Airworthiness Directive · Amendment 39-11535 · Rolls-Royce plc RB211 Trent 768-60, 772-60, and 772B-60 Series Turbofan Engines
Rolls-Royce plc RB211 Trent 768-60, 772-60, and 772B-60 Series Turbofan Engines
Rolls-Royce plc (R-R) RB211 Trent Rolls-Royce plc (R-R) RB211 Trent 768-60, 772-60, and 772B-60 series turbofan engines, installed on but not limited to Airbus Industrie A330-341 and A330-342 series airplanes.
Note 1: This airworthiness directive (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 (c) 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 RB211 Trent 768-60, 772-60, and 772B- 60 series turbofan engines. This action requires initial and repetitive visual inspections for flank wear on intermediate pressure turbine (IPT) shaft splines and intermediate pressure compressor (IPC) rear stub shaft splines. Components that show excessive flank wear must be replaced with serviceable parts. This amendment is prompted by reports of worn IPT shaft splines discovered at overhaul. The actions specified in this AD are intended to prevent IPT and IPC shaft spline flank wear, which could result in loss of drive between the IPT and IPC, leading to an IPT overspeed and possible disk burst, uncontained engine failure, and potential damage to the aircraft.
To prevent intermediate pressure turbine (IPT) and intermediate pressure compressor (IPC) shaft spline flank wear, which could result in loss of drive between the IPT and IPC, leading to an IPT overspeed and possible disk burst, uncontained engine failure, and potential damage to the aircraft, accomplish the following:
(a) Visually inspect for flank wear on IPT shaft splines and intermediate pressure compressor IPC rear stub shaft splines in accordance with Paragraph D, Action, of R-R Mandatory Service Bulletin (SB) No. RB.211-72-C329, Revision 1, dated November 6, 1998, as follows:
(1) Initially inspect prior to accumulating 4,200 cycles-since-new.
(2) Thereafter, inspect at intervals not to exceed 4,200 cycles-in-service since last inspection.
(b) If spline wear depth exceeds the limits referred to in paragraph D (h)(vi) of R-R Mandatory SB No. RB.211-72-C329, Revision 1, dated November 6, 1998, prior to further flight remove from service worn components and replace with serviceable parts.
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.
