Airworthiness Directive · Amendment 39-11888 · Rolls-Royce plc RB211-524D4 Series Turbofan Engines
Rolls-Royce plc RB211-524D4 Series Turbofan Engines
This airworthiness directive (AD) applies to Rolls-Royce plc (RR) models RB211-524D4-19, -524D4B-19, -524D4-B-39, -524D4X-19, and -524D4X-B-19 turbofan engines with cold stream nozzle assembly Part Number (PN) LJ32826 installed. These engines are installed on, but not limited to, Boeing 747-200 and -300 series airplanes.
Note 1: This AD applies to each engine identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For engines that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (d) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD) that is applicable to Rolls-Royce plc models RB211-524D4-19, -524D4-B-19, - 524D4-B-39, -524D4X-19, and 524D4X-B-19 turbofan engines with a cold stream nozzle assembly Part Number (PN) LJ32826 installed. This action requires inspection for cracks and repair of the cold stream nozzle assembly longitudinal flange. This amendment is prompted by a report of the loss of a large section of cold stream nozzle assembly in flight. The actions specified in this AD are intended to detect cracks that could result in failure of the cold stream nozzle assembly, possible release of cold stream nozzle debris from the engine, and possible damage to airplane control surfaces.
(a) Inspect cold stream nozzle assemblies for cracks within 60 days or 100 cycles-in-service (CIS) after the effective date of this AD, whichever is sooner, in accordance with the Accomplishment Instructions, Sections 3.A through 3.C.(3) of RR Service Bulletin (SB) RB.211-78-C955, Revision 1, dated June 20, 2000.
(b) Thereafter, inspect each nozzle assembly for cracks within 1400 CIS since last inspection in accordance with Accomplishment Instructions, Sections 3.A. through 3.C.(3) of RR SB RB.211-78-C955, Revision 1.
(c) Repair of cold stream nozzle assemblies PN LJ32826 on both left and right sides in accordance with RR SB RB.211-78-C955, Revision 1, dated June 20, 2000, is considered terminating action for the repetitive inspection requirements of this AD.
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.
Engines
