" with "Multiple Flight Profile Monitoring" and "Flight Cycles" with "Heavy Flight Profile Monitoring". We are issuing this AD to prevent stage 5 and 6 disc crack initiation and propagation that might lead to uncontained disc failure and damage to the airplane.
You are responsible for having the actions required by this AD performed within the compliance times specified unless the actions have already been done.
(f) For operators using “Multiple Flight Profile Monitoring” (Flight Profiles “A” through “F”), remove HP compressor rotor rear stage 5 and 6 discs and cone shafts from service at or before accumulating 5,000 “Standard Duty Cycles”. Guidance on “Multiple Flight Profile Monitoring” can be found in the Aircraft Maintenance Manual, Chapter 70-01-10.
(g) For operators using “Heavy Flight Profile Monitoring”, remove HP compressor rotor rear stage 5 and 6 discs and cone shafts from service at or before accumulating 5,000 “Flight Cycles”. Guidance on “Heavy Flight Profile Monitoring” can be found in the Aircraft Maintenance Manual, Chapter 70-01-10.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
