Airworthiness directives › 2003-21-11
AD 2003-21-11 Airworthiness Directives; Rolls-Royce plc RB211-524 Series Turbofan Engines
Applicability*9
This AD applies to the Rolls-Royce plc (RR) engines in the following Table 1, with the dedicated generator rotor assembly, part number (P/N) UL39102, adaptor casing P/N UL26756 or UL26729, on the high speed gearbox (HSGB), and bearings P/N UL21029 installed. Table 1.—Affected Engines and Compliance Times Engine model Engine serial numbers Comply after the effective date of this AD RB211-524G2-19 Before SN 13793 Within 62 months. RB211-524G2-T-19 All SNs Within 62 months. RB211-524G3-19 Before SN 13793 Within 62 months. RB211-524G3-T-19 All SNs Within 62 months. RB211-524H2-19 Before SN 13793 Within 62 months. RB211-524H2-T-19 All SNs Within 62 months. RB211-524H-36 Before SN 13472 Within 16 months. RB211-524H-T-36 All SNs Within 16 months. These engines are installed on, but not limited to, Boeing 747 and 767 series airplanes.
Compliance
You are responsible for having the actions required by this AD performed within the compliance times specified in Table 1 of this AD, unless the actions have already been done. Removal and Installation of Adaptor Gearbox and Dedicated Generator On Engines In-Service (f) For engines in-service, do the following: (1) Remove the adaptor gearbox and the dedicated generator. Follow paragraph 3.C. of the Accomplishment Instructions of RR Mandatory Service Bulletin (MSB) No. RB.211-72-E037, dated March 26, 2003. (2) Install the adaptor gearbox and the dedicated generator onto the engine. Follow paragraph 3.I. of the Accomplishment Instructions of RR MSB No. RB.211-72-E037, dated March 26, 2003. Removal, Disassembly, Rework, Assembly, and Installation of Adaptor Gearbox and Dedicated Generator On Engines At Overhaul (g) For engines at overhaul, do the following: (1) Remove the adaptor gearbox and the dedicated generator. Follow paragraph 3.D. of the Accomplishment Instructions of RR MSB No. RB.211-72-E037, dated March 26, 2003. (2) Disassemble the adaptor gearbox. Follow paragraph 3.E. of the Accomplishment Instructions of RR MSB No. RB.211-72-E037, dated March 26, 2003. (3) Rework the existing gearbox adaptor casing assemblies (P/N UL26756 or P/N UL26729). Follow paragraph 3.F. of the Accomplishment Instructions of RR MSB No. RB.211-72-E037, dated March 26, 2003. (4) Assemble the adaptor gearbox. Follow paragraph 3.H. of the Accomplishment Instructions of RR MSB No. RB.211-72-E037, dated March 26, 2003. (5) Install the adaptor gearbox and the dedicated generator onto the engine. Follow paragraph 3.J. of the Accomplishment Instructions of RR MSB No. RB.211-72-E037, dated March 26, 2003. Alternative Methods of
Unsafe condition
This AD is prompted by several reports of dedicated generator rotor assembly bearing failures. We are issuing this AD to prevent possible uncommanded engine acceleration with no reaction to throttle movement, which could result in uncontrollable asymmetric engine thrust levels during takeoff or climb.
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