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

Bulletin 1 Oct.25/12 2 Oct.25/12 3 Oct.25/12 4 Oct.25/12 5 Oct.25/12 6 Oct.25/12 Appendix 1 1 Oct.25/12 Appendix 2 1 Oct.25/12**Printed in Great Britain**



# RB.211−79−AH031 Transmittal - Page 21. Planning Information A. Effectivity Airbus A380 RB211 TRENT 970-84 Engines RB211 TRENT 972-84 Engines B. Reason Damage to the oil baffle seals in the Trent 900 Fuel Oil Heat Exchanger (FOHE) can lead to liberation of elastomeric sealing material sections into the engine oil system, Leading to oil flow restriction. The condition can then result in significant degradation of the engine oil system performance. Operational disruption has occurred as a result of this condition. As part of the ongoing service management, it is necessary to return the current standard of FOHE (Part Number 47111-1241) before it reaches 5000 engine flying hours since last unit overhaul or since new (for units not previously overhauled) for seal replacement in accordance with Component Maintenance Manual (CMM) 79-21-12, Revision 2 (or above) to minimise the potential for operational disruption. C. Description This Non-Modification Service Bulletin (NMSB) instructs a periodic replacement of the FOHE. The accomplishment instructions contained in this NMSB instruct the removal and the return of FOHE units to the vendor to have their baffle seals replaced in accordance with CMM 79-21-12, Revision 2 (or above) before 5000 engine flying hours since last unit overhaul or since new (for units not previously overhauled). Accomplishment of this NMSB must be recorded in the engine/module log book. Inform your assigned Rolls-Royce Service Representative of NMSB accomplishment within 10 working days of NMSB completion using Appendix 2. D. Compliance ALERT FUEL OIL HEAT EXCHANGER (FOHE) INSPECTION - NON-MODIFICATION SERVICE BULLETIN - MOD.79-AH031**Printed in Great Britain**



# RB.211−79−AH031 Page 1 of 6 Oct.25/12 Oct.25/12The actions described in section 3. Accomplishment Instructions of this Non-Modification Service Bulletin (NMSB) are to be completed as follows: (1) On-wing (refer to Appendix 1 for vendor details) (a) Carry out FOHE removal in accordance with 3.A. Accomplishment Instructions prior to the following: (i) FOHE Time Since New (TSN) reaches 5000 hours (ii) FOHE Time Since Overhaul (TSO) reaches 5000 hours (b) Any FOHE in service above 4500 hours TSN or 4500 hours TSO at the date of issue of this NMSB, must be removed within 500 hours. (c) Do not install an FOHE unless it has completed less than 5000 hours TSN or 5000 hours TSO (in accordance with CMM 79-21-12 Revision 2 (or above)). (2) In-shop (refer to Appendix 1 for vendor details) (a) Carry out FOHE removal in accordance with 3.B. Accomplishment Instructions prior to the following: (i) FOHE Time Since New (TSN) reaches 5000 hours (ii) FOHE Time Since Overhaul (TSO) reaches 5000 hours (b) Do not install an FOHE unless it has completed less than 5000 hours TSN or 5000 hours TSO (in accordance with CMM 79-21-12 Revision 2 (or above)). This NMSB is anticipated to be the subject of EASA Airworthiness Directive. E. Approval The technical content of this Non-Modification Service Bulletin was approved under the authority of Design Organisation Approval EASA.21J.035 on Oct.24/12. F. Manpower (1) Off-wing Time to replace FOHE 4 man-hours**Printed in Great Britain**



# RB.211−79−AH031 Page 2 Oct.25/12 Oct.25/12(2) On-Wing (a) Time to gain access 1 man-hour (b) Time to replace FOHE 4 man-hours (c) Time to restore to serviceable condition 1 man-hour (d) Time for Ground Run 4 man-hours G. References (1) Airbus A380 Aircraft Maintenance Manual: (a) 71-13-00, Maintenance practices - Open/Close the fan cowl doors. (b) 79-22-41, Removal/Installation - Remove/Install the Fuel/Oil Heat Exchanger. (2) Rolls-Royce Trent 900 Engine Manual: (a) Task 72-00-34-050-801 Remove the Accessories and Components on the LP Compressor Case. (b) Task 72-00-34-450-801 Install the Accessories and Components on the LP Compressor Case. (3) Component Maintenance Manual 79-21-12**Printed in Great Britain**



# RB.211−79−AH031 Page 3 Oct.25/12 Oct.25/122. Material Information A. Parts that will be required to accomplish this NMSB:

EIPC No. QTY PART TITLE PART No. 79-21-11, 01-030 1 Fuel/Oil Heat Exchanger (FOHE) 47111-1241
B. Expendable parts:

EIPC No. QTY PART TITLE PART No. 73-11-13, 01-080 1 Fuel filter element CA02726A 73-11-47, 04-116 1 Ring AS43013-134 73-11-47, 05-108 1 Ring AS43013-134 73-34-11, 01-046 1 Ring, sealing, toroidal 12.37mm I/D x 2.62mm AS43013-112
73-34-11, 01-048 1 Ring, sealing, toroidal 13.94mm I/D x 2.62mm AS43013-113
79-21-11, 02-058 1 Ring, sealing, cap, filter 26121-8649
79-21-11, 02-068 1 Ring, sealing, drain plug, fuel 26121-8637
79-21-11, 02-110 1 Ring, sealing, drain plug, oil 26121-7708
79-33-11, 01-026 2 Ring, sealing, toroidal 9.19mm I/D x 2.62mm AS43013-110
79-34-15, 01-216 2 Ring, sealing, toroidal 9.19mm I/D x 2.62mm AS43013-110**Printed in Great Britain**



# RB.211−79−AH031 Page 4 Oct.25/12 Oct.25/123. Accomplishment instructions A. On-Wing only

WARNING : YOU MUST BE CAREFUL WHEN YOU WORK ON THE ENGINE AFTER THE ENGINE IS SHUTDOWN. THE ENGINE CAN STAY HOT FOR ALMOST ONE HOUR. WARNING : YOU MUST NOT TOUCH HOT PARTS WITHOUT APPLICABLE GLOVES. HOT PARTS CAN CAUSE INJURY. IF YOU GET AN INJURY, PUT IT IN COLD WATER FOR 10 MINUTES. THEN GET MEDICAL AID. WARNING : YOU MUST MAKE THE THRUST REVERSER UNSERVICEABLE (INSTALL AND SAFETY THE INHIBITION DEVICE) BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF YOU DO NOT INSTALL AND SAFETY THE INHIBITION DEVICE, THERE IS A RISK THAT THE THRUST REVERSER CAN OPERATE ACCIDENTALLY. THIS CAN CAUSE INJURY TO PERSON AND/OR DAMAGE TO THE EQUIPMENT. 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) Open the fan cowl doors in accordance with Aircraft Maintenance Manual (AMM) 71-13-00, Maintenance Practices. (2) Remove the FOHE unit in accordance with AMM 79-22-41, Removal/Installation. (3) Install a replacement FOHE unit, in accordance with AMM 79-22-41, Removal/Installation, which has completed less than 5000 hours TSN or 5000 hours TSO (in accordance with CMM 79-21-12 Revision 2 (or above)). (4) Close up: (a) Make sure that the work area is clean and clear of tools and other items. (b) Close the fan cowl doors in accordance with AMM 71-13-00, Maintenance Practices. B. In-shop only

NOTE : This procedure assumes that the FOHE is accessible and that the fuel system has been drained.**Printed in Great Britain**



# RB.211−79−AH031 Page 5 Oct.25/12 Oct.25/12(1) Remove the FOHE in accordance with Rolls-Royce Trent 900 Engine Manual Task 72-00-34-050-801. (2) Install a replacement FOHE in accordance with Rolls-Royce Trent 900 Engine Manual Task 72-00-34-450-801. The replacement FOHE must have completed less than 5000 hours TSN or 5000 hours TSO (in accordance with CMM 79-21-12 Revision 2 (or above)). C. Record accomplishment instructions of NMSB 79-AH031 in accordance with local SB tracking system procedures.
D. Return the removed FOHE to MEGGITT Control Systems for inspection/overhaul (address given in Appendix 1).**Printed in Great Britain**



# RB.211−79−AH031 Page 6 Oct.25/12 Oct.25/12Return Address for Trent 900 FOHE units which require inspection/rework:

MEGGITT Control Systems (Birmingham) OSCAR HOUSE WHARFDALE ROAD TYSELEY BIRMINGHAM B11 2DG UNITED KINGDOM APPENDIX 1**Printed in Great Britain**



# RB.211−79−AH031 Appendix 1 - Page 1 of 1 Oct.25/12 Oct.25/12NMSB 79-AH031 Return Form Regarding Un-Removed/Un-Returned FOHE Units Complete this form and return to your Rolls-Royce Service Representative. Rolls-Royce Service Representatives are required to upload this form onto MAXIMO-SDM. The form is to be used to update records regarding FOHE unit history where possible. 1. Operator: 2. Engine S/N (If Applicable): 3. FOHE S/N: 4. FOHE Unit Details Please complete as far as possible. Hours Since New Cycles Since New Hours Since Overhaul (TSO) Cycles Since Overhaul (CSO)

Name: Signature: Date: APPENDIX 2**Printed in Great Britain**



# RB.211−79−AH031 Appendix 2 - Page 1 of 1 Oct.25/12 Oct.25/12