P.O. Box 31, DERBY DE24 8BJ, UK Telephone: 44 (0) 1332 242424 Fax: 44 (0) 1332 249936 

# Rol Is-Royce
m 

# TRANSMITTA The technical information contained in this document has been approved under the authority of - See Planning Information, Approval.
Signed Date Feb. 21 

### /I 1
N. J. Wright

RB211-TRENT 800 SERIES PROPULSION SYSTEMS NON-MODIFICATION SERVICE BULLETIN 

# ALERT

This document transmits Revision 6 to Service Bulletin RB211-73-AD685 Document History Service Bulletin Revision Status Initial Issue May 16/02 Revision 1 Ju1.25/03 Revision 2 May 7/09 Revision 3 Aug. 18/09 Revision 

### 4 Jan.20/10 Revision 5 Aug.l8/10 Bulletin Revision 6 Remove All pages of the Service Bulletin Supplement Revision Status

Incorporate Pages 1 to 32 of the Service Bulletin



# ALERT Reason for change To qualify the requirement for a fuel and oil leak test in the On-Wing Accomplishment Instructions as being necessary only when any fuel tube has been disturbed.

Transmittal 

### - Page 1 of 2

CHECK THAT ALL PREVIOUS TRANSMllTALS HAVE BEEN INCORPORATED If any have not been received please advise Customer Data Services, Rolls-Royce plc, Derby, England O Rolls-Royce plc (date as above) Printed in Great BritainLIST OF EFFECTIVE PAGES The effective pages to this Service Bulletin following incorporation of Revision 6 are as follows: Page Revision Number Revision Date

Bulletin R 1 6 Feb.21/11 R 2 6 Feb.21/11 R 3 6 Feb.21/11 R 4 6 Feb.21/11 R 5 6 Feb.21/11 R 6 6 Feb.21/11 R 7 6 Feb.21/11 R 8 6 Feb.21/11 R 9 6 Feb.21/11 R 10 6 Feb.21/11 R 11 6 Feb.21/11 R 12 6 Feb.21/11 R 13 6 Feb.21/11 R 14 6 Feb.21/11 R 15 6 Feb.21/11 R 16 6 Feb.21/11 R 17 6 Feb.21/11 R 18 6 Feb.21/11 R 19 6 Feb.21/11 R 20 6 Feb.21/11 R 21 6 Feb.21/11 R 22 6 Feb.21/11 R 23 6 Feb.21/11 R 24 6 Feb.21/11 R 25 6 Feb.21/11 R 26 6 Feb.21/11 R 27 6 Feb.21/11 R 28 6 Feb.21/11 R 29 6 Feb.21/11 R 30 6 Feb.21/11 R 31 6 Feb.21/11 R 32 6 Feb.21/11Printed in Great Britain



# RB.211−73−AD685 Transmittal - Page 21. Planning Information A. Effectivity Boeing 777 RB211-TRENT 875-17 Engines. RB211-TRENT 877-17 Engines. RB211-TRENT 884-17 Engines. RB211-TRENT 884B-17 Engines. RB211-TRENT 892-17 Engines. RB211-TRENT 892B-17 Engines. RB211-TRENT 895-17 Engines.
B. Reason Fuel leaks from the engine have occurred in service due to damage to sections of the fan case LP fuel tubes which run between the Low Pressure and the High Pressure fuel pumps. This damage has been caused by frettage between the securing clips and the the tube outer surface, which has caused localised thinning of the tube wall thickness. The thinning of the tube wall causes the tube to fracture and fuel loss to occur. There have been several reported in-service events of the clips fretting through the tube wall and causing a fuel leak, some of these events have led to a pilot initiated IFSD event. Revision 1 of this NMSB was issued to add TRENT 884B-17 engine mark to the Effectivity. Revision 2 of this NMSB was issued to introduce illustrations of typical early clip wear that would trigger removal of the clip to inspect the clip and the condition of the fuel tube at the interface. Revision 3 of this NMSB was issued to increase the scope of the inspection to include additional LP fuel tubes and their associated hardware, to revise the inspection method and to include an in-shop inspection. LP FUEL TUBE CLIP FRETTAGE INSPECTION - NON-MODIFICATION SERVICE BULLETIN - NON - MOD.73-AD685Printed in Great Britain



# RB.211−73−AD685 Page 1 of 32 May.16/02 Feb.21/11 RRevision 4 of this NMSB was issued to remove the requirement for inspection of the LP fuel tubes and FOHE mount inspections whenever the LP fuel tube interface is disconnected, previously identified by 1.D. Compliance (1) (c). After Revision 3 of this NMSB was issued, the Aircraft Maintenance Manual (AMM) was revised to instruct inspection of the FOHE mounting hardware whenever the FOHE is replaced. Having revised the AMM to include this requirement, Rolls-Royce considered that the repeat 3000 hour inspection requirement as identified in 1.D. Compliance (1) (a) and (b) offered sufficient mitigation to prevent further events. 1.B. Reason was amended to further define the subject LP fuel tubes and Revision 4 also included references in the Accomplishment Instructions to the FOHE mounting hardware part numbers included in Material Information. The Appendix was also revised to include an improved format for Table 1 and Table 2. Revision 5 of this NMSB was R issued to raise 1.D. Compliance from 'Recommended' to 'Alert' and to accomodate an anticipated EASA Airworthiness Directive. The on-wing reaction time to comply with the NMSB requirements has been changed to 2,000 hours and the requirement to record significant findings has been removed, along with the on-wing and in-shop data collection tables. In addition, the Accomplishment Instructions are amended to delete the inspection of the tube clips, which are replaced regardless of condition, the inspection of the FOHE mounting system has been enhanced and an incorrect reference to Part No. FK19213 has been rectified Revision 6 of this NMSB is issued to amend 3.A. (9) On-Wing Accomplishment Instructions for the requirement to do a fuel and oil leak test in accordance with Aircraft Maintenance Manual, Task 71-00-00-800-829-R00. To remove the ambiguity and avoid operational disruption, a fuel and oil leak check ground run should be carried out only if any fuel tube has been disturbed. R R R R R C. Description This NMSB instructs the on-wing and in-shop inspection of Trent 800 LP fuel tubes in order to maintain serviceability. Advise your Rolls-Royce representative of NMSB accomplishment and inspection results, regardless of findings. D. Compliance
ALERT This Non-Modification Service Bulletin is anticipated to be the subject of an EASA Airworthiness DirectivePrinted in Great Britain



# RB.211−73−AD685 Page 2 May.16/02 Feb.21/11 R(1) On wing Complete the action detailed in 3. Accomplishment Instructions, A. On-wing, at the following intervals: (a) If the engine has not been inspected to NMSB 73-D685 Revision 3 or later approved revision, then inspect before the accumulation of 3,000 hours since new, or within 2,000 hours from the effective date of this NMSB revision, whichever is the greater. (b) Following initial inspection in accordance with NMSB 73-D685 Revision 3 or later approved revision, repeat the inspection at intervals not exceeding 3,000 hours.

(2) In-shop Complete the action detailed in 3. Accomplishment Instructions, B. In-shop, at all scheduled shop visits. E. Approval The contents of this Non-Modification Service Bulletin were approved by a representative of the United Kingdom Civil Aviation Authority (CAA) on March 27/02 and were re-approved on June 13/03. Subsequent revisions to Non-Modification Service Bulletin 73-D685 were approved under the authority of the European Aviation Safety Agency (EASA) Design Organisation Approval No. EASA.21J.035 on Aug.18/09, Jan.19/10, Aug.11/10 R and Feb.21/11. R F. Manpower (1) In service (a) To gain access 0.5 hours. (b) To Inspect 2 hours. (c) To return engine to serviceable status 0.5 hours. (2) At overhaul To inspectPrinted in Great Britain



# RB.211−73−AD685 Page 3 May.16/02 Feb.21/11 R2 hours.
NOTE : The parts affected by this Service Bulletin are accessible at overhaul and on-wing. G. Tooling Price and Availability Special tools are not required. H. Weight and Balance Not affected. I. References (1) Component Maintenance Manual, Misc Mech, 79-21-11, Disassembly and Assembly (2) Aircraft Maintenance Manual, 79-21-11, Removal/Installation 2. Material Information A. Parts affected by this Non-Modification Service Bulletin All Engines 73-11-47
FIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP
05100 FK22617 AR Tube, assy fuel - LP fuel filter to line disconnect - FK22617 -
05070 FK21474 AR Bracket, flat, clipping - FK21474 - 05106 BLT5529 AR Bolt, 0.250 in. dia x 1.028 in. - BLT5529 -
05306 AS48515 AR Bolt, 0.250 in. dia x 0.938 in. - AS48515 -
05110 AS20625 AR Nut, 0.250 in dia. - AS20625 - 05108 AS43013 -134 AR Ring, sealing, toroidal - AS43013 -134 -

05308 AS43013 -127 AR Ring, sealing, toroidal - AS43013 -127 -Printed in Great Britain



# RB.211−73−AD685 Page 4 May.16/02 Feb.21/11 RFIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP
05152 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10379 - AS62424 -
05160 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10380 - AS62424 -
05168 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10381 - AS62424 -
05300 FK19213 AR Tube, assy fuel - disconnect to line disconnect - FK19213 -

05328 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10043 - AS20624 -
05336 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10044 - AS62424 -
05344 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10045 - AS62424 -
05500 FK23986 AR Tube, assy fuel - line disconnect to fuel pump - AS62404 -
05270 FK24420 AR Bracket, angle, clipping - FK24420 - 05450 FK22219 AR Bracket, double angle, clipping - FK22219 -
05460 FK25377 AR Bracket, assy - FK25377 - 05506 AS48515 AR Bolt, 0.250 in. dia x 0.938 in. - AS48515 -
05310 AS20625 AR Nut, 0.250 in dia. - AS20625 - 05514 AS48517 AR Bolt, 0.250 in. dia x 1.062 in. - AS48517 -

05508 AS43013 -127 AR Ring, sealing, toroidal - AS43013 -127 -

05516 AS43013 -134 AR Ring, sealing, toroidal - AS43013 -134 -Printed in Great Britain



# RB.211−73−AD685 Page 5 May.16/02 Feb.21/11 RFIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP
05528 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10920 SB73-D510 - AS62424 -

05536 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10921 SB73-D620 - AS62424 -

04500 FK22618 AR Tube, assy fuel - disconnect to FOHE pre SB73-C361 - FK22618 -

04500 FK29101 AR Tube, assy fuel - disconnect to FOHE SB73-C361 - FK29101 -

04470 FK21474 AR Bracket, flat, clipping - FK21474 - 04514 BLT5529 AR Bolt, 0.250 in. dia x 1.028 in. - BLT5529 -
04506 AS48515 AR Bolt, 0.250 in. dia x 0.938 in. - AS48515 -
04310 AS20625 AR Nut, 0.250 in dia. - AS20625 - 04508 AS43013 -127 AR Ring, sealing, toroidal - AS43013 -127 -

04516 AS43013 -134 AR Ring, sealing, toroidal - AS43013 -134 -
04528 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10830 - AS62424 -
04536 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10831 - AS62424 -
04560 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10378 - AS62424 -
04592 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10829 - AS62424 -
04300 FK19212 AR Tube, assy fuel - disconnect to line disconnect - FK19212 -Printed in Great Britain



# RB.211−73−AD685 Page 6 May.16/02 Feb.21/11 RFIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP

04328 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10037 - AS62424 -
04344 AS62424 AR Clip, 38, 10 mm (1.500 in.) CP10044 - AS62424 -
04100 FK19214 AR Tube, assy fuel - LP pump to line disconnect - FK19214 -
04070 FK24422 AR Bracket, angle, clipping - FK24422 - 04090 FK24366 AR Bracket, angle, clipping - FK24366 - 04106 BLT5529 AR Bolt, 0.250 in. dia x 1.028 in. - BLT5529 -
04306 AS48516 AR Bolt, 0.250 in. dia x 1.000 in. - AS48516 -
04110 AS20625 AR Nut, 0.250 in. - AS20625 - 04308 AS43013 -127 AR Ring, sealing, toroidal - AS43013 -127 -

04108 AS43013 -134 AR Ring, sealing, toroidal - AS43013 -134 -

79-21-11
FIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP
01015 FK24907 AR Bracket, angle, bonding lead - FK24907 -
01280 FK20828 AR Bracket, assy FOHE support strut - FK20828 -
01300 FK24686 AR Strut, assy FOHE support - front - FK24686 -
01350 FK20830 AR Bracket, assy FOHE mounting - upper - FK20830 -
01400 FK20831 AR Plate, assy FOHE support - FK20831 -Printed in Great Britain



# RB.211−73−AD685 Page 7 May.16/02 Feb.21/11 RFIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP

01500 FK24687 AR Plate, assy FOHE support - lower - FK24687 -
01560 FK19228 AR Link, assy - upper - FK19228 - 01580 FK19229 AR Link, assy - lower - FK19229 - 01620 FK19003 AR Bracket, assy FOHE mounting - lower - FK19003 -

72-34-15
FIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP
02330 FK24359 AR Bracket, assy FOHE mounting - front - FK24359 -
02340 FK24364 AR Bracket, assy FOHE brace, mounting - FK24364 -Printed in Great Britain



# RB.211−73−AD685 Page 8 May.16/02 Feb.21/11 R3. Accomplishment Instructions A. On-wing - Inspect the tubes (Part No. FK22617, FK19213 and FK23986) and the relevant clipstacks for frettage.

CAUTION : IN ORDER TO REDUCE THE POTENTIAL FOR MULTIPLE-ENGINE IN-FLIGHT SHUTDOWN, POWER LOSS OR OTHER ANOMALY 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 THAT ONE ENGINE AT THE SAME TIME, ROLLS-ROYCE RECOMMENDS THAT ADDITIONAL CONTROLS ARE APPLIED IN ORDER TO MAKE SURE THAT MAINTENANCE TASKS HAVE BEEN COMPLETED AS DEFINED. MAINTENANCE GUIDELINES SHOULD BE REVISED, WHERE POSSIBLE, TO PROMOTE THIS RECOMMENDATION.
NOTE : Clips should be removed and replaced one at a time to prevent pre-loading of the clip position. (1) Refer to Fig.3, Fig.4, Fig.11, Fig.12, Fig.13, Fig.14, Fig.15, Fig.16, Fig.17 and Fig.18. (2) Remove the relevant clip retaining the tube from the clipstack. (3) Inspect all the exposed surface of the fuel tube around the area the clip was fitted, for signs of damage. Use a mirror in areas where direct line of sight access is difficult. Contact frettage to a depth greater than 0,1 mm (0.004 in.) on the outer surface of a bend on the tube Reject and quarantine

Contact frettage 0,2 mm (0.008 in.) in any other area on the tube Reject and quarantine
Cracking Reject and quarantine (4) Inspect the FOHE mounting hardware for signs of damage as follows:
NOTE : Each FOHE mount can be removed, inspected and replaced one at a time without removing the FOHE assembly completely. (a) Remove the FOHE mounting hardware in accordance with Aircraft Maintenance Manual, 79-21-11, Removal. (b) Examine all spherical joint and associated bracket components of the FOHE mounting hardware, the part numbers of which are given in 2. Material Information of this NMSB, for damage/wear.Printed in Great Britain



# RB.211−73−AD685 Page 9 May.16/02 Feb.21/11 RTight but not siezed or corroded Accept Easy to articulate but no play in bearings Accept
Play in spherical bearings Reject Spherical bearings siezed Reject (c) Install the components in accordance with Aircraft Maintenance Manual, 79-21-11, Installation, if no damage/wear is found. (5) If the tube is rejected, remove and install each tube with equivalent new tube in accordance with the following: (a) Remove the rejected fuel tube (Part No. FK23986) in isolation. Refer to Fig.3, Fig.11 and Fig.12. (i) Remove and retain the clipstacks CP10920 (SB73-D510) or CP10921 (SB73-D620). (ii) Remove the nuts (Part No. AS20625) 4 off and the bolts (Part No. AS48515) 4 off that attach the fuel tube (Part No. FK23986) and bracket (Part No. FK24420) to the fuel tube (Part No. FK19213). Remove the bracket (Part No. FK24420). (iii) Remove the bolts (Part No. AS48517) 3 off that attach the fuel tube (Part No. FK23986) and the brackets (Part No. FK25377 and FK22219) to the fuel pump. Remove the fuel tube (Part No. FK23986) and brackets (Part No. FK25377 and FK22219). (iv) Remove the two seal rings (Part No. AS43013-134 and AS43013-127) from the fuel tube (Part No. FK23986). (b) Install the replacement fuel tube (Part No. FK23986) in isolation. Refer to Fig.3, Fig.11 and Fig.12. (i) Lubricate and install the seal ring (Part No. AS43013-134) on the fuel tube (Part No. FK23986) at the fuel pump end of the tube. (ii) Lubricate and install the seal ring (Part No. AS43013-127) on the fuel tube (Part No. FK23986) at the fuel tube (Part No. FK19213) end of the tube. (iii) Fit the fuel tube (Part No. FK23986) and brackets (Part No. FK25377 and FK22219) to the fuel pump with bolts (Part No. AS48517) 3 off . (iv) Torque tighten the bolts (Part No. AS48517) 3 off to 11,5 Nm (100 lbfin.).Printed in Great Britain



# RB.211−73−AD685 Page 10 May.16/02 Feb.21/11 R(v) Fit the fuel tube (Part No. FK23986) and bracket (Part No. FK24420) to the fuel tube (Part No.FK19213) with bolts (Part No. AS48515) 4 off and nuts (Part No. AS20625) 4 off. (vi) Torque tighten the nuts (Part No. AS20625) 4 off to 15,2 Nm (135 lbfin.). (vii) SB73-D510 - Install the clipstack CP10920 with new clips and torque tighten the nut (Part No. AS20624) to 6,2 Nm (55 lbfin). (viii) SB73-D260 - Install the clipstack CP10921 with new clips and torque tighten the nut (Part No. AS20624) to 6,2 Nm (55 lbfin). (c) Remove the rejected fuel tube (Part No. FK19213) in isolation. Refer to Fig.3, Fig.4, Fig.13, Fig.14 and Fig.15. (i) Remove and retain the clipstacks CP10045, CP10044 and CP10043. (ii) Remove the nuts (Part No. AS20625) 4 off and the bolts (Part No. AS48515) 4 off that attach the fuel tube (Part No. FK19213) to the fuel tube (Part No. FK22617). (iii) Remove the nuts (Part No. AS20625) 4 off and the bolts (Part No. AS48515) 4 off that attach the fuel tube (Part No. FK19213) and bracket (Part No. FK24420) to the fuel tube (Part No. FK23986). Remove the fuel tube (Part No. FK19213). (iv) Remove the seal rings (Part No. AS43013-127) 2 off from the fuel tube (Part No. FK19213). (d) Install the replacement fuel tube (Part No. FK19213) in isolation. Refer to Fig.3, Fig.4, Fig.13, Fig.14 and Fig.15. (i) Lubricate and install the seal rings (Part No. AS43013-127) 2 off on each end of the fuel tube (Part No. FK19213). (ii) Fit the fuel tube (Part No. FK19213) to the fuel tube (Part No. FK22617) with nuts (Part No. AS20625) and with bolts (Part No. AS48515) 4 off . (iii) Torque tighten the nuts (Part No. AS20625) 4 off to 15,2 Nm (135 lbfin.). (iv) Fit the fuel tube (Part No. FK19213) and bracket (Part No. FK24420) to the fuel tube (Part No.FK23986) with bolts (Part No. AS48515) 4 off and nuts (Part No. AS20625) 4 off. (v) Torque tighten the nuts (Part No. AS20625) 4 off to 15,2 Nm (135 lbfin.).Printed in Great Britain



# RB.211−73−AD685 Page 11 May.16/02 Feb.21/11 R(vi) Install the clipstacks CP10043, CP10044 and CP10045 with new clips and torque tighten the nut (Part No. AS20624) (CP10043 and CP10044). Torque tighten the bolt (Part No. AS48409) (CP10045) for the clipstacks to 6,2 Nm (55 lbfin). (e) Remove the rejected fuel tube (Part No. FK22617) in isolation. Refer to Fig.4, Fig.16, Fig.17 and Fig.18. (i) Remove and retain the clipstacks CP10381, CP10380 and CP10379. (ii) Remove the bolts (Part No. BLT5529) 3 off that attach the fuel tube (Part No. FK22617) and the bracket (Part No. FK21474) to the FOHE. (iii) Remove the nuts (Part No. AS20625) 4 off and the bolts (Part No. AS48515) 4 off that attach the fuel tube (Part No. FK22617) to the fuel tube (Part No. FK19213). Remove the fuel tube (Part No. FK22617). (iv) Remove the seal rings (Part No. AS43013-134 and AS43013-127) from the fuel tube (Part No. FK22617). (f) Install the replacement fuel tube (Part No. FK22617) in isolation. Refer to Fig.4, Fig.16, Fig.17 and Fig.18. (i) Lubricate and install the seal ring (Part No. AS43013-134) on the fuel tube (Part No. FK22617) at the FOHE end of the tube. (ii) Lubricate and install the seal ring (Part No. AS43013-127) on the fuel tube (Part No. FK22617) at the fuel tube (Part No. FK19213) end of the tube. (iii) Fit the fuel tube (Part No. FK22617) and bracket (Part No. FK21474) to the FOHE with bolts (Part No. BLT5529) 3 off . (iv) Torque tighten the bolts (Part No. BLT5529) 3 off to 11,5 Nm (100 lbfin.). (v) Fit the fuel tube (Part No. FK22617) to the fuel tube (Part No.FK91213) with bolts (Part No. AS48515) 4 off and nuts (Part No. AS20625) 4 off. (vi) Torque tighten the nuts (Part No. AS20625) 4 off to 15,2 Nm (135 lbfin.). (vii) Install the clipstacks CP10379, CP10380 and CP10381 with new clips and torque tighten the bolts (Part No. AS48409) 3 off for the clipstacks to 6,2 Nm (55 lbfin).Printed in Great Britain



# RB.211−73−AD685 Page 12 May.16/02 Feb.21/11 R(6) If the tube has not been replaced, fit a new clip to the fuel tube at the relevant clipping point(s).
NOTE : This should be carried out irrespective of whether the tube has been replaced or not. (7) For clip positions CP10044, CP10043, CP10920 and CP10921, torque the nut to 6,2 Nm (55 lbfin.). (8) For clip positions CP10379, CP10380, CP10381 and CP10045, torque the bolt to 6,2 Nm (55 lbfin.). (9) If any fuel tube has been disturbed, carry R out fuel and oil leak test in accordance with Aircraft Maintenance Manual, TASK 71-00-00-800-829-R00. B. In-shop - Inspect the tubes (EIPC Ref. 73-11-47, Fig/Item No. 05-100, 05-300, 05-500, 04-100, 04-300 and 04-500) and the relevant clipstacks for frettage.

NOTE : If it is not planned to remove the tubes as part of the existing shop visit workscope, the clips should be removed and replaced one at a time to prevent pre-loading of the clip position. (1) Refer to Fig.1, Fig.2, Fig.3, Fig.4, Fig.5, Fig.6, Fig.7, Fig.8, Fig.9, Fig.10, Fig.11, Fig.12, Fig.13, Fig.14, Fig.15, Fig.16, Fig.17 and Fig.18. (2) Remove the relevant clip retaining the tube from the clipstack. (3) Inspect all the exposed surface of the fuel tube around the area the clip was fitted, for signs of damage. Use a mirror in areas where direct line of sight access is difficult. Contact frettage to a depth greater than 0,1 mm (0.004 in.) on the outer surface of a bend on the tube Reject and quarantine

Contact frettage 0,2 mm (0.008 in.) in any other area on the tube Reject and quarantine
Cracking Reject and quarantine (4) Inspect the FOHE mounting hardware for signs of damage as follows:
NOTE : Each FOHE mount can be removed, inspected and replaced one at a time without removing the FOHE assembly completely. (a) Remove the FOHE mounting hardware in accordance with Component Maintenance Manual, Misc Mech, 79-21-11, Disassembly.Printed in Great Britain



# RB.211−73−AD685 Page 13 May.16/02 Feb.21/11 R(b) Examine all spherical joint and associated bracket components of the FOHE mounting hardware, the part numbers of which are given in 2. Material Information of this NMSB, for damage/wear. Tight but not siezed or corroded Accept Easy to articulate but no play in bearings Accept
Play in spherical bearings Reject Spherical bearings seized Reject (c) Install the components in accordance with Component Maintenance Manual, Misc Mech, 79-21-11, Assembly, if no damage/wear is found.
NOTE : If this inspection is being carried out during the replacement of an FOHE, the FOHE's mounts will be exposed therefore it is recommended that the inspection of the FOHE mounts be carried out regardless of the LP fuel tube condition. (5) If the tube is rejected, remove and install each tube with equivalent new tube and clips in accordance with Engine Manual, 72-00-34, Removal and Installation: (6) If the tube has not been replaced, fit a new clip to the fuel tube at the relevant clipping point(s).
NOTE : This should be carried out irrespective of whether the tube has been replaced or not. (7) For clip positions CP10382, CP10044, CP10043, CP10920 and CP10921, torque the nut to 6,2 Nm (55 lbfin.). (8) For clip positions CP10378, CP10829, CP10830, CP10831, CP10037, CP10379, CP10380, CP10381 and CP10045, torque the bolt to 6,2 Nm (55 lbfin.). C. Accomplishment of this Non-Modification Service Bulletin should be recorded in the engine logbook or in accordance with the local SB tracking system procedures. State whether accomplishment of this NMSB is on-wing or in-shop.Printed in Great Britain



# RB.211−73−AD685 Page 14 May.16/02 Feb.21/11 RRemoval and Installation of Tubes In-Shop Fig.1Printed in Great Britain



# RB.211−73−AD685 Page 15 May.16/02 Feb.21/11 RRemoval and Installation of Tubes In-Shop Fig.2Printed in Great Britain



# RB.211−73−AD685 Page 16 May.16/02 Feb.21/11 RRemoval and Installation of Tubes On-Wing and In-Shop Fig.3Printed in Great Britain



# RB.211−73−AD685 Page 17 May.16/02 Feb.21/11 RRemoval and Installation of Tubes On-Wing and In-Shop Fig.4Printed in Great Britain



# RB.211−73−AD685 Page 18 May.16/02 Feb.21/11 RClipstack CP10037 Removal and Installation Fig.5Printed in Great Britain



# RB.211−73−AD685 Page 19 May.16/02 Feb.21/11 RClipstack CP10382 Removal and Installation Fig.6Printed in Great Britain



# RB.211−73−AD685 Page 20 May.16/02 Feb.21/11 RClipstack CP10378 Removal and Installation Fig.7Printed in Great Britain



# RB.211−73−AD685 Page 21 May.16/02 Feb.21/11 RClipstack CP10829 Removal and Installation Fig.8Printed in Great Britain



# RB.211−73−AD685 Page 22 May.16/02 Feb.21/11 RClipstack CP10830 Removal and Installation Fig.9Printed in Great Britain



# RB.211−73−AD685 Page 23 May.16/02 Feb.21/11 RClipstack CP10831 Removal and Installation Fig.10Printed in Great Britain



# RB.211−73−AD685 Page 24 May.16/02 Feb.21/11 RClipstack CP10920 Removal and Installation Fig.11Printed in Great Britain



# RB.211−73−AD685 Page 25 May.16/02 Feb.21/11 RClipstack CP10921 Removal and Installation Fig.12Printed in Great Britain



# RB.211−73−AD685 Page 26 May.16/02 Feb.21/11 RClipstack CP10045 Removal and Installation Fig.13Printed in Great Britain



# RB.211−73−AD685 Page 27 May.16/02 Feb.21/11 RClipstack CP10044 Removal and Installation Fig.14Printed in Great Britain



# RB.211−73−AD685 Page 28 May.16/02 Feb.21/11 RClipstack CP10043 Removal and Installation Fig.15Printed in Great Britain



# RB.211−73−AD685 Page 29 May.16/02 Feb.21/11 RClipstack CP10381 Removal and Installation Fig.16Printed in Great Britain



# RB.211−73−AD685 Page 30 May.16/02 Feb.21/11 RClipstack CP10380 Removal and Installation Fig.17Printed in Great Britain



# RB.211−73−AD685 Page 31 May.16/02 Feb.21/11 RClipstack CP10379 Removal and Installation Fig.18Printed in Great Britain



# RB.211−73−AD685 Page 32 May.16/02 Feb.21/11 R