Airworthiness Directive · Amendment 39-17289 · Rolls-Royce plc Turbofan Engines
Rolls-Royce plc Turbofan Engines
This AD applies to Rolls-Royce plc (RR) RB211 Trent 768-60, 772-60, and 772B-60 turbofan engines with serial numbers (S/Ns) listed in Table 1 to paragraph (c) of this AD.
| 41221 | 41435 | 41446 | 41459 | 41465 |
| 41425 | 41437 | 41451 | 41460 | 41466 |
| 41428 | 41438 | 41452 | 41461 | 41468 |
| 41430 | 41440 | 41454 | 41462 | 41469 |
| 41431 | 41442 | 41455 | 41463 | 41470 |
| 41432 | 41445 | 41456 | 41464 | 41471 |
We are adopting a new airworthiness directive (AD) for certain serial numbers (S/Ns) of Rolls-Royce plc (RR) RB211-Trent 768-60, 772- 60, and 772B-60 turbofan engines. This AD requires initial and repetitive on-wing or in-shop inspections of the high pressure/ intermediate pressure (HP/IP) turbine bearing support oil feed tube outer heat shield. This AD also requires installation of a revised HP/ IP turbine bearing support structure as terminating action to the repetitive inspections of the HP/IP turbine bearing support oil feed tube outer heat shield. This AD was prompted by a report of high oil consumption due to an oil leak from the HP/IP turbine bearing support oil feed tube. We are issuing this AD to prevent failure of the HP turbine disc, uncontained engine failure, and damage to the airplane.
Unless already done, do the following actions.
(1) Initially inspect the HP/IP turbine bearing support oil feed tube within the compliance times specified in paragraphs 1.D.(1)(a) through 1.D.(1)(a)(ii) of RR Alert Service Bulletin (ASB) No. RB.211-72-AG873, dated February 27, 2012. Perform the initial inspection in accordance with paragraphs 3.A (1)(a) through 3.A (1)(j) of RR ASB No. RB.211-72-AG873, dated February 27, 2012.
(2) If the HP/IP turbine bearing support oil feed tube outer heat shield is not present, accept the module as compliant. No further action is required.
If the HP/IP turbine bearing support oil feed tube outer heat shield is present, perform repetitive inspections of the HP/IP turbine bearing support oil feed tube, in accordance with paragraphs 3.A (2)(b) through 3.A (2)(f) of RR ASB No. RB.211-72-AG873, dated February 27, 2012.
As mandatory terminating action to the repetitive inspections required by this AD, install a revised HP/IP turbine bearing support structure, at the next 05 Module overhaul after the effective date of this AD, in accordance with either:
(1) Sections 3.B (1)(a) through 3.B (1)(f) of RR Service Bulletin (SB) No. RB.211-72-F117, Revision 2, dated September 25, 2006; or
(2) Sections 3.B (1)(a) through 3.B (1)(e) and 3.B (2)(a) of RR SB No. RB.211-72-F227, Revision 1, dated October 8, 2007.
For the purpose of this AD, “next 05 Module overhaul” is any time that the HP/IP turbine internal oil tubes have been exposed and the HP/IP turbine bearing support oil feed tube heat shields are subjected to visual inspection.
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.
