This document transmits Revision 3 to Service Bulletin RB211-73-G848 Document History Service Bulletin Revision Status Supplement Revision Status Initial Issue Mar.30/12 Revision 1 Jan.21/13 Revision 2 Sep.20/13 Bulletin Revision 3 Remove Incorporate Reason for change All pages of the Service Bulletin Page 1 and 2 of the Service Bulletin To cancel Non-Modification Service Bulletin 73-G848 All pages of Appendix 1 To cancel Non-Modification Service Bulletin 73-G848 All pages of Appendix 2 To cancel Non-Modification Service Bulletin 73-G848**Printed in Great Britain** Jun.12/14

RB211 TRENT 700 SERIES PROPULSION SYSTEM NON-MODIFICATION SERVICE BULLETIN



# RB.211−73−G848 Transmittal - Page 1 of 2 DateLIST OF EFFECTIVE PAGES The effective pages to this Service Bulletin following incorporation of Revision 3 are as follows: Page Revision Number Revision Date

Bulletin R 1 3 Jun.12/14 R 2 3 Jun.12/14**Printed in Great Britain**



# RB.211−73−G848 Transmittal - Page 21. Planning Information A. Effectivity Airbus A330 RB211 TRENT 768-60/15 Engines RB211 TRENT 768-60/16 Engines RB211 TRENT 772-60/15 Engines RB211 TRENT 772-60/16 Engines RB211 TRENT 772B-60/15 Engines RB211 TRENT 772B-60/16 Engines RB211 TRENT 772C-60/15 Engines RB211 TRENT 772C-60/16 Engines
B. Reason Low-pressure (LP) fuel leaks from the LP fuel tubes between the combined LP/HP (High Pressure) Fuel Pump and the Fuel/Oil Heat Exchanger (FOHE), and FOHE to LP/HP fuel pump have occurred in-service in the Trent 700 fleet. Movement of the FOHE mounts due to wear allows the fuel tubes to move excessively within the clipping points. This has resulted in excessive wear of the rubber section of the P-Clips, and the subsequent frettage between the exposed metal band and the fuel tubes. The frettage reduces the fuel tube outer wall thickness, leading to fracture of the fuel tube and the consequent fuel leak. This may cause the leakage of significant amounts of fuel and can cause IFSD and diversion events. This Non-Modification Service Bulletin (NMSB) is designed to address the condition on in-shop engines. Revision 1 of this NMSB was issued to; Section 2. Material Information, rectify an incorrect part number at 72-35-16, Fig./Item 05500; Section 3. Accomplishment Instructions, to correct IPC Fig/Item reference in para 3.A.(4)(a)(iii), remove incorrect torque loading instruction para 3.A.(4)(a)(v) and minor non-technical changes to improve the clarity of the acceptance criteria tables. Revision 2 of this NMSB was R issued to advise that this inspection was applicable to all engines in-shop. TRENT 700 - LP FUEL TUBES, CLIPS, AND FOHE MOUNTING HARDWARE - INSPECTION FOR FRETTAGE - NON-MODIFICATION SERVICE BULLETIN - MOD.73-G848**Printed in Great Britain**



# RB.211−73−G848 Page 1 of 2 Mar 30/12 R Jun.12/14Revision 3 of this NMSB is issued to advise that Rolls-Royce has confirmed that the requirement to inspect the LP fuel tubes, clips and FOHE mounting hardware has been revised and defined in NMSB 73-AH522 for both in-shop and on-wing. R R R Non-Modification Service Bulletin 73-G848 is therefore cancelled. R C. Approval Rolls-Royce R Non-Modification Service Bulletin 73-G848 was cancelled under the authority of Design Organisation Approval EASA.21J.035 on Mar.31/14. R D. References Rolls-Royce RB211 Service Bulletin: R RB211-73-AH522 R Trent 700 - LP fuel tubes, clips, and FOHE mounting hardware - Inspection for frettage - Non-Modification Service Bulletin. R R 2. Material Information
None. R 3. Accomplishment Instructions
None. R**Printed in Great Britain**



# RB.211−73−G848 Page 2 Mar 30/12 R Jun.12/14