Airworthiness directives › 2003-16-18
AD 2003-16-18 Airworthiness Directives; Rolls-Royce plc RB211 Trent 800 Series Turbofan Engines
Applicability*9
This AD applies to Rolls-Royce plc (RR) RB211 Trent 875-17, Trent 877-17, Trent 884-17, Trent 892-17, Trent 892B-17, and Trent 895-17 turbofan engines with intermediate pressure (IP) turbine discs part numbers (P/Ns) FK21117 and FK33083 installed. These engines are installed on, but not limited to Boeing 777 airplanes.
Compliance
You are responsible for having the actions required by this AD performed within the compliance cycles specified unless the actions have already been done. (f) To prevent uncontained IP turbine disc failure and damage to the airplane, do the following: (1) Remove IP turbine disc P/N FK21117 from service at or before accumulating 8,600 cycles-since-new (CSN), and remove IP turbine disc P/N FK33083 from service at or before accumulating 3,000 CSN. Information on the reduced life limits may be found in Rolls-Royce Mandatory Service Bulletin RB.211-72-E058, dated January 14, 2003. (2) After the effective date of this AD, do not install any IP turbine disc P/N FK21117, that exceeds 8,600 CSN, or any IP turbine disc P/N FK33083, that exceeds 3,000 CSN. Alternative Methods of
Unsafe condition
This AD is prompted by reports of two IP turbine blade release incidents as a result of dust caps separating from the blades. Subsequently, the manufacturer applied improved modeling techniques for analysis, which revealed higher than predicted operating temperatures at the IP turbine disc rim and surrounding area due to inflow of annulus exhaust gases. The actions specified in this AD are intended to prevent uncontained IP turbine disc failure and damage to the airplane.
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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