Airworthiness directives › 2009-21-09
AD 2009-21-09 Airworthiness Directives; Rolls-Royce plc RB211 Trent 800 Series Turbofan Engines
Applicability*9
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.
Compliance
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. Alternative Methods of
Unsafe condition
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.
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TrackAD holds all 12,278 of them and matches them against the aircraft you actually look after — airframe, engine, propeller and appliances in one pass — then works out what falls due and when.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1