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 2
1. 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.14/12
Inspection 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

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Sep.14/12
2. 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.14/12
3. 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.14/12
2 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

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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

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Page 6

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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

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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

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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.14/12
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 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

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Sep.14/12
deh0013135

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.14/12
Stage 2 Inter Stage Seal (ISS) and Stage 2 Disc Seal Fin

Fig.2

Printed in Great Britain

RB.211−72−AH054

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Sep.14/12
Stage 3 Inter Stage Seal (ISS) and Stage 2 Disc Seal Fin

Fig.3

Printed in Great Britain

RB.211−72−AH054

Page 14

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Sep.14/12
Stage 4 Inter Stage Seal (ISS) and Stage 4 Disc Seal Fin

Fig.4

Printed in Great Britain

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Sep.14/12
Stage 5 Inter Stage Seal (ISS) and Stage 4 Disc Seal Fin

Fig.5

Printed in Great Britain

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Sep.14/12
This 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