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

Bulletin 1 Sep.14/12 2 Sep.14/12 3 Sep.14/12 4 Sep.14/12 5 Sep.14/12 6 Sep.14/12 7 Sep.14/12 8 Sep.14/12 9 Sep.14/12 10 Sep.14/12 11 Sep.14/12 12 Sep.14/12 13 Sep.14/12 14 Sep.14/12 15 Sep.14/12 16 Sep.14/12 Appendix 1 1 Sep.14/12**Printed in Great Britain**



# RB.211−72−AH054 Transmittal - Page 21. Planning Information A. Effectivity Airbus A380 All RB211 TRENT 900 Engines
B. Reason In response to a service event where material loss was seen on the LP turbine stage 2 disc seal fin an intrascope inspection technique of the affected areas has been developed. An inspection of the LP turbine in accordance with 3.A. Accomplishment Instructions of this NMSB is recommended at overhaul as part of fleet wide containment actions. C. Description This Non Modification Service Bulletin (NMSB) inspection should be applied at Level 1 serviceability on all Trent 900 engine 08 modules at every overhaul. It is intended to build an understanding of the condition of the LP turbine disc seal fins and inter stage seals across the Trent 900 fleet. This inspection is recommended in addition to the existing gas path intrascope of the LP turbine that is part of the existing workscope for Level 1 serviceability of the 08 Module. The intrascope inspection involves entering the four inter stage seal cavities of the LP turbine. To record results of the inspection, return Appendix 1 (or similar form) to your Rolls-Royce Service Representative. D. Compliance
ALERT This Non-Modification Service Bulletin is anticipated to be the subject of an EASA Airworthiness Directive. Rolls-Royce recommends that the following action is undertaken to maintain reliability. TRENT 900 INTRASCOPE INSPECTION OF LP TURBINE DISC SEAL FINS - NON-MODIFICATION SERVICE BULLETIN - NON - MOD.72-AH054**Printed in Great Britain**



# RB.211−72−AH054 Page 1 of 16 Sep.14/12 Sep.14/12Inspection of the LP turbine disc seal fins should be carried out in accordance with the accomplishment instructions in sections 3.A. as follows: All Trent 900 engines at overhaul where the 08 module has a minimum of a Level 1 serviceability workscope. Any 08 modules that have had this inspection to repeater TV125658 prior to issue of this NMSB and have not returned to overhaul following further engine running are deemed as compliant with the NMSB, otherwise the inspection should be performed again. E. Approval The technical content of this Non-Modification Service Bulletin was approved under the authority of Design Organisation Approval EASA.21J.035 on Sep.11/12. F. Manpower (1) Time to inspect 2 hours (1 person) G. Material Price and Availability Not applicable H. Tooling Price and Availability (1) Flexible Videoscope Diameter 4 mm (0.16in.) with forward and side viewing tips. Recommend either Olympus IPLEX FX 4.0 mm Videscope or Everest XL/GO 3.9 mm Videoscope. (2) Nylon Guide Tube, maximum 9 mm diameter x minimum 5mm diameter x 300 mm long. I. References Engine Manual (1) 72-52-21-01 LP Turbine Cases, Engine Illustrated Parts Data (2) 72-52-21-02 LP Turbine Cases, Engine Illustrated Parts Data (3) 70-00-00-100-101 Overhaul Process 101, Non-aqueos Vapour and Liquid Degreasing**Printed in Great Britain**



# RB.211−72−AH054 Page 2 Sep.14/12 Sep.14/122. Material Information A. Consumable Materials OMat 4/62 - Anti-seize Compound**Printed in Great Britain**



# RB.211−72−AH054 Page 3 Sep.14/12 Sep.14/123. Accomplishment Instructions A. In-shop (1) This task contains the inspection/check procedure to do an intrascope inspection of the LP turbine disc seal fins. (2) Use intrascope inspection equipment to do a visual inspection of the LP turbine disc seal fins. (3) The inspection of the four LP turbine disc seal fin cavities is through four intrascope positions on the LP turbine outer case (EIPC 72-52-21, 01-060). (4) It is necessary to turn the LP compressor to examine the seal fins. (5) Prepare the Intrascope Equipment: (a) Assemble the intrascope inspection equipment: (b) Prepare the intrascope equipment to the Manufacturer's Instructions. (6) Prepare to Examine the LP turbine disc seal fins (a) Turn the LP system:
WARNING : YOU MUST USE APPLICABLE GLOVES WHEN YOU HOLD THE LOW PRESSURE (LP) COMPRESSOR BLADES. THE LEADING EDGES OF THE BLADES ARE SHARP AND CAN CAUSE INJURY. Use your hands to turn the LP compressor. (7) Examine the LP turbine disc seal fins (a) Refer to the table below and Fig.1 for the locations to be examined. Cold build seal clearances are included for additional information:
Inspection Area Access View Area Cold Build Seal Clearances

1 LP 2S Stage 2 Inter Stage Seal (ISS) and Stage 2 disc seal fin 1,1**Printed in Great Britain**



# RB.211−72−AH054 Page 4 Sep.14/12 Sep.14/122 LP 3S Stage 3 Inter Stage Seal (ISS) and Stage 2 disc seal fin 1,25

3 LP 4S Stage 4 Inter Stage Seal (ISS) and Stage 4 disc seal fin 1,45

4 LP 5S Stage 5 Inter Stage Seal (ISS) and Stage 4 disc seal fin 4,55

(8) Do an inspection of the Stage 2 Inter Stage Seal (ISS) and Stage 2 disc seal fin, see Fig.2 (a) Remove the LP2 turbine intrascope access blanking plug (72-52-21, 02-050) from the LP turbine outer case (72-52-21, 01-060).
CAUTION : YOU MUST MAKE SURE THAT THE INTRASCOPE PROBE TIP IS NOT IN THE PATH OF THE DISC SEAL FIN WHEN YOU TURN THE ENGINE. IF THE INTRASCOPE PROBE AND SEAL FIN TOUCH, DAMAGE TO THE FIN/INTRASCOPE PROBE WILL OCCUR. (b) Attach a forward viewing tip to the intrascope. (c) Insert the intrascope into the guide tube. (d) Insert the intrascope into the LP 2S intrascope port; shape the guide tube until you can view the gap between the leading edge inner platform of the stage 2 blades and the rear of the stage 2 LP turbine NGV trailing edge platform. (e) Steady the guide tube while retracting the intrascope, change the viewing tip to a side tip. (f) Insert the intrascope into the guide tube advancing it until you go in between the front of the stage 2 blades and the rear of the stage 2 vane. (g) Articulate the intrascope until you gain a view of the stage 2 disc seal fin. (h) Turn the LP system as given in step (6). View the entire circumference of the disc seal fin.**Printed in Great Britain**



# RB.211−72−AH054 Page 5 Sep.14/12 Sep.14/12(i) Examine the stage 2 disc seal fin for: Cracks Damage (j) The accept reject standards: No cracks or material loss from sections of the disc seal fin - Accept Any cracks on disc seal fin - Reject Any material loss from sections of the disc seal fin - Reject (k) When you have completed the intrascope inspection, carefully remove the intrascope probe. (l) Clean the mating faces of the LP2 intrascope access blanking plug (72-52-21, 02-050) and the LP turbine outer case (72-52-21, 01-060). Use the swab degrease procedure given in OP Task 70-00-00-100-101, Subtask 70-00-00-110-101-A03.
CAUTION : YOU MUST FIND AND OBEY THE MANUFACTURER'S HEALTH AND SAFETY DATA FOR THE MATERIALS. YOU MUST ALSO REFER TO LOCAL REGULATIONS TO MAKE SURE THAT THE PROCEDURES ARE DONE SAFELY. IF YOU DO NOT DO THIS, AN INJURY OR ENVIRONMENTAL DAMAGE CAN OCCUR.
CAUTION : DO NOT PUT TOO MUCH ANTI-SEIZE COMPOUND ON TO THE LP2 INTRASCOPE ACCESS BLANKING PLUG THREAD. IF TOO MUCH COMPOUND IS APPLIED, IT COULD GO INTO THE ENGINE AND CAUSE DAMAGE. (m) Apply with a brush a thin layer of OMat 4/62 Anti-seize compound to: (i) The location surface of the LP2 turbine intrascope access blanking plug (72-52-21, 02-050) end. (ii) The mating face of the LP2 turbine intrascope access blanking plug (72-52-21, 02-050). (iii) The mating face of the LP turbine outer case (72-52-21, 01-060). (n) Put the LP2 turbine intrascope access blanking plug (72-52-21, 02-050) in the LP turbine outer case (72-52-21, 01-060). (o) Torque the LP2 turbine intrascope access blanking plug (72-52-21, 02-050) to 26 Nm (230 lbfin).**Printed in Great Britain**



# RB.211−72−AH054 Page 6 Sep.14/12 Sep.14/12(9) Do an inspection of the Stage 3 Inter Stage Seal (ISS) and Stage 2 disc seal fin see Fig.3: (a) Remove the LP3 turbine intrascope access blanking plug (72-52-21, 02-100) from the LP turbine outer case (72-52-21, 01-060).
CAUTION : YOU MUST MAKE SURE THAT THE INTRASCOPE PROBE TIP IS NOT IN THE PATH OF THE DISC SEAL FIN WHEN YOU TURN THE ENGINE. IF THE INTRASCOPE PROBE AND SEAL FIN TOUCH, DAMAGE TO THE FIN/INTRASCOPE PROBE WILL OCCUR. (b) Attach a forward viewing tip to the intrascope. (c) Insert the intrascope into the guide tube. (d) Insert the intrascope into the LP 3S intrascope port; shape the guide tube until you can view the gap between the leading edge inner platform of the stage 3 blades and the rear of the stage 3 LP turbine NGV trailing edge platform. (e) Steady the guide tube while retracting the intrascope, change the viewing tip to a side tip. (f) Insert the intrascope into the guide tube advancing it until you go in between the front of the stage 3 blades and the rear of the stage 3 vane. (g) Articulate the intrascope until you gain a view of the stage 2 disc seal fin. (h) Turn the LP system as given in step (6). View the entire circumference of the disc seal fin. (i) Examine the stage 2 disc seal fin for: Cracks Damage (j) The accept reject standards: No cracks or material loss from sections of the disc seal fin - Accept Any cracks on disc seal fin - Reject Any material loss from sections of the disc seal fin - Reject (k) When you have completed the intrascope inspection, carefully remove the intrascope probe.**Printed in Great Britain**



# RB.211−72−AH054 Page 7 Sep.14/12 Sep.14/12(l) Clean the mating faces of the LP3 intrascope access blanking plug (EIC 72-52-21, 02-100) and the LP turbine outer case (EIPC 72-52-21, 01-060). Use the swab degrease procedure given in OP Task 70-00-00-100-101, Subtask 70-00-00-110-101-A03.
WARNING : YOU MUST FIND AND OBEY THE MANUFACTURERS HEALTH AND SAFETY DATA FOR THE MATERIALS. YOU MUST ALSO REFER TO LOCAL REGULATIONS TO MAKE SURE THAT THE PROCEDURES ARE DONE SAFELY. IF YOU DO NOT DO THIS, AN INJURY OR ENVIRONMENTAL DAMAGE CAN OCCUR.
CAUTION : DO NOT PUT TOO MUCH ANTI0SEIZE COMPOUND ON TO THE LP3 INTRASCOPE ACCESS BLANKING PLUG THREAD. IF TOO MUCH COMPOUND IS APPLIED, IT COULD GO INTO THE ENGINE AND CAUSE DAMAGE. (m) Apply with a brush a thin layer of OMat 4/62 Anti-seize compound to: (i) The location surface of the LP3 turbine intrascope access blanking plug (72-52-21, 02-100) end. (ii) The mating face of the LP3 turbine intrascope access blanking plug (72-52-21, 02-100) (iii) The mating face of the LP turbine outer case (72-52-21, 01-060). (n) Put the LP3 turbine intrascope access blanking plug (72-52-21, 02-100) in the LP turbine outer case (72-52-21, 01-060). (o) Torque the LP3 turbine intrascope access blanking plug (72-52-21, 02-100) to 26 Nm (230 lbfin). (10) Do an inspection of the Stage 4 Inter Stage Seal (ISS) and Stage 4 disc seal fin see Fig.4: (a) Remove the LP4 turbine intrascope access blanking plug (72-52-21, 02-150) from the LP turbine outer case (72-52-21, 01-060).
CAUTION : YOU MUST MAKE SURE THAT THE INTRASCOPE PROBE TIP IS NOT IN THE PATH OF THE DISC SEAL FIN WHEN YOU TURN THE ENGINE. IF THE INTRASCOPE PROBE AND SEAL FIN TOUCH, DAMAGE TO THE FIN/INTRASCOPE PROBE WILL OCCUR. (b) Attach a forward viewing tip to the intrascope. (c) Insert the intrascope into the guide tube. (d) Insert the intrascope into the LP 4S intrascope port; shape the guide tube until you can view the gap between the leading edge inner platform of the stage 4 blades and the rear of the stage 4 LP turbine NGV trailing edge platform**Printed in Great Britain**



# RB.211−72−AH054 Page 8 Sep.14/12 Sep.14/12(e) Steady the guide tube while retracting the intrascope, change the viewing tip to a side tip. (f) Insert the intrascope into the guide tube advancing it until you go in between the front of the stage 4 blades and the rear of the stage 4 vane. (g) Articulate the intrascope until you gain a view of the stage 4 disc seal fin. (h) Turn the LP system as given in step (6). View the entire circumference of the disc seal fin. (i) Examine the stage 4 disc seal fin for: Cracks Damage (j) The accept reject standards: No cracks or material loss from sections of the disc seal fin - Accept Any cracks on disc seal fin - Reject Any material loss from sections of the disc seal fin - Reject (k) When you have completed the intrascope inspection, carefully remove the intrascope probe. (l) Clean the mating faces of the LP4 intrascope access blanking plug (72-52-21, 02-150) and the LP turbine outer case (72-52-21, 01-060). Use the swab degrease procedure given in OP Task 70-00-00-100-101, Subtask 70-00-00-110-101-A03.
CAUTION : YOU MUST FIND AND OBEY THE MANUFACTURER'S HEALTH AND SAFETY DATA FOR THE MATERIALS. YOU MUST ALSO REFER TO LOCAL REGULATIONS TO MAKE SURE THAT THE PROCEDURES ARE DONE SAFELY. IF YOU DO NOT DO THIS, AN INJURY OR ENVIRONMENTAL DAMAGE CAN OCCUR.
CAUTION : DO NOT PUT TOO MUCH ANTI-SEIZE COMPOUND ON TO THE LP4 INTRASCOPE ACCESS BLANKING PLUG THREAD. IF TOO MUCH COMPOUND IS APPLIED, IT COULD GO INTO THE ENGINE AND CAUSE DAMAGE. (m) Apply with a brush a thin layer of OMat 4/62 Anti-seize compound to: (i) The location surface of the LP4 turbine intrascope access blanking plug (72-52-21, 02-150) end. (ii) The mating face of the LP4 turbine intrascope access blanking plug (72-52-21, 02-050).**Printed in Great Britain**



# RB.211−72−AH054 Page 9 Sep.14/12 Sep.14/12(iii) The mating face of the LP turbine outer case (72-52-21, 01-060). (n) Put the LP4 turbine intrascope access blanking plug (72-52-21, 02-150) in the LP turbine outer case (72-52-21, 01-060). (o) Torque the LP4 turbine intrascope access blanking plug (72-52-21, 02-150) to 26 Nm (230 lbfin). (11) Do an inspection of the Stage 5 Inter Stage Seal (ISS) and Stage 4 disc seal fin see Fig.5 (a) Remove the LP5 turbine intrascope access blanking plug (72-52-21, 02-180) from the LP turbine outer case (72-52-21, 01-060).
CAUTION : YOU MUST MAKE SURE THAT THE INTRASCOPE PROBE TIP IS NOT IN THE PATH OF THE DISC SEAL FIN WHEN YOU TURN THE ENGINE. IF THE INTRASCOPE PROBE AND SEAL FIN TOUCH, DAMAGE TO THE FIN/INTRASCOPE PROBE WILL OCCUR. (b) Attach a forward viewing tip to the intrascope. (c) Insert the intrascope into the guide tube. (d) Insert the intrascope into the LP5 intrascope port; shape the guide tube until you can view the gap between the leading edge inner platform of the stage 5 blades and the rear of the stage 5 LP turbine NGV trailing edge platform. (e) Steady the guide tube while retracting the intrascope, change the viewing tip to a side tip. (f) Insert the intrascope into the guide tube advancing it until you go in between the front of the stage 5 blades and the rear of the stage 5 vane. (g) Articulate the intrascope until you gain a view of the stage 4 disc seal fin. (h) Turn the LP system as given in step (6). View the entire circumference of the disc seal fin. (i) Examine the stage 4 disc seal fin for: Cracks Damage (j) The accept reject standards: No cracks or material loss from sections of the disc seal fin - Accept**Printed in Great Britain**



# RB.211−72−AH054 Page 10 Sep.14/12 Sep.14/12Any cracks on disc seal fin - Reject Any material loss from sections of the disc seal fin - Reject (k) When you have completed the intrascope inspection, carefully remove the intrascope probe. (l) Clean the mating faces of the LP5 intrascope access blanking plug (72-52-21, 02-180) and the LP turbine outer case (72-52-21, 01-060). Use the swab degrease procedure given in OP Task 70-00-00-100-101, Subtask 70-00-00-110-101-A03.
CAUTION : YOU MUST FIND AND OBEY THE MANUFACTURER'S HEALTH AND SAFETY DATA FOR THE MATERIALS. YOU MUST ALSO REFER TO LOCAL REGULATIONS TO MAKE SURE THAT THE PROCEDURES ARE DONE SAFELY. IF YOU DO NOT DO THIS, AN INJURY OR ENVIRONMENTAL DAMAGE CAN OCCUR.
CAUTION : DO NOT PUT TOO MUCH ANTI-SEIZE COMPOUND ON TO THE LP5 INTRASCOPE ACCESS BLANKING PLUG THREAD. IF TOO MUCH COMPOUND IS APPLIED, IT COULD GO INTO THE ENGINE AND CAUSE DAMAGE. (m) Apply with a brush a thin layer of OMat 4/62 Anti-seize compound to: (i) The location surface of the LP5 turbine intrascope access blanking plug (72-52-21, 02-180) end. (ii) The mating face of the LP5 turbine intrascope access blanking plug (72-52-21, 02-180). (iii) The mating face of the LP turbine outer case (72-52-21, 01-060). (n) Put the LP5 turbine intrascope access blanking plug (72-52-21, 02-180) in the LP turbine outer case (72-52-21, 01-060). (o) Torque the LP5 turbine intrascope access blanking plug (72-52-21, 02-180) to 26 Nm (230 lbfin). (12) Accomplishment of this Non-Modification Service Bulletin should be recorded in the engine logbook.**Printed in Great Britain**



# RB.211−72−AH054 Page 11 Sep.14/12 Sep.14/12deh0013135 WASHER 01−330 TO

01−338 (As required) BOLT 01−352 (50 off) NUT 01−360 (50 off)

LP TURBINE STAGE 1 DISK 01−300 LP TURBINE STAGE 3 DISK 01−470 NUT 01−478 (84 off) BOLT 01−472 (84 off)

LP TURBINE STAGE 2 DISK 01−350 NUT 01−658 (110 off) BOLT 01−652 (110 off) BOLT 01−802 (60 off) NUT 01−808 (60 off)

WASHER 01−810 TO

01−818 (As required)

LP TURBINE STAGE 4 DISK 01−650 LP TURBINE STAGE 5 DISK 01−800

**NOTE:** All IPC Fig/Item numbers are 72−52−31 unless identified differently INSPECTION AREA 1 INSPECTION AREA 2 INSPECTION AREA 3 INSPECTION AREA 4

Inspection Areas Fig.1**Printed in Great Britain**



# RB.211−72−AH054 Page 12 Sep.14/12 Sep.14/12Stage 2 Inter Stage Seal (ISS) and Stage 2 Disc Seal Fin Fig.2**Printed in Great Britain**



# RB.211−72−AH054 Page 13 Sep.14/12 Sep.14/12Stage 3 Inter Stage Seal (ISS) and Stage 2 Disc Seal Fin Fig.3**Printed in Great Britain**



# RB.211−72−AH054 Page 14 Sep.14/12 Sep.14/12Stage 4 Inter Stage Seal (ISS) and Stage 4 Disc Seal Fin Fig.4**Printed in Great Britain**



# RB.211−72−AH054 Page 15 Sep.14/12 Sep.14/12Stage 5 Inter Stage Seal (ISS) and Stage 4 Disc Seal Fin Fig.5**Printed in Great Britain**



# RB.211−72−AH054 Page 16 Sep.14/12 Sep.14/12This 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 72-AH054 Overhaul Base

Operator
Engine Mark
Date of Inspection
Engine Serial Number
Engine Hours Since New
Engine Cycles Since New

08 Module Part Number

08 Module Serial Number

08 Module Hours Since New
08 Module Cycles Since New Intrascope Inspection Results(accept/reject)/comments Stage 2
Stage 3
Stage 4
Stage 5 APPENDIX 1**Printed in Great Britain**



# RB.211−72−AH054 Appendix 1 - Page 1 of 1 Sep.14/12 Sep.14/12