LIST OF EFFECTIVE PAGES The effective pages to this Service Bulletin are as follows: Page Revision Number Revision Date

Bulletin 1 Sep.9/14 2 Sep.9/14 3 Sep.9/14 4 Sep.9/14 5 Sep.9/14 6 Sep.9/14 7 Sep.9/14 8 Sep.9/14 9 Sep.9/14 10 Sep.9/14 Appendix 1 1 Sep.9/14**Printed in Great Britain**



# RB.211−73−AH837 Transmittal - Page 21. Planning Information A. Effectivity Airbus A330 RB211 TRENT 768-60/15 Engines, with Fuel Tube (FW53576) fitted RB211 TRENT 768-60/16 Engines, with Fuel Tube (FW53576) fitted RB211 TRENT 772-60/15 Engines, with Fuel Tube (FW53576) fitted RB211 TRENT 772-60/16 Engines, with Fuel Tube (FW53576) fitted RB211 TRENT 772B-60/15 Engines, with Fuel Tube (FW53576) fitted RB211 TRENT 772B-60/16 Engines, with Fuel Tube (FW53576) fitted RB211 TRENT 772C-60/16 Engines, with Fuel Tube (FW53576) fitted
NOTE : Fuel Tube (FW53576) is introduced by SB 73-F343.
B. Reason Low Pressure (LP) fuel leaks from the LP fuel tube run between the Fuel/Oil Heat Exchanger (FOHE) to the LP/HP fuel pump have occurred in-service in the Trent 700 fleet. Movement of the FOHE mounts due to wear in conjunction with engine vibration 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 fretting between the exposed metal band and the fuel tubes. The fretting reduces the fuel tube outer wall thickness, which may lead to fracture of the fuel tube and the consequent fuel leak. This is inspected for by Non-Modification Service Bulletin (NMSB) 73-AH522. However a small number of P-clip tang fractures at clip point 4881 have resulted in frettage and leaks from the LP Fuel tube between the FOHE to LP/HP fuel pump prior to the next required inspection in accordance with 73-AH522. Three of the four of these failures have been confirmed to have broken tangs on the clips and the other was reported in this condition (but no hardware or photographs are available to confirm this). This NMSB is to specifically visually inspect the upper P-clip attaching feature and the bracket holding this P-clip to the oil tank. LP FUEL TUBE UPPER CLIP (CP4881) AND BRACKET INSPECTION - NON-MODIFICATION SERVICE BULLETIN - NON - MOD.73-AH837**Printed in Great Britain**



# RB.211−73−AH837 Page 1 of 10 Sep. 9/14 Sep. 9/14C. Description This NMSB is issued to recommend on-wing visual inspection of the upper P-clip (CP4881) on the LP fuel tube (FW53576) and the attaching bracket (FW26692). Advise your local Rolls-Royce representative of NMSB accomplishment and any significant inspection results in the table provided (Appendix 1) or similar, and provide to Rolls-Royce. D. Compliance
ALERT This Non-Modification Service Bulletin is anticipated to be subject of an EASA/FAA Airworthiness Directive. (1) On-wing Complete the actions detailed in 3.A. Accomplishment Instructions at the following intervals: (a) Inspect within the next 800 operating hours from initial issue of this NMSB. (b) Following the initial inspection, repeat the inspection at intervals not exceeding 800 hours. (2) In-shop Not applicable, as NMSB 73-AH522 includes replacement of CP 4881 at every shop visit. Embodiment of 73-AH522 can be used as compliance for NMSB 73-AH837. E. Approval The technical content of this Non-Modification Service Bulletin was approved under the authority of Design Organisation Approval EASA.21J.035 on Aug.29/14. F. Manpower (1) On-wing (a) Time to gain access 0.5 hours (2 persons) (b) Time to inspect 0.25 hours (1 person)**Printed in Great Britain**



# RB.211−73−AH837 Page 2 Sep. 9/14 Sep. 9/14(c) Time to restore to serviceable condition 0.5 hours (2 persons) (2) In-shop Not applicable
NOTE : The parts affected by this Non-Modification Service Bulletin are accessible at in-shop G. Material Price and Availability Not affected. H. Tooling Price and Availability Special tools are not required. I. References (1) Rolls-Royce RB211 Service Bulletin: 73-F343 Fuel - Fuel Tubes - LP Compressor Case - Introduction of revised LP Fuel Tube Assemblies, Associated Bracketry and Clipstacks (2) Rolls-Royce RB211 Non-Modification Service Bulletin: 73-AH522 LP Fuel Tubes, Clips, and FOHE Mounting Hardware - Inspection for Frettage - Non-Modification Service Bulletin (3) Airbus A330 Aircraft Maintenance Manuals (a) 71-13-00-010-805-A, Open the Fan Cowl Doors (b) 71-13-00-410-805-A, Close the Fan Cowl Doors (4) Aircraft Illustrated Parts Catalogue: (a) 73-12-41, Pump - Fuel (b) 79-21-41, Pump - Lubrication and Scavenge Oil**Printed in Great Britain**



# RB.211−73−AH837 Page 3 Sep. 9/14 Sep. 9/142. Material Information A. The following parts may be required if rejected during inspection: 73-11-47
FIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. 05100 FW53576 1 Tube, Assy Fuel-FCOC to Line Disconnect - FW26590/ FK30382 05108 AS43013- 134 1 Ring - - 05116 AS43013- 127 1 Ring, 36.17 mm I/D x 2.62 mm - - 05125 AS48409 3 Bolt, 0.190 in. dia x 0.562 in. - - 05126 K8831 3 Washer, 0.190 in. Dia x 0.51 mm thk - - 05128 AS62424 3 Clip, 38.10 mm (1.500 in.) - AS62426 05131 AS12943 3 Washer, 0.190 in. Dia - - 05132 AS20624 3 Nut, 0.190 in.dia - - 79-11-11
FIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. 01035 FW26692 1 Bracket, clipping oil tank top - flange - -**Printed in Great Britain**



# RB.211−73−AH837 Page 4 Sep. 9/14 Sep. 9/143. Accomplishment Instructions A. On-wing

Inspect the P-clip CP4881 and the bracket supporting the P-clip CP4881.
WARNING : YOU MUST BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE IS SHUTDOWN. THE ENGINE PARTS CAN STAY HOT FOR ALMOST 1 HOUR.
WARNING : YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE AN INJURY. IF YOU GET AN INJURY PUT IT IN COLD WATER FOR 10 MINUTES AND GET MEDICAL AID. CAUTION : IN ORDER TO REDUCE THE POTENTIAL FOR MULTIPLE ENGINE IN FLIGHT SHUTDOWN, POWER LOSS OR OTHER ANOMALIES DUE TO MAINTENANCE ERROR, ROLLS-ROYCE RECOMMENDS THAT OPERATORS AVOID PERFORMING MAINTENANCE ON MULTIPLE ENGINES INSTALLED ON THE SAME AIRCRAFT AT THE SAME TIME. IF IT IS NOT POSSIBLE TO AVOID MAINTENANCE ON MORE THAN ONE ENGINE AT THE SAME TIME, ROLLS-ROYCE RECOMMENDS THAT ADDITIONAL CONTROLS ARE APPLIED IN ORDER TO ENSURE THAT MAINTENANCE TASKS HAVE BEEN COMPLETED AS DEFINED. MAINTENANCE GUIDELINES SHOULD BE REVISED, WHERE POSSIBLE, TO PROMOTE THIS RECOMMENDATION. (1) Get access: (a) Open the fan cowl doors in accordance with Aircraft Maintenance Manual (AMM) Task 71-13-00-010-805-A. (i) For 4030EM1 (POWERPLANT-DEMOUNTABLE, ENG 1): 415AL 416AL (ii) For 4030EM2 (POWERPLANT-DEMOUNTABLE, ENG 2): 425AL 426AR (b) Put suitable access platform into a safe position. (2) Visually inspect without removing any parts, the upper most clipstack (CP4881) on the FOHE to HP fuel pump fuel pipe upper section (FW53576) and the bracket that this P-clip is attached to for damage. Refer to Fig.1, Fig.2 and Fig.3.
NOTE : If one or more P-clips are removed then refit using only new P-clips, do not refit previously installed P-clips. (a) Visually check this clip for obvious evidence that the visible metal bands through which the bolt (AS48409) is inserted are cracked or fractured. Refer to Fig.3a. (i) If the clip is not cracked - Do not disturb the assembly, go to step 3.A.(2)(b).**Printed in Great Britain**



# RB.211−73−AH837 Page 5 Sep. 9/14 Sep. 9/14(ii) If the clip is cracked/fractured remove the clip and inspect the fuel tube in accordance with step 3.A.(2)(c). (1) If the fuel tube is found to be unserviceable, remove and replace fuel tube(s) in accordance with Aircraft Maintenance Manual 70-12-01. (b) Visually check the bracket (FW26692) for obvious evidence of wear or damage, specifically check that the P-clip (CP4881) bolt area is in good condition. Refer to Fig.3b. (i) If the bracket is not cracked - Do not disturb the assembly, go to step 3.A.(3). (ii) If the bracket is cracked/fractured remove and replace the bracket and inspect the fuel tube in accordance with step 3.A.(2)(c). This may be carried out within the next 100 operating hours if the clip is not damaged. (1) If the fuel tube is found to be unserviceable, remove and replace fuel tube(s) in accordance with Aircraft Maintenance Manual 70-12-01. (c) Fuel tube acceptance and rejection criteria:
Contact frettage under clip location to a depth of greater than 0.2 mm (0.008 in.) Reject

NOTE : 1. Use AMM Limits for any other damage on the tube. 2. Take particular care to inspect the entire exposed surface of the tube, a mirror may be used in areas where direct line of sight access is difficult. (d) If a clip or fuel tube is rejected, remove and replace it in accordance with Aircraft Maintenance Manual 70-12-01. If one or more P-clips are removed then refit using only new P-clips, do not refit previously installed P-clips. (e) Refer to Service Bulletin 73-F343 for specific installation instructions, the Standard Practices Manual (SPM) 70-51-00 for bolt torque details and Fig.3 for tube and clipping point details.
NOTE : During removal of the clip look for any significant relaxation of strain that suggests poor alignment of the tube and stressing of certain clipping positions. If necessary, loosen adjacent clips and carefully manipulate the tube alignment to minimise any strain in the system. Make a note on the proforma (Appendix 1) if alignment issues are seen.**Printed in Great Britain**



# RB.211−73−AH837 Page 6 Sep. 9/14 Sep. 9/14(3) Close the fan cowl doors; refer to Aircraft Maintenance Manual (AMM) Task 71-13-00-410-805-A. (a) For 4030EM1 (POWERPLANT-DEMOUNTABLE, ENG1): 415AL 416AL (b) For 4030EM2 (POWERPLANT-DEMOUNTABLE, ENG2): 425AL 426AR (4) Remove the access platform. (5) If any fuel tube was replaced then do a fuel and oil leak test in accordance with Aircraft Maintenance Manual, 71-00-00, Test No.2, The Fuel and Oil Leak Test. B. In Shop

Not applicable C. A record of accomplishment is required, Refer to Appendix 1.**Printed in Great Britain**



# RB.211−73−AH837 Page 7 Sep. 9/14 Sep. 9/14General Fuel Tube Arrangement Fig.1**Printed in Great Britain**



# RB.211−73−AH837 Page 8 Sep. 9/14 Sep. 9/14Arrangement of Fuel Tubes FW53577 and FW53576 Fig.2**Printed in Great Britain**



# RB.211−73−AH837 Page 9 Sep. 9/14 Sep. 9/14Arrangement and Example of Fracture of Clip Position CP4881 Fig.3**Printed in Great Britain**



# RB.211−73−AH837 Page 10 Sep. 9/14 Sep. 9/14This form (or similar) to be completed for every engine/component inspected. Results to be sent to Rolls-Royce via your Service Representative Feedback Sheet NMSB 73-AH837 Date: Operator: Engine Serial No. Aircraft: Hours Cycles Engine Life: Life Since Last Shop Visit: Fuel Tubes Condition Observations (material transfer/fretted/dented/worn - please specify depth)

FW53576

FW53577
Clips Condition Observations (material transfer/dust/worn/cracked/metal band exposed)

4881

2607

2427

Bracket Condition Observations (material transfer/dust/worn/cracked)

FW26692

Notes:

NOTE : Only those components which are inspected need to be reported on this form. APPENDIX 1**Printed in Great Britain**



# RB.211−73−AH837 Appendix 1 - Page 1 of 1 Sep. 9/14 Sep. 9/14