This document transmits Revision 4 to Service Bulletin RB211-72-G448 Document History Service Bulletin Revision Status Supplement Revision Status Initial Issue Jul.26/10 Revision 1 Oct.29/10 Revision 2 Dec.23/10 Revision 3 Jul.7/11 Bulletin Revision 4 Remove Incorporate Reason for change Pages 1 to 51 of the Service Bulletin Pages 1 to 53 of the Service Bulletin Revised 3.Accomplishment Instructions to clarify acceptance criteria for the balance washer keys (tabs). Added/Revised Figs.7 thru Fig.9. Updated sections 1.B. Reason, 1.D. Compliance, 1.E. Approval and 1.I. References. Minor text changes have also been made.**Printed in Great Britain** Aug.21/14

RB211 TRENT 500 AND TRENT 900 SERIES PROPULSION SYSTEMS NON-MODIFICATION SERVICE BULLETIN



# RB.211−72−G448 Transmittal - Page 1 of 4 DateAll pages of Appendix 1 Page 1 and 2 of Appendix 1 Revised 3.Accomplishment Instructions to clarify acceptance criteria for the balance washer keys (tabs). Added/Revised Figs.7 thru Fig.9. Updated sections 1.B. Reason, 1.D. Compliance, 1.E. Approval and 1.I. References. Minor text changes have also been made. All pages of Appendix 2 Page 1 and 2 of Appendix 2 Revised 3.Accomplishment Instructions to clarify acceptance criteria for the balance washer keys (tabs). Added/Revised Figs.7 thru Fig.9. Updated sections 1.B. Reason, 1.D. Compliance, 1.E. Approval and 1.I. References. Minor text changes have also been made. All pages of Appendix 3 Page 1 and 2 of Appendix 3 Revised 3.Accomplishment Instructions to clarify acceptance criteria for the balance washer keys (tabs). Added/Revised Figs.7 thru Fig.9. Updated sections 1.B. Reason, 1.D. Compliance, 1.E. Approval and 1.I. References. Minor text changes have also been made.**Printed in Great Britain**



# RB.211−72−G448 Transmittal - Page 2LIST OF EFFECTIVE PAGES The effective pages to this Service Bulletin following incorporation of Revision 4 are as follows: Page Revision Number Revision Date

Bulletin R 1 4 Aug.21/14 R 2 4 Aug.21/14 R 3 4 Aug.21/14 R 4 4 Aug.21/14 R 5 4 Aug.21/14 R 6 4 Aug.21/14 R 7 4 Aug.21/14 R 8 4 Aug.21/14 R 9 4 Aug.21/14 R 10 4 Aug.21/14 R 11 4 Aug.21/14 R 12 4 Aug.21/14 R 13 4 Aug.21/14 R 14 4 Aug.21/14 R 15 4 Aug.21/14 R 16 4 Aug.21/14 R 17 4 Aug.21/14 R 18 4 Aug.21/14 R 19 4 Aug.21/14 R 20 4 Aug.21/14 R 21 4 Aug.21/14 R 22 4 Aug.21/14 R 23 4 Aug.21/14 R 24 4 Aug.21/14 R 25 4 Aug.21/14 R 26 4 Aug.21/14 R 27 4 Aug.21/14 R 28 4 Aug.21/14 R 29 4 Aug.21/14 R 30 4 Aug.21/14 R 31 4 Aug.21/14 R 32 4 Aug.21/14 R 33 4 Aug.21/14 R 34 4 Aug.21/14 R 35 4 Aug.21/14 R 36 4 Aug.21/14 R 37 4 Aug.21/14 R 38 4 Aug.21/14 R 39 4 Aug.21/14 R 40 4 Aug.21/14 R 41 4 Aug.21/14 R 42 4 Aug.21/14 R 43 4 Aug.21/14 R 44 4 Aug.21/14**Printed in Great Britain**



# RB.211−72−G448 Transmittal - Page 3R 45 4 Aug.21/14 R 46 4 Aug.21/14 R 47 4 Aug.21/14 R 48 4 Aug.21/14 R 49 4 Aug.21/14 R 50 4 Aug.21/14 R 51 4 Aug.21/14 R 52 4 Aug.21/14 R 53 4 Aug.21/14 Appendix 1 R 1 4 Aug.21/14 R 2 4 Aug.21/14 Appendix 2 R 1 4 Aug.21/14 R 2 4 Aug.21/14 Appendix 3 R 1 4 Aug.21/14 R 2 4 Aug.21/14**Printed in Great Britain**



# RB.211−72−G448 Transmittal - Page 41. Planning Information A. Effectivity (1) Airbus A340 RB211 TRENT553-61 Engines RB211 TRENT553A2-61 Engines RB211 TRENT556-61 Engines RB211 TRENT556A2-61 Engines RB211 TRENT556B-61 Engines RB211 TRENT556B2-61 Engines RB211 TRENT560-61 Engines RB211 TRENT560A2-61 Engines (2) Airbus A380 RB211 TRENT970-84 Engines RB211 TRENT970B-84 Engines RB211 TRENT972-84 Engines RB211 TRENT972B-84 Engines RB211 TRENT977-84 Engines RB211 TRENT977B-84 Engines RB211 TRENT980-84 Engines
B. Reason (1) Problem Cracking of the rear balance land has been found on two Trent 800 IP compressor shafts and on one Trent 700 IP compressor shaft. The balancing feature and method is similar on Trent 500 and Trent 900 engines although the disc geometry is different from Trent 700 and Trent 800 engines. ENGINE - IP COMPRESSOR SHAFT - IN SHOP EDDY CURRENT OR BORESCOPE INSPECTION OF BALANCE LAND - NON-MODIFICATION SERVICE BULLETIN - NON - MOD.72-G448**Printed in Great Britain**



# RB.211−72−G448 Page 1 of 53 Jul.26/10 Aug.21/14 RNon-Modification Service Bulletin (NMSB) 72-AF260 was issued to specify an in-shop visual inspection of the rear balance land and applied to Trent 500, Trent 700 and Trent 800 engines. NMSB72-G269 was later issued to specify an in-shop visual inspection of the rear balance land and applied to Trent 900 engines only. NMSB72-G448 specifies an enhanced crack detection technique, eddy current inspection for the rear balance land when the rear of the IPC module is exposed and a borescope inspection of the balance land when it is not exposed. This inspection is to be done in-shop on Trent 500 and Trent 900 engines. (2) This NMSB supersedes NMSB 72-AF260 (for Trent 500 engines) and NMSB 72-G269 (for R R Trent 900 engines). NMSB 72-AF260 and NMSB 72-G269 will be cancelled. R (3) Substantiation This NMSB instructs in-shop inspection of the IP compressor shaft rear balance land. If the rear of the IP compressor module is exposed this is an eddy current inspection. If it is not exposed this is a borescope inspection gaining access through the intermediate case. Revision 1 of this NMSB was issued to add a procedure for determining if an Eddy Current Inspection crack indication is spurious or genuine. Revision 2 of this NMSB was issued to extend the date from which the NMSB became effective, that followed a delay in the availabilty of the Eddy Current Inspection tooling. Revision 3 of this NMSB was R to change the order of visual and eddy current inspection procedures and to make minor changes to eddy current inspection procedures in section 3.D. Accomplishment Instructions. Revision 4 of this NMSB is issued to revise sections 1.D. Compliance and to clarify acceptance criteria for the balance washer keys (tabs) in 3. Accomplishment Instructions, including a new Figure (Fig.9 sheet 2 of 2). Minor text changes have been made and additional references added to 1.I. References. R R R R R (4) Effect of Bulletin on: (a) Operation Not affected. (b) Maintenance Not affected.**Printed in Great Britain**



# RB.211−72−G448 Page 2 Jul.26/10 Aug.21/14 R(c) Overhaul Not affected. (d) Repair Schemes Not affected. (e) Interchangeability Not affected. C. Description This NMSB instructs an in-shop inspection of the IP compressor shaft rear balance land in order to maintain serviceability and obtain data to support engineering analysis. Send copies of the NMSB inspection results to your Rolls-Royce service representative by completion of Appendix 1 (borescope inspection) or Appendix 2 (eddy current inspection) or send an equivalent form containing the same information.
NOTE : If the rear face of the IPC module is not exposed, visual borescope inspection of the IPC rear balance land, refer to 3.B. or 3.C., is acceptable in lieu of a repeat on-wing inspection required under NMSB 72-AH058 or NMSB 72-AH059 and will reset the cyclic interval count to zero. R R R R R D. Compliance
RECOMMENDED This NMSB must be accomplished on engines at Module M32-IPC Module, rework level of Module Check and Repair, Module Overhaul, Engine Refurbishment or where the engine is disassembled sufficiently to expose the rear face of the IP compressor module. R R R R If the rear face of the IPC module is exposed: Conduct an Eddy current inspection, refer to 3.D. R R This NMSB does not need be accomplished on IP compressor shafts that have a life of zero cycles since new. R R This Non-Modification Service Bulletin is the subject of an European Aviation Safety Agency (EASA) approved Airworthiness Directive (AD) No.: AD2014-0152. R R**Printed in Great Britain**



# RB.211−72−G448 Page 3 Jul.26/10 Aug.21/14 RE. Approval The technical content of this Non-Modification Service Bulletin was approved under the authority of Design Organisation Approval EASA.21J.035 on Jul.21/10, Oct.28/10, Dec.23/10, Jul.5/11 R and was re-approved on Aug.21/14. F. Manpower (1) Borescope Inspection: (a) Time to gain access 30 minutes (1 person). (b) Time to inspect 1 hour 30 minutes (2 persons). (c) Time to restore to serviceable condition 1 hour (1 person). (2) Eddy Current Inspection: (a) Time to remove balance weights 15 minutes (1 person). (b) Time to clean balance land Up to 2 hours, depending on level of debris in balance land recess (1 person). (c) Time to inspect 2 hours (1 person).
NOTE : The ECI technique described in section 3. Accomplishment Instructions must only be carried out by personnel approved to the applicable national standard (EN4179, NAS 410 or equivalent) at level 2 or higher. (d) Time to install balance weights 15 minutes (1 person).
NOTE : Parts affected by this NMSB are accessible at overhaul G. Material Price and Availability Modification kit not required; parts supplied as single line items.**Printed in Great Britain**



# RB.211−72−G448 Page 4 Jul.26/10 Aug.21/14 RH. Tooling Price and Availability The following equipment is required to accomplish this NMSB: Part No. Description Borescope 4 mm or 6 mm flexible borescope with forward viewing and side view tips HU40324 IP Rotor turning tool (Trent 500) HU43985 IP Rotor turning tool (Trent 900) HU82346 Borescope guide tube Rohmann Elotest B1 or equivalent instrument Phase Display Eddy Current Instrument HU44791 Trent 500 IPC stage 8 balance land Eddy Current Inspection Kit comprising of the following parts: HU44793 (Wheeled carriage) MDK1 H-1803.03.1 (Eddy Current Probe) HU44792 (Calibration Block) HU44795 Trent 900 IPC stage 8 balance land Eddy Current Inspection Kit comprising of the following parts: HU44797 (Wheeled carriage) MDK1 H-1803.03.1 (Eddy Current Probe) HU44796 (Calibration Block) Elotest instruments - EK/2HF/1 Connecting leads for other instruments are available from Rohmann Probe to instrument connecting cable

I. References (1) Trent 500 Engine Manual, 72-32-31, Cleaning, Inspection (2) Trent 900 Engine Manual, 72-00-13, Clip Position Data (3) Trent 900 CIR Manual, 72-32-31, Cleaning, Inspection (4) Overhaul Processes Manual TSD594J, 70-00-00, OP101, OP117, OP363 (5) Standard Practices Manual, 70-51-00, Torque Tighten Components, 70-12-04, Procedures used to Lock Threaded Parts (6) Rolls-Royce RB211 Non-Modification Service Bulletins: (a) 72-AF260 Engine - IP compressor shaft - Visual inspection of balance land**Printed in Great Britain**



# RB.211−72−G448 Page 5 Jul.26/10 Aug.21/14 R(b) 72-G269 Engine - IP compressor shaft - Visual inspection of balance land (c) 72-AH058 R Engine - IP Compressor Shaft - Visual Borescope Inspection of Balance Land R R (d) 72-AH059 R Engine - IP Compressor Shaft - Visual Borescope Inspection of Balance Land R R (7) Rolls-Royce RB211 Service Bulletins: R (a) 72-AH555 R Engine - IP compressor Shaft - Introduction of revised Method of Balancing the Rear of the IP Compressor Rotor R R (b) 72-AH561 R Engine - IP Compressor Shaft - Introduction of revised Balancing Method at the Rear of the IP Compressor using New Balance Weights under Blade R R R**Printed in Great Britain**



# RB.211−72−G448 Page 6 Jul.26/10 Aug.21/14 R2. Material Information A. Parts required to accomplish this Non-Modification Service Bulletin: All Engines 72-32-31
FIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP
01450 AS44702 AR Bolt, 0.190 in. dia x 0.335 in. VU1653 - AS44702 -

01452 AS44691 AR Washer, VU1653 - AS44691 - 01445 AS44696 AR Clamp - AS454696 - 01415 AS44695 -150 AR Balance weight - AS44695-150-

01417 AS44695 -175 AR Balance weight - AS44695-175-

01419 AS44695 -200 AR Balance weight - AS44695-200-

01421 AS44695 -225 AR Balance weight - AS44695-225-

01423 AS44695 -250 AR Balance weight - AS44695-250-

01425 AS44695 -275 AR Balance weight - AS44695-275-

01427 AS44695 -300 AR Balance weight - AS44695-300-
Trent 500 Engines 75-22-49
FIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP

21100 FW17133 AR Air Tube - FW17133 -**Printed in Great Britain**



# RB.211−72−G448 Page 7 Jul.26/10 Aug.21/14 RFIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP

21106 AS48510 AR Bolt - AS48510 - 21114 AS48513 AR Bolt - AS48513 - 21112 AS12944 AR Washer - AS12944 - 21113 CU37148 AR Washer - CU37148 - 21125 AS48408 AR Bolt (CP101919) - AS48408 - 21126 K8831 AR Washer (CP101919) - K8831 - 21128 UP11470 AR Clip (CP101919) - UP11470 - 21132 AS20624 AR Nut (CP101919) - AS20624 - Trent 900 Engines 75-22-49
FIG ITEM NO. NEW PART NO. QTY PART TITLE MAT OLD PART NO. INSTR DISP

13100 FW24803 AR Air Tube - FW24803 - 13106 AS48528 AR Bolt - AS48528 - 13107 AS48512 AR Bolt - AS48512 -
NOTE : Quantity As Required (AR) up to a maximum of 4.**Printed in Great Britain**



# RB.211−72−G448 Page 8 Jul.26/10 Aug.21/14 R3. Accomplishment Instructions A. Consumable Materials
OMat 4/46, jointing compound OMat 261, temporary marker OMat 2/142, safety cable OMat 256 or OMat 2/30, PTFE adhesive tape. Note that the same type of tape must be used throughout all stages of calibration and inspection. B. Borescope Inspection of Trent 500 Engines

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 : DO NOT START THE BORESCOPE INSPECTION UNTIL THE ENGINE HAS COOLED TO WITHIN THE BORESCOPE MANUFACTURERS RECOMMENDATIONS. THE ENGINE IS HOT IMMEDIATELY AFTER THE ENGINE IS STOPPED AND CAN CAUSE BURNS AND DAMAGE TO BORESCOPE INSPECTION EQUIPMENT.
NOTE : If parts have already been disassembled or the applicable system is not available, some steps will not be required. (1) Get access to compressor intermediate case, vane 8 by removing the IP8 buffer air tube (EIPC 75-22-49, Fig/Item 21-100). (a) Disconnect air tube (EIPC 75-22-49, Fig/Item 21-500) from the IP8 buffer air tube (EIPC 75-22-49, Fig/Item 21-100) at the compressor intermediate case firewall. Refer to Fig.1. (b) Remove and retain bolts (EIPC 75-22-49, Fig/Item 21-114) and washers (EIPC 75-22-49, Fig/Item 21-112 and 21-113) that connect the IP8 buffer air tube (EIPC 75-22-49, Fig/Item 21-100) to the compressor intermediate case firewall. Refer to Fig.1. (c) Remove and retain clipstack CP101919. Refer to Fig.3. (d) Remove and retain bolts (EIPC 75-22-49, Fig/Item 21-106) 3 off connecting the tube to the compressor intermediate case. Refer to Fig.1. (e) Remove IP8 buffer air tube (EIPC 75-22-49, Fig/Item 21-100).**Printed in Great Britain**



# RB.211−72−G448 Page 9 Jul.26/10 Aug.21/14 R(2) Do the borescope inspection of the IP compressor stage 8 disc balance land from Direction 1. (a) Put the borescope with a forward viewing tip fitted into the intermediate case, vane 8. The vane will guide the borescope towards the rear of the IP compressor stage 8 disc. (b) Slowly move the borescope to view the balance land from Direction 1 as shown in Fig.5.
CAUTION : MAKE SURE THAT THE BORESCOPE IS NOT IN THE PATH OF ANY ROTATING COMPONENT WHEN YOU TURN THE ENGINE. IF THE BORESCOPE AND ROTATING COMPONENT TOUCH, DAMAGE TO EITHER THE ROTATING COMPONENT OR BORESCOPE WILL OCCUR. (c) Use HU40324, turning tool to slowly turn the IP compressor. (d) Do an inspection of the balance land from Direction 1 over all the circumference of the balance land. Refer to Fig.5.
NOTE : Together with inspection from Direction 2 (refer to section 3.B.(3)), you must do an inspection of Zone A of the balance land along the circumference. Refer to Fig.6. (e) Look for cracks, R dents or nicks, loose balance weights and washer key (tab) locations. R R For acceptance criteria refer to step 3.B.(4).
NOTE : Carefully examine the area around the balance weights. Carefully examine all around the edge of the clamp plate to make sure there is no cracking that has started underneath the clamp plate. Fig.7, Fig.8 and Fig.9 are provided as examples. R (f) Record the results in Appendix 1. (g) Remove borescope from the compressor intermediate case, vane 8. (3) Do the borescope inspection of the IP compressor stage 8 disc balance land from Direction 2. (a) Put the borescope with a side viewing tip fitted into HU82346, guide tube, so that the tip of the borescope is just short of the guide tube end. (b) Make sure the curved end of the guide tube is towards the front of the engine and put the guide tube into the intermediate case, vane 8.
NOTE : The guide tube will need to be straightened by hand to go into the vane.**Printed in Great Britain**



# RB.211−72−G448 Page 10 Jul.26/10 Aug.21/14 R(c) Push the guide tube into the engine until the end of the guide tube is in the cavity behind the stage 8 disc. The guide tube will then spring back to its original shape. (d) Push the borescope through the guide tube until the viewing tip emerges from the guide tube. (e) Slowly move the borescope until you can see the balance land from Direction 2 as shown in Fig.5.
CAUTION : MAKE SURE THAT THE BORESCOPE IS NOT IN THE PATH OF ANY ROTATING COMPONENT WHEN YOU TURN THE ENGINE. IF THE BORESCOPE AND ROTATING COMPONENT TOUCH, DAMAGE TO EITHER THE ROTATING COMPONENT OR BORESCOPE WILL OCCUR. (f) Use HU40324, turning tool to Slowly turn the IP compressor. (g) Do an inspection of the balance land from Direction 2 over all the circumference of the balance land.
NOTE : Together with the inspection from Direction 1 (refer to section 3.B.(2)), you must do an inspection of Zone A of the balance land along the circumference. Refer to Fig.6. (h) Look for cracks, R dents or nicks, loose balance weights and washer key (tab) locations. R R For acceptance criteria refer to step 3.B.(4).
NOTE : Carefully examine the area around the balance weights. Carefully examine all around the edge of the clamp plate to make sure there is no cracking that has started R underneath the clamp plate. Fig.7, Fig.8 and Fig.9 are provided as examples. R (i) Record the results in Appendix 1. (j) Remove borescope until the viewing tip is inside the guide tube and then remove the borescope and guide tube from the intermediate case vane 8. (4) Acceptance Criteria (a) Cracked - Reject, inform Rolls-Royce as soon as practically possible. R (b) Dented or nicked: R (i) Reject. Supply pictures of dent or nick to Rolls-Royce Technical Help Desk. R R (c) Loose balance weights (refer to Fig.9): R (i) Reject. Supply pictures of balance weights to Rolls-Royce Technical Help Desk. R R**Printed in Great Britain**



# RB.211−72−G448 Page 11 Jul.26/10 Aug.21/14 R(d) Washer key (tab) locations (refer to Fig.9): R (i) One or more locking keys (tabs) limiting bolt rotation in the anti-clockwise direction - Accept R R (ii) No locking keys (tabs) limiting bolt rotation in the anti-clockwise direction - Reject. Supply pictures of balance weights to Rolls-Royce Technical Help Desk. R R R (5) Install the IP8 buffer air tube (EIPC 75-22-49, Fig/Item 21-100). (a) Clean mating faces of the tube flange and the intermediate case diaphragm. Refer to OP TASK 70-00-00, OP101. (b) Apply a thin layer of OMat 4/46, jointing compound to the mating faces of the flange and the compressor intermediate case diaphragm. Refer to Fig.2. (c) Let OMat 4/46, jointing compound dry for a minimum of 10 minutes. (d) Make sure all of OMat 4/46, jointing compound is removed from the bolt holes. (e) Connect the tube to the compressor intermediate case diaphragm with bolts (EIPC 75-22-49, Fig/Item 21-114) 2 off and washers (EIPC 75-22-49, Fig/Item 21-112 and 21-113). Refer to Fig.1. (f) Torque bolts (EIPC 75-22-49, Fig/Item 21-114) to 11,5 Nm (100 lbfin.). (g) After 10 minutes, torque the bolts (EIPC 75-22-49, Fig/Item 21-114) again to 11,5 Nm (100 lbfin.). (h) Install tube (EIPC 75-22-49, Fig/Item 21-100) to the compressor intermediate case (EIPC 72-33-10, Fig/Item 02-500) with bolts (EIPC 75-22-49, Fig/Item 21-106) 3 off. Refer to Fig.1. (i) Torque bolts to (EIPC 75-22-49, Fig/Item 21-106) to 11,5 Nm (100 lbfin). (j) Connect tube (EIPC 75-22-49, Fig/Item 21-100) to the bracket (EIPC 75-33-16, Fig/Item 01-010) at clip position CP101919. Refer to Fig.3. (k) Torque nut (EIPC 72-22-49, Fig/Item 21-132) to 6,2 Nm (55 lbfin.). (l) Connect tube (EIPC 75-22-49, Fig/Item 21-500) to tube (EIPC 75-22-49, Fig/Item 21-100). Refer to Fig.1. (m) Torque union nut on tube (EIPC 75-22-49, Fig/Item 21-500) to 67 Nm (590 lbfin.).**Printed in Great Britain**



# RB.211−72−G448 Page 12 Jul.26/10 Aug.21/14 R(n) Where applicable, attach safety R union nut on tube (EIPC 75-22-49, Fig/Item 21-500) with OMat 2/142, safety cable. (6) Accomplishment of this Non-Modification Service Bulletin should be recorded in the engine logbook. (7) Record the results of the inspection in Appendix 1. C. Borescope Inspection of Trent 900 Engines.

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 : DO NOT START THE BORESCOPE INSPECTION UNTIL THE ENGINE HAS COOLED TO WITHIN THE BORESCOPE MANUFACTURERS RECOMMENDATIONS. THE ENGINE IS HOT IMMEDIATELY AFTER THE ENGINE IS STOPPED AND CAN CAUSE BURNS AND DAMAGE TO BORESCOPE INSPECTION EQUIPMENT.
NOTE : If parts have already been disassembled or the applicable system is not available, some steps will not be required. (1) Get access to the compressor intermediate case. (a) Disassemble and retain 6 clip positions CP210106, CP210107, CP210101, CP210100, CP210104 and CP210105. Refer to Engine Manual, 72-00-13, Clip Position Data and Fig.4. (b) Disconnect air tube (EIPC 75-22-49, Fig/Item 13-100) from the two IP8 air tubes (EIPC 75-22-49, Fig/Item 13-500 and 13-700). Refer to Fig.4. (c) Remove and retain bolts (EIPC 75-22-49, Fig/Item 13-106) 2 off and the bolt (EIPC 75-22-49, Fig/Item 13-107) that connects tube (EIPC 75-22-49, Fig/Item 13-100) to the compressor intermediate case. Refer to Fig.4. (d) Remove IP8 air tube (EIPC 75-22-49, Fig/Item 13-100). (2) Do the borescope inspection of the IP compressor stage 8 disc balance land from Direction 1. (a) Put the borescope with a forward viewing tip fitted into the intermediate case IP8 offtake hole. The vane will guide the borescope towards the rear of the IP compressor stage 8 disc. (b) Slowly move the borescope to view the balance land from Direction 1 as shown in Fig.5.**Printed in Great Britain**



# RB.211−72−G448 Page 13 Jul.26/10 Aug.21/14 RCAUTION : MAKE SURE THAT THE BORESCOPE IS NOT IN THE PATH OF ANY ROTATING COMPONENT WHEN YOU TURN THE ENGINE. IF THE BORESCOPE AND ROTATING COMPONENT TOUCH, DAMAGE TO EITHER THE ROTATING COMPONENT OR BORESCOPE WILL OCCUR. (c) Use HU43985 turning tool to slowly turn the IP compressor and inspect the balance land from Direction 1 over all the circumference of the balance land.
NOTE : Together with the inspection from Direction 2 (refer to section 3.C.(3)), you must do an inspection of Zone A of the balance land along the circumference. Refer to Fig.6. (d) Look for cracks, dents or nicks, loose balance weights and washer key (tab) locations. For acceptance criteria refer to step 3.C.(4). R R NOTE : Carefully examine the area around the balance weights. Carefully examine all around the edge of the clamp plate to make sure there is no cracking that has started R underneath the clamp plate. Fig.7, Fig.8 and Fig.9 are provided as examples. R (e) Record the results in Appendix 1. (f) Remove the borescope from the intermediate case. (3) Do the borescope inspection of the IP Compressor stage 8 disc balance land from Direction 2. (a) Put borescope with a side viewing tip fitted into HU82346, guide tube so that the tip of the borescope is just short of the guide tube end. (b) Make sure the curved end of the guide tube is towards the front of the engine and put the guide tube into the intermediate case IP8 offtake hole.
NOTE : The guide tube will need to be straightened by hand to go into the vane. (c) Push guide tube into the engine until the end of the guide tube is in the cavity behind the stage 8 disc. The guide tube will then spring back to its original shape. (d) Push borescope through the guide tube until the viewing tip emerges from the guide tube. (e) Slowly move the borescope until it views the balance land from Direction 2 as shown in Fig.5.**Printed in Great Britain**



# RB.211−72−G448 Page 14 Jul.26/10 Aug.21/14 RCAUTION : MAKE SURE THAT THE BORESCOPE IS NOT IN THE PATH OF ANY ROTATING COMPONENT WHEN YOU TURN THE ENGINE. IF THE BORESCOPE AND ROTATING COMPONENT TOUCH, DAMAGE TO EITHER THE ROTATING COMPONENT OR BORESCOPE WILL OCCUR. (f) Use HU43985 turning tool to slowly turn the IP Compressor. (g) Do an inspection of the balance land from Direction 2 along the circumference of the balance land.
NOTE : Together with inspection from Direction 1 (refer to section 3.C.(2)), do an inspection of Zone A of the balance land along the circumference. Refer to Fig.6. (h) Look for cracks, dents or nicks, loose balance weights and washer key (tab) locations. For acceptance criteria refer to step 3.C.(4). R R NOTE : Carefully examine the area around the balance weights. Carefully examine all around the edge of the clamp plate to make sure there is no cracking that has started R underneath the clamp plate. Fig.7, Fig.8 and Fig.9 are provided as examples. R (i) Record the results in Appendix 1. (j) Remove borescope until the viewing tip is inside the guide tube and then remove the borescope and guide tube through the intermediate case. (4) Acceptance criteria (a) Cracked - Reject, inform Rolls-Royce as soon as practically possible. R (b) Dented or nicked: R (i) Reject. Supply pictures of dent or nick to Rolls-Royce Technical Help Desk. R R (c) Loose balance weights (refer to Fig.9): R (i) Reject. Supply pictures of balance weights to Rolls-Royce Technical Help Desk. R R (d) Washer key (tab) locations (refer to Fig.9): R (i) One or more locking keys (tabs) limiting bolt rotation in the anti-clockwise direction - Accept R R (ii) No locking keys (tabs) limiting bolt rotation in the anti-clockwise direction - Reject. Supply pictures of balance weights to Rolls-Royce Technical Help Desk. R R R**Printed in Great Britain**



# RB.211−72−G448 Page 15 Jul.26/10 Aug.21/14 R(5) Install the IP8 air tube (EIPC 75-22-49, Fig/Item 13-100). (a) Connect tube (EIPC 75-22-49, Fig/Item 13-100) to tube (EIPC 75-22-49, Fig/Item 13-700) and tube (EIPC 75-22-49, Fig/Item 13-500). Refer to Fig.4. (b) Connect tube (EIPC 75-22-49, Fig/Item 13-100) to the compressor intermediate case with the bolts (EIPC 75-22-49, Fig/Item 13-106) 2 off and bolt (EIPC 75-22-49, Fig/Item 13-107). Refer to Fig.4. (c) Torque the bolts (EIPC 75-22-49, Fig/Item 13-106) 2 off and bolt (EIPC 75-22-49, Fig/Item 13-107) to 11,5 Nm (100 lbfin.). (d) Assemble the clip positions CP210106, CP210107, CP210101, CP210100, CP210104 and CP210105. Refer to Engine Manual, 72-00-13, Clip Position Data and Fig.4. (e) Torque tube nut on tube (EIPC 75-22-49, Fig/Item 13-700) that connects to tube (EIPC 75-22-49, Fig/Item 13-100) to 84,0 Nm (61.9 lbfft.). (f) Torque tube nut on tube (EIPC 75-22-49, Fig/Item 13-500) that connects to tube (EIPC 75-22-49, Fig/Item 13-100) to 61,0 Nm (540 lbfin.). (g) Where applicable, attach safety R tubes (EIPC 75-22-49, Fig/Item 13-500) and (EIPC 75-22-49, Fig/Item 13-700) with OMat 2/142, safety cable. (6) Accomplishment of this Non-Modification Service Bulletin should be recorded in the engine logbook. (7) Record the results of the inspection in Appendix 1. D. Eddy Current Inspection of Trent 500 and Trent 900 Engines.

CAUTION : YOU MUST USE CLEAN COTTON GLOVES WHEN YOU TOUCH THE IP COMPRESSOR SHAFT.
NOTE : Step 3.D.(1) applies to Pre SB 72-AH555 or Pre SB 72-AH561 only. All other steps apply to both Pre and Post SB 72-AH555 or SB 72-AH561. R R (1) Remove and inspect fitted balance weight assemblies. (a) Make a careful record of which balance weight and clamp are fitted at each position. Use an OMat 261, temporary marker to show the position of each balance weight on the shaft. Refer to TSD 594J, 70-00-00, OP363. (b) Record the position and weight of each of the balance weights in Appendix 2 for reference during the assembly procedure.**Printed in Great Britain**



# RB.211−72−G448 Page 16 Jul.26/10 Aug.21/14 R(c) Remove balance weight assemblies (balance weight (EIPC 72-32-31, Fig/Item 01-415, 01-417, 01-419, 01-421, 01-423, 01-425 and 01-427), clamp (EIPC 72-32-31, Fig/Item 01-455), washer (EIPC 72-32-31, Fig/Item 01-452) and bolt (EIPC 72-32-31, Fig/Item 01-450)) from the balance land. (d) Clean the balance weights and clamps in accordance with: TRENT 500 EM, 72-32-31, Cleaning TRENT 900 CIR Manual, 72-32-31, Cleaning (e) Do an inspection of the balance weights for frettage. No frettage (galling) Accept, retain weights and discard bolts and washers Frettage (galling) Reject Balance weight rejected Find and record the weight of the rejected balance weight assembly (balance weight (EIPC 72-32-31, Fig/Item 01-415, 01-417, 01-419, 01-421, 01-423, 01-425 and 01-427), clamp (EIPC 72-32-31, Fig/Item 01-455), washer (EIPC 72-32-31, Fig/Item 01-452) and bolt (EIPC 72-32-31, Fig/Item 01-450)). This is to help the Assembly process (f) Do an inspection of the clamps for bending and damage. No damage and not bent Accept Damaged or Bent Reject (2) Clean the balance land (a) Do an inspection of the balance land recess (refer to Fig.16). If the IP compressor shaft has not been cleaned, deposits in this recess will prevent the movement of the eddy current tool carriage. (b) Clean the balance land recess with OMat 154, cold paint stripper, in accordance with Overhaul Processes Manual TSD594J 70-00-00, OP117, if required, until all deposits are removed. (c) Remove all of OMat 154, cold paint stripper, as damage to the rubber tyres of the eddy current tool carriage can occur.**Printed in Great Britain**



# RB.211−72−G448 Page 17 Jul.26/10 Aug.21/14 R(3) Prepare for eddy Current Inspection. (a) Make sure the balance land is sufficiently clean to let the eddy current tool carriage move and make sure the balance weights are removed. (b) Find the centre of the IPC stage 8 blade loading slot. This is the datum position of the IPC8 disc when performing the inspection. (c) Set the Eddy Current instrument switch to on and leave it to warm up for 10 minutes or in accordance with the manufacturers instructions. Set the display to X-Y. (d) Put the PTFE adhesive tape on the face of the probe MDK1 H-1803.03.1 as shown in Fig.10. (e) Fit probe MDK-1 H-1803.03.1 into probe holder make sure the probes positioning pin safely locks into one of the probe holders positioning pin slots. Refer to Fig.11. (4) Initial probe / instrument set-up required for new probe / instrument combination. (a) Connect the probe to instrument cable.
NOTE : When the Eddy Current instrument has been on for 10 minutes or in accordance with the manufacturers instructions. (b) Set the instruments FREQUENCY to 3.0Mhz (c) Set the instrument up for the correct probe type and set the optimum instrument conditions. (d) Set the display spot position to the centre of the screen and the spot persistence to 1.0 seconds. (e) Push the FILTER button and set the HIGHPASS FILTER to Off, set the LOWPASS FILTER to 80Hz. (f) Adjust the Phase Angle and Sensitivity controls for the inspection requirements of the individual probe. (g) Set the Preamp to 0dB, Main amp to 21dB, Axis Spread to 0dB giving Total Gain 21dB. These gain values are estimates and will possibly need adjusting for the individual instruments to make sure a signal from the notch, not exceeding full screen height (FSH), can be seen.**Printed in Great Britain**



# RB.211−72−G448 Page 18 Jul.26/10 Aug.21/14 R(5) Calibration before inspection (Red Dot / White Dot set-up). (a) Set up the instrument according to the data card, Appendix 3 (or similar form) for the probe to be used. Make sure that all items have been set up correctly. Set display to X-Y. (b) Check the condition of the probe coil spring and all the support wheel tyres on the carriage. Refer to Fig.12. (c) Pull out and slowly turn the probe in the probe holder until the red dot on the probe aligns with the red dot on the probe holder. (d) Push the probe into the probe holder until the positioning pin securely locks into the positioning slot. (e) Connect the probe to instrument cable. (f) Loosen the knurled screw and slide the probe and block assembly around the slot in the positioning plate to the white dot position. (g) Slowly turn the probe and block assembly until the locking pin in block B engages into the positioning plate. Check that the white dot on block B aligns with the white dot on the positioning plate. (h) Tighten the knurled screw. (i) Turn thumbscrew A and thumbscrew B to align their datum lines to the correct position as shown in Fig.13. (j) Put the probe onto the surface of the calibration block (HU44792 for Trent 500 and HU44796 for Trent 900) with the probe coil set approximately central to the width of the face, away from the EDM Notch. Refer to Fig.14. (k) Move the probe over the notch in the face of the calibration block, and adjust the signal phase angle such that it is 10 degrees from the Vertical. Refer to Fig.15. (l) Push the probe down lightly and NULL the probe. Lift the probe a small distance from the surface and observe the lift off signal. Movement should be from left to right at an angle between the 3 o'clock and 6 o'clock position. (m) With the notch detected, adjust the Gain control to change the amplitude from the notch to approximately 100 per cent full screen height (FSH). Refer to Fig.15. (n) The sensitivity is correctly set when the maximised signal from the target rises to 100 per cent FSH as the probe is passed over the notch.**Printed in Great Britain**



# RB.211−72−G448 Page 19 Jul.26/10 Aug.21/14 R(o) Do not use the probe if correct sensitivity cannot be set, until the reason for the change has been determined. (p) Record instrument settings data on the Data Card, Appendix 3 (or similar form). (6) Balance land rear face inspection (Red Dot set-up). (a) Set up the instrument according to the data card (Appendix 3) for the probe and instrument combination to be used. (b) Confirm that all items have been set up correctly. (c) Set the display to X-Y. (d) Make sure the PTFE adhesive tape is fitted to the face of the probe and in good condition, replace if necessary. (e) Make sure the condition of the probe coil spring and all the support wheel tyres are satisfactory. (f) Pull out and slowly turn the probe in the probe holder until the red dot on the probe aligns with the red dot on the probe holder. Do not disconnect the cable.
NOTE : If the cable is disconnected the signal can be affected and the probe should be recalibrated. (g) Push the probe into the probe holder until the positioning pin safely locks into the positioning slot. (h) Loosen the knurled screw and slide the probe and block assembly around the slot in the positioning plate to the red dot position. (i) Slowly turn the probe and block assembly until the locking pin in block B engages into the positioning plate. (j) Make sure that the red dot on block B aligns with the red dot on the positioning plate. (k) Tighten the knurled screw. (l) Turn thumbscrew A and thumbscrew B to align their datum lines to the correct position as shown in Fig.18. (m) Find the stage 8 discs datum position. Refer to section 3.D.(3).(b). (n) Carefully place the probe carriage over the balance land and locate the large horizontal wheel in the balance land recess. Refer to Fig.17 and Fig.18.**Printed in Great Britain**



# RB.211−72−G448 Page 20 Jul.26/10 Aug.21/14 R(o) Push down on the carriage until the probe tip is seated flush with the surface. (p) Null the probe. See if the probe is touching by lifting the probe holder a small distance from the surface. This must lead to a large movement of the spot on the display screen at an angle between the 3 o'clock and 6 o'clock position. (q) Push the probe trolley around the balance land to perform the scan. Start from the datum position. (r) Make sure you do a full 360 degree inspection of the balance land.
NOTE : The probe must always be moving at approximately 5 cm to 15 cm per second to detect cracking. Special attention must be paid to the areas where the balance weight(s) were removed. (s) If you turn the trolley around the balance land in one direction only, make sure the cable does not become wound up. (t) Set the probe to the next increment by turning Thumbscrew A half a turn counter clockwise. This increments the probe radially inwards. (u) Make sure the datum line on the probe holder has moved with respect to the vernier marks on Block A. Refer to Fig.18 (view B). (v) The scan starts from the radially outward edge of the face and increments radially inwards. Repeat sections 3.D.(6)(q) to 3.D.(6)(u) until the complete face is inspected. The complete face must be inspected. This will typically require 12 scan increments. (w) Record any crack indications seen in Appendix 2. If an indication is seen, refer to Accomplishment Instructions, 3.D.(9) and 3.D.(10). (7) Land Recess Outside Diameter Inspection (White Dot set-up). (a) Set up the instrument according to the data card (Appendix 3) for the probe and instrument combination to be used. (b) Confirm that all items are set up correctly. (c) Set the display to X-Y. (d) Make sure the PTFE adhesive tape is fitted to the face of the probe and in good condition, replace if necessary. (e) Check the condition of the probe coil spring and all the support wheel tyres.**Printed in Great Britain**



# RB.211−72−G448 Page 21 Jul.26/10 Aug.21/14 R(f) Without disconnecting the cable, pull out and slowly turn the probe in the probe holder until the white dot on the probe aligns with the white dot on the probe holder.
NOTE : If the cable is disconnected the signal can be affected and the probe must be recalibrated. (g) Push the probe into the probe holder until the positioning pin securely locks into the positioning slot. (h) Loosen the knurled screw and slide the probe and block assembly around the slot in the positioning plate to the white dot position. (i) Slowly turn the probe and block assembly until the locking pin in block B engages into the positioning plate. (j) Make sure the white dot on block B aligns with the white dot on the positioning plate. (k) Tighten the knurled screw. (l) Turn thumbscrew A and thumbscrew B to align their datum lines to the correct position as shown in Fig.20. (m) Identify the stage 8 discs datum position. Refer to section 3.D.(3).(b). (n) Carefully place the probe carriage on the balance land and engage the large horizontal wheel in the balance land recess. Refer to Fig.19 and Fig.20. (o) Push down on the probe until it is seated on the outside diameter face. (p) Null the probe. See if the probe is touching by lifting the probe holder a small distance from the surface, which must lead to a large movement of the spot on the display screen at an angle between the 3 o'clock and 6 o'clock position. (q) Starting from the datum position, push the probe trolley around the balance land to perform the scan. (r) Make sure you do a full 360 degree inspection of the balance land.
NOTE : The probe must always be moving at approximately 5 cm to 15 cm per second to detect cracking. Special attention must be paid to the areas where the balance weight(s) were removed. (s) If you turn the trolley around the balance land in one direction only, make sure the cable does not become wound up.**Printed in Great Britain**



# RB.211−72−G448 Page 22 Jul.26/10 Aug.21/14 R(t) Set the probe to the next increment by turning Thumbscrew A half a turn anticlockwise. This increments the probe axially forwards. (u) Make sure the datum line on the probe holder has moved with respect to the vernier marks on Block A. Refer to Fig.20 (view B). (v) The scan starts from the rearwards edge of the outer diameter face and increments forwards towards the disc diaphragm. Repeat sections 3.D.(7)(q) to 3.D.(7)(u) until the complete face is inspected. The complete face must be inspected. This will typically require 6 scan increments. (w) Record any crack indications seen in Appendix 2. If an indication is seen, refer to Accomplishment Instructions, 3.D.(9) and 3.D.(10). (8) Balance Land Chamfer Face Inspection (Blue Dot set-up). (a) Set up the instrument according to the data card (Appendix 3) for the probe and instrument combination to be used. (b) Make sure that all items are set up correctly. (c) Set the display to X-Y. (d) Make sure the PTFE adhesive tape is fitted to the face of the probe and in good condition, replace if necessary. (e) Check the condition of the probe coil spring and all the support wheel tyres. (f) Pull out and slowly turn the probe in the probe holder until the blue dot on the probe aligns with the blue dot on the probe holder. Do not disconnect the cable.
NOTE : If the cable is disconnected the signal can be affected and the probe must be recalibrated. (g) Push the probe into the probe holder until the positioning pin safely locks into the positioning slot. (h) Loosen the knurled screw and slide the probe and block assembly around the slot in the positioning plate to the blue dot position. (i) Slowly turn the probe and block assembly until the locking pin in block B engages into the positioning plate. (j) Make sure the blue dot on block B aligns with the blue dot on the positioning plate. (k) Tighten the knurled screw.**Printed in Great Britain**



# RB.211−72−G448 Page 23 Jul.26/10 Aug.21/14 R(l) Turn thumbscrew A and thumbscrew B to align their datum lines to the correct position as shown in Fig.22. (m) Find the stage 8 discs datum position. Refer to section 3.D.(3).(b). (n) Carefully place the probe carriage on the balance land and engage the large horizontal wheel in the balance land recess. Refer to Fig.21 and Fig.22. (o) Push down on the probe until it is seated on the chamfer face. (p) Null the probe. See if the probe is touching by lifting the probe holder a small distance from the surface, which must lead to a large movement of the spot on the display screen at an angle between the 3 o'clock and 6 o'clock position. (q) Push the probe trolley around the balance land to perform the scan. Start from the datum position. (r) Make sure you do a full 360 degrees inspection of the balance land.
NOTE : The probe must always be moving at approximately 5 cm to 15 cm per second to detect any cracking. Special attention must be paid to the areas where the balance weight(s) were removed. (s) If you turn the trolley around the balance land in one direction only, make sure the cable does not become wound up. (t) Set the probe to the next increment by turning Thumbscrew B half a turn clockwise. This increments the probe towards the disc. (u) Make sure the datum line on block A has moved with respect to the vernier marks on block B. Refer to Fig.22 (view B). (v) The scan starts from the rearward edge of the chamfer face and increments forwards towards the disc. Repeat sections 3.D.(8)(q) to 3.D.(8)(u) until the complete face is inspected. The complete face must be inspected. This will typically require 4 scan increments. (w) Record any crack indications seen in Appendix 2. If an indication is seen, refer to Accomplishment Instructions, 3.D.(9) and 3.D.(10). (x) Do a post inspection calibration check by performing section 3.D.(5). If the signal result is not the same as the calibration result before inspection, then calibrate again in accordance with section 3.D.(5) and a full inspection of the balance land is required.**Printed in Great Britain**



# RB.211−72−G448 Page 24 Jul.26/10 Aug.21/14 R(9) Interpretation of the Eddy Current Instrument CRT Screen Display. (a) Defects will be seen again and again and show on the X-Y display as a signal rising between vertical and 10 degrees from the vertical from the centre spot, as the probe passes over the defect (refer to Fig.23). To confirm an indication as genuine, make sure the area is clean and the signal is seen again and again. (b) Transient signals can be seen which can look similar to defects. You can ignore these signals as they will not be seen again and again. (c) As the probe passes over the scallop areas of the balance land face (refer to Fig.21 view A), a signal moving in a downward and opposite direction to a defect indication will be seen. Refer to Fig.24. (d) Carefully monitor as defects can occur within the scalloped area. Refer to Fig.25 for example of defects within a scallop area. (10) Determining if an indication is spurious or genuine If an indication is found in section 3.D.(6), (7) or (8), and passes the inspections in section 3.D.(9), then use the following procedure to determine if the indication is spurious or a genuine crack signal. (a) Set the HIGHPASS FILTER to ON and set the frequency to 5 Hz. (b) Set the LOWPASS FILTER frequency to 50 Hz. (c) Set up the inspection tool ready for use on the calibration block in accordance with 3.D.(5)(c) to 3.D.(5)(i). (d) Put the probe onto the surface of the calibration block (HU44792 for Trent 500 and HU44796 for Trent 900) with the probe coil set approximately central to the width of the face, away from the EDM notch. refer to Fig.14. (e) Push the probe down lightly and NULL the probe. (f) Move the probe over the notch in the face of the calibration block and adjust the phase angle so that the notch signal is vertical. (g) Adjust the gain so that the notch signal is at full screen height. (h) Inspect the area on the balance land again only where the indication was found: (i) If a vertical signal is seen in this area, the indication must be a genuine crack signal.**Printed in Great Britain**



# RB.211−72−G448 Page 25 Jul.26/10 Aug.21/14 R(ii) If no vertical signal can be seen in this area, then the indication found in section 3.D.(6), (7) or (8) must be a spurious signal and must be ignored.
NOTE : With the HIGHPASS filter set to ON, the probe lift-off will show as a vertical spot movement, therefore take care not to interpret the lift-off of the probe as a crack signal. (11) Acceptance criteria. If an indication is identified as a crack signal following steps 3.D.(9) and 3.D.(10), the Shaft must be rejected. Do not complete section 3.D.(12) and perform any dressing repair of damage or fretting masks. The IP compressor shaft, balance weights, clamp plates, washers and bolts must be quarantined. The location shall be visually inspected and the results reported to Rolls-Royce via your local representative. (12) Do an inspection of the balance land. (a) Do a visual inspection of the balance land rear face, chamfer face and recess outside diameter (refer to Fig.16) look for damage, indentation marks and galling. Use a 10x magnifying glass and a torch (if required). (b) For acceptance criteria refer to: TRENT 500 Engine Manual, 72-32-31, Inspection TRENT 900 CIR Manual, 72-32-31, Inspection (c) If the IP compressor shaft is rejected, quarantine the IP compressor shaft, balance weights, clamp plates, washers and bolts. Photograph the mark and send the image to Rolls-Royce via your local representative. (13) Install the balance weight and the clamp on IP Compressor Shaft (EIPC 72-32-31, Fig/Item 01-180), in the same position as removed. (a) If one or all of the balance weights have been rejected following inspection (refer to section 3.D.(1).(e)), a new balance weight must be used. The weight of the new balance weight assembly (balance weight, clamp, washer and bolt) must be within 0,1 g (0.003 oz) of the original balance weight assembly. (b) Install the balance weights (EIPC 72-32-31, Fig/Item 01-415, 01-417, 01-419, 01-421, 01-423, 01-425 and 01-427), clamp (EIPC 72-32-31, Fig/Item 01-455) with new bolts (EIPC 72-32-31, Fig/Item 01-450) and new locking washers (EIPC 72-32-31, Fig/Item 01-452) in the same position as where they were removed from on the inspected and serviceable IP compressor drum.**Printed in Great Britain**



# RB.211−72−G448 Page 26 Jul.26/10 Aug.21/14 R(c) Torque tighten the bolts to 4 Nm (35 lbfin.). Refer to Standard Practices Manual, 70-51-00, Torque Tighten Components. (d) Use the locking washers (EIPC 72-32-31, Fig/Item 01-452), to lock the bolts (EIPC 72-32-31, Fig/Item 01-450), in position. Refer to Standard Practices Manual, 70-12-04, Procedures used to Lock Threaded Parts. (e) Make sure all temporary markings produced in section 3.D.(1) are removed. (14) If one or all of the acceptance criteria in sections 3.D.(11) and 3.D.(12) are not met; retain and quarantine the balance weights (EIPC 72-32-31, Fig/Item 01-415, 01-417, 01-419, 01-421, 01-423, 01-425 and 01-427), clamp (EIPC 72-32-31, Fig/Item 01-455), bolts (EIPC 72-32-31, Fig/Item 01-450), locking washers (EIPC 72-32-31, Fig/Item 01-452) and IP compressor shaft (EIPC 72-32-31, Fig/Item 01-180). Refer to Rolls-Royce via your local representative within 2 weeks of the inspection. (15) Record the condition of the balance land on the attached inspection sheet provided in Appendix 2 or similar form. E. Accomplishment of this Non-Modification Service Bulletin is to be recorded in the engine logbook.**Printed in Great Britain**



# RB.211−72−G448 Page 27 Jul.26/10 Aug.21/14 RTrent 500 - Location of IP8 Buffer Air Tube Fig.1**Printed in Great Britain**



# RB.211−72−G448 Page 28 Jul.26/10 Aug.21/14 RJointing Compound Application Fig.2**Printed in Great Britain**



# RB.211−72−G448 Page 29 Jul.26/10 Aug.21/14 RClip Position CP101919 Fig.3**Printed in Great Britain**



# RB.211−72−G448 Page 30 Jul.26/10 Aug.21/14 Rdeh0009427 210106

210107

210101 210100 210104 210103

210105



## A **B B**  **A**

COMPRESSOR INTERMEDIATE CASE 72−33−10 TUBE FW48296

13−500 TUBE FW24803

13−100

TUBE FW30489

13−700 BOLT AS48512 13−107

BOLT AS48528 13−106 (2 off)

TUBE FW24803

13−100 **NOTE:** All IPC Fig/Item numbers are 75−22−49 unless identified differently **NOTE:** All Chapter−Section−Subject and Fig−Item references are quoted for the **Engine IPC** 02−500 SB 72−C994

FW18047 SB 72−D131

FW15202 SB 72−F434 PTI FW62836 SB 72−F434 PT2 FW63495

Trent 900 - Location of IP8 Buffer Air Tube Fig.4**Printed in Great Britain**



# RB.211−72−G448 Page 31 Jul.26/10 Aug.21/14 RTrent 500 and Trent 900 - Borescope View Directions Fig.5**Printed in Great Britain**



# RB.211−72−G448 Page 32 Jul.26/10 Aug.21/14 RTrent 500 and Trent 900 - Inspection of Zone A Fig.6**Printed in Great Britain**



# RB.211−72−G448 Page 33 Jul.26/10 Aug.21/14 RR

Previously Seen Crack Position on Trent 700 Engine R (Rear Face Location) R Fig.7 R**Printed in Great Britain**



# RB.211−72−G448 Page 34 Jul.26/10 Aug.21/14 RR

Previously Seen Crack Position on Trent 800 Engine R (Recess Outside Diameter Location) R Fig.8 R**Printed in Great Britain**



# RB.211−72−G448 Page 35 Jul.26/10 Aug.21/14 RR

Example of a Properly Fitted Balance Weight Assembly R Fig.9 (sheet 1 of 2) R**Printed in Great Britain**



# RB.211−72−G448 Page 36 Jul.26/10 Aug.21/14 RR

Example of Acceptable Locking Washer Key (Tab) Locations R Fig.9 (sheet 2 of 2) R**Printed in Great Britain**



# RB.211−72−G448 Page 37 Jul.26/10 Aug.21/14 RTeflon Tape Attached to Probe Fig.10**Printed in Great Britain**



# RB.211−72−G448 Page 38 Jul.26/10 Aug.21/14 RProbe Positioning Pin and Probe Holder Positioning Pin Slot Fig.11**Printed in Great Britain**



# RB.211−72−G448 Page 39 Jul.26/10 Aug.21/14 REddy Current Inspection Tool Fig.12**Printed in Great Britain**



# RB.211−72−G448 Page 40 Jul.26/10 Aug.21/14 REddy Current Tool Positioned for Calibration Fig.13**Printed in Great Britain**



# RB.211−72−G448 Page 41 Jul.26/10 Aug.21/14 REddy Current Calibration Block - HU44792 (Trent 500) and HU44796 (Trent 900) Fig.14**Printed in Great Britain**



# RB.211−72−G448 Page 42 Jul.26/10 Aug.21/14 RTypical Calibration Display Fig.15**Printed in Great Britain**



# RB.211−72−G448 Page 43 Jul.26/10 Aug.21/14 RTrent 500 and Trent 900 - Balance Land Inspection Zones Fig.16**Printed in Great Britain**



# RB.211−72−G448 Page 44 Jul.26/10 Aug.21/14 RProbe Placed to Inspect Balance Land Rear Face Fig.17**Printed in Great Britain**



# RB.211−72−G448 Page 45 Jul.26/10 Aug.21/14 RProbe Placed to Inspect Balance Land Rear Face Fig.18**Printed in Great Britain**



# RB.211−72−G448 Page 46 Jul.26/10 Aug.21/14 RProbe Placed to Inspect Balance Land Recess Outside Diameter Fig.19**Printed in Great Britain**



# RB.211−72−G448 Page 47 Jul.26/10 Aug.21/14 RProbe Placed to Inspect Balance Land Recess Outside Diameter Fig.20**Printed in Great Britain**



# RB.211−72−G448 Page 48 Jul.26/10 Aug.21/14 RProbe Placed to Inspect Balance Land Chamfer Face Fig.21**Printed in Great Britain**



# RB.211−72−G448 Page 49 Jul.26/10 Aug.21/14 RProbe Placed to Inspect Balance Land Chamfer Face Fig.22**Printed in Great Britain**



# RB.211−72−G448 Page 50 Jul.26/10 Aug.21/14 RDefect Indication in Outside Diameter as Seen on Screen Display Fig.23**Printed in Great Britain**



# RB.211−72−G448 Page 51 Jul.26/10 Aug.21/14 RTypical Screen Display as the Probe Passes Over a Scallop Area Fig.24**Printed in Great Britain**



# RB.211−72−G448 Page 52 Jul.26/10 Aug.21/14 RDefect Indication Within a Scallop Area Fig.25**Printed in Great Britain**



# RB.211−72−G448 Page 53 Jul.26/10 Aug.21/14 RTrent 500 or Trent 900 Visual Borescope Inspection Results
1. This Form is to be completed for every engine inspected in accordance with Accomplishment Instructions (3.B. or 3.C.). 2. Results to be sent to Rolls-Royce via your local representative.

See over APPENDIX 1**Printed in Great Britain**



# RB.211−72−G448 Appendix 1 - Page 1 of 2 Jul.26/10 Aug.21/14 RR

Borescope Inspection - Feedback Sheet R**Printed in Great Britain**



# RB.211−72−G448 Appendix 1 - Page 2 Jul.26/10 Aug.21/14 RTrent 500 or Trent 900 Eddy Current Inspection Results
1. This Form is to be completed for every shaft inspected in accordance with Accomplishment Instructions (3.D.). 2. Results to be sent to Rolls-Royce via your local representative.

See over APPENDIX 2**Printed in Great Britain**



# RB.211−72−G448 Appendix 2 - Page 1 of 2 Jul.26/10 Aug.21/14 REddy Current Inspection - Feedback Sheet**Printed in Great Britain**



# RB.211−72−G448 Appendix 2 - Page 2 Jul.26/10 Aug.21/14 RNDT Data Card - Eddy Current Inspection Results
1. This Form is to be completed for each new combination of probe and instrument. 2. Results to be retained at the overhaul base.

See over APPENDIX 3**Printed in Great Britain**



# RB.211−72−G448 Appendix 3 - Page 1 of 2 Jul.26/10 Aug.21/14 RNDT Data Card**Printed in Great Britain**



# RB.211−72−G448 Appendix 3 - Page 2 Jul.26/10 Aug.21/14 R