P.O. Box 31, DERBY 

DE24 8BJ, UK 

Telephone: 44 (0) 1332 242424 

Fax: 44 (0) 1332 249936 m 

Rol Is-Royce 

The technical information contained in this document has been approved under the authority 

of - See Planning Information, Approval. 

Signed Date Jul. 7/11 

N. J. Wright 

RB211 TRENT 700 AND TRENT 800 SERIES PROPULSION SYSTEMS NON-MODIFICATION 

SERVICE BULLETIN 

ALERT 

This document transmits Revision 2 to Service Bulletin RB211-72-AGO85 

Document History 

Service Bulletin Revision Status 

Initial Issue Jun. 2/09 

Revision 1 Sep. 27/10 

Bulletin Revision 2 

Remove 

All pages of the 

Service Bulletin 

All pages of 

Appendix 1 

Supplement Revision Status 

Incorporate 

Pages 1 to 26 of the 

Service Bulletin 

Page 1 and 2 of 

Appendix 1 

ALERT 

Reason for change 

To amend visual inspection 

acceptance criteria and 

move Accomplishment 

Instructions (3.B.) to 

(3.C.). To amend Fig.1 and 

Appendix 1 Table 1 

To amend visual inspection 

acceptance criteria and 

move Accomplishment 

Instructions (3.B.) to 

(3.C.). To amend Fig.1 and 

Appendix 1 Table 1 

Transmittal - Page 1 of 3 

CHECK THAT ALL PREVIOUS TRANSMllTALS HAVE BEEN INCORPORATED 

If any have not been received please advise Customer Data Services, Rolls-Royce plc, Derby, England 

O Rolls-Royce plc (date as above) Printed in Great Britain 
All pages of

Appendix 2

Page 1 and 2 of

Appendix 2

To amend visual inspection

acceptance criteria and

move Accomplishment

Instructions (3.B.) to

(3.C.). To amend Fig.1 and

Appendix 1 Table 1

Printed in Great Britain

RB.211−72−AG085

Transmittal - Page 2
LIST OF EFFECTIVE PAGES

The effective pages to this Service Bulletin following incorporation of Revision

2 are as follows:

Page Revision Number Revision Date

Bulletin

R 1 2 Jul.7/11

R 2 2 Jul.7/11

R 3 2 Jul.7/11

R 4 2 Jul.7/11

R 5 2 Jul.7/11

R 6 2 Jul.7/11

R 7 2 Jul.7/11

R 8 2 Jul.7/11

R 9 2 Jul.7/11

R 10 2 Jul.7/11

R 11 2 Jul.7/11

R 12 2 Jul.7/11

R 13 2 Jul.7/11

R 14 2 Jul.7/11

R 15 2 Jul.7/11

R 16 2 Jul.7/11

R 17 2 Jul.7/11

R 18 2 Jul.7/11

R 19 2 Jul.7/11

R 20 2 Jul.7/11

R 21 2 Jul.7/11

R 22 2 Jul.7/11

R 23 2 Jul.7/11

R 24 2 Jul.7/11

R 25 2 Jul.7/11

R 26 2 Jul.7/11

Appendix 1

R 1 2 Jul.7/11

R 2 2 Jul.7/11

Appendix 2

R 1 2 Jul.7/11

R 2 2 Jul.7/11

Printed in Great Britain

RB.211−72−AG085

Transmittal - Page 3
1. Planning Information

A. Effectivity

(1) Boeing 777

Trent 800 Engines - All marks.

(2) Airbus A330

Trent 700 Engines - All marks.

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.

In response to the first finding on the Trent 800 Non-Modification Service

Bulletin (NMSB) 72-AF260 (see References (1.H.)) was raised to specify

in-shop visual inspection of the rear balance land for the Trent 500,

Trent 700 and Trent 800 engine fleets. In addition NMSB 72-AF313 (see

References (1.H.)) has been raised to specify on-wing borescope inspection

of the balance land on Trent 800 engines.

Initial Issue of NMSB 72-AG085 was raised to specify an enhanced crack

detection technique, Eddy Current Inspection, for the rear balance land.

This was to be done in-shop on Trent 700 and Trent 800 engines.

R a procedure to determine if an Revision 1 of this NMSB incorporated

R spurious or genuine. indication was

(2) revision 2 of this NMSB is issued to revise the visual inspection

acceptance criteria and also note that the NMSB is subject to an EASA

Airworthiness Directive (AD).

R

R

R

(3) Substantiation

This NMSB instructs an Eddy Current inspection of the IP Compressor Shaft

rear balance land.

(4) Objective

Incorporation of this NMSB is to maintain reliability and obtains data to

support engineering analysis.

ENGINE - IP COMPRESSOR SHAFT EDDY CURRENT INSPECTION OF BALANCE LAND - NON

MODIFICATION SERVICE BULLETIN - NON - MOD.72-AG085

Printed in Great Britain

RB.211−72−AG085

Page 1 of 30

Jun. 2/09

R Jul. 7/11
(5) Effect of Bulletin on:

(a) Operation

Not affected.

(b) Maintenance

Not affected.

(c) Overhaul

Affected (see 3. Accomplishment Instructions).

(d) Repair Schemes

Not affected.

(e) Interchangeability

Not affected.

C. Compliance

ALERT

This Service Bulletin should be accomplished at shop visit, on all engines

sufficiently disassembled to access the Intermediate Pressure (IP) compressor

module rear face.

This NMSB need not be accomplished on IP compressor shafts that have a life of

zero cycles since new.

R to EASA AD 2010-0266. This NMSB is subject

D. Approval

The technical content of this Non-Modification Service Bulletin was approved

under the authority of Design Organisation Approval EASA.21J.035 on Jun. 1/09,

re-approved on Sep.24/10

R

R and on Jul. 5/11.

E. Manpower

(1) Time to remove the balance weights

0.25 manhours.

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R Jul. 7/11
(2) Time to inspect

2.0 manhours.

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.

(3) Time to install the balance weights

0.25 manhours.

F. Material Price and Availability

None.

G. Tooling Price and Availability

PART NUMBER PART NAME USAGE

AMO

FUNCTION

OMat 256 Teflon Tape *** Adhesive tape

OMat 261 Temporary Marker *** Pencil/Crayon

HU82284 Eddy Current

Inspection Kit

*** Containing

carriage, working

standard and probe

Usage column abbreviation

A - accomplish

M - maintenance

O - overhaul

H. References

Rolls-Royce RB211 ALERT Non-Modification Service Bulletin

(1) 72-AF260

Engine - IP compressor shaft - Visual inspection of balance land -

Non-Modification Service Bulletin

(2) 72-AF313

Engine - IP compressor shaft - Visual borescope inspection of balance land

- Non-Modification Service Bulletin

Printed in Great Britain

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Page 3

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R Jul. 7/11
2. 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

-- -

01452 AS44691 AR WASHER, VU1653 - - -

NOTE: Quantity As Required (AR) up to a maximum of 4.

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3. Accomplishment instructions

CAUTION: YOU MUST ALWAYS WEAR COTTON GLOVES WHEN YOU TOUCH THE SHAFT.

CAUTION: TAKE CARE TO CORRECTLY RECORD WHICH BALANCE WEIGHT AND CLAMP WERE

REMOVED FROM WHICH POSITION. THE POSITION OF THE BALANCE WEIGHT SHOULD

BE MARKED ON AN AREA THAT IS NOT THE SUBJECT OF THE INSPECTION. THE

BALANCE WEIGHT AND CLAMP HAVE TO BE FITTED BACK IN EXACTLY THE SAME

POSITION THAT THEY WERE REMOVED FROM.

NOTE: Keep all of the balance weights, clamp plates, washers and bolts if at

any stage of the inspection the acceptance criteria are not met.

A. Remove balance weight assemblies.

(1) Use an OMat 261 temporary marker to show the position of each balance

weight.

(2) Record the size and position of the balance weights on the attached

inspection sheet, see Appendix 1.

(3) Remove the balance weight assemblies (balance weight, clamp, washer and

bolt) from the balance land and retain these components.

(4) Clean the areas to be inspected using a dry cloth.

NOTE: Take care not to erase the temporary markings that show the

position of the balance weights.

B. Eddy current inspection of the balance land.

(1) Equipment requirements.

(a) Phase Display Eddy Current Instrument and probe connecting cable.

Rohmann Elotest B1 or equivalent.

(b) OMat 256 - Teflon Tape

NOTE: The following tooling has been specially developed for the

inspection and alternative tooling is not to be used.

(c) The following probe carriage and working standard are available from

Rolls-Royce as a Kit HU82284 having the following parts:

(i) Working standard HU82285 (Ti6/4)

(ii) Probe carriage comprising the following parts:

Universal carriage UCBL-1

Horizontal sensor slide for

face scans

SSBL-B

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Chamfer sensor slide for

chamfer scans

SSBL-A

Vertical sensor slide for

outside diameter scans

SSBL-C

Eddy current probe MDK-1 H-1803.02.1

Spare O ring tyres. The O ring dimensions are inside dia 7 mm

x 1 mm. Suitable O rings are available from Rohmann, Part No.

OR7X1NI70

(d) An applicable probe to instrument connecting cable is required. For

Elotest instruments the part number is EK-2HF/1 available from

Rohmann. Connecting leads for other instruments are also available

from Rohmann.

(2) Preparation for inspection.

(a) Make sure the disc balance land is in a clean condition to prevent

false indications and that the balance weights are removed.

(b) Identify the Shafts Datum position in accordance with Accomplishment

R Instructions (3.B.(10)).

(c) Switch the Eddy Current instrument on and leave to warm up for 10

minutes or in accordance with the instrument manufacturers

instructions. Switch the display to X-Y.

(d) Position the Teflon tape on the face of the probe (MDK-1 H-1803) as

shown in Fig.6.

(e) Locate the probe assembly alignment dots, one on the probe body and

one on each of the sensor slides.

(f) Install probe MDK-1 H-1803 to face scan horizontal sensor slide

SSBL-B, aligning the dots on the probe body and slide. Install the

assembly to the universal carriage UCBL-1. Refer to Fig.7. Make sure

the locking mechanism is fully engaged. Refer to Fig.8.

(g) Make sure that there are no loose or worn parts on the tooling before

and after use.

(h) Put the fully assembled carriage on the disc and if necessary adjust

the outer wheels of the carriage so that there is not too much

movement in the channel between the dovetail slots and the outer

diameter of the balance land. Make sure the face of the eddy current

probe is flush with the balance land face.

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(3) Initial probe/instrument set-up - necessary for new probe/instrument

combination.

(a) Switch the instrument on and let it warm up for 10 minutes or in

accordance with the instrument manufacturers instructions. Make sure

the probe to instrument cable is connected.

(b) Set the FREQUENCY to 3.0 MHz.

(c) If necessary set the instrument up for a Bridge Reflection probe and

set the optimum instrument conditions.

(d) Set the display spot position to the centre of the screen and the spot

persistence to approx 1.0 seconds

(e) Set the HIGHPASS FILTER Off (0Hz), set the LOWPASS FILTER to 80Hz.

(f) Adjust the Phase Angle and Sensitivity controls to suit the inspection

requirements of individual probes.

(g) Where an Elotest B1 instrument is used, set the Preamp Gain to 12 dB,

Main Gain to 18 dB and Y Axis Spread to 12 dB, giving an overall Gain

of 42 dB. The gain values are estimates for an Elotest B1 instrument,

to make sure the notch signal is not more than Full Screen Height

(FSH). Initially adjust to suit the applicable eddy current instrument

to be used for the inspection to make sure there is a signal response

from the notch to FSH.

(h) Put the carriage on to the working standard HU82285 with the probe

coil set approximately in the centre of the width of the face, away

from the EDM notch. Push down to make sure the carriage wheels touch

fully the base of the working standard and NULL the probe. Lift the

Carriage a small distance from the surface and adjust signal to give a

horizontal spot movement, which will move from left to right as the

eddy current probe lifts from the surface. The Lift-Off signal is now

correctly set.

(i) Make sure the carriage wheels touch fully with the base of the working

standard and move the eddy current probe over the notch in the face of

the working standard. Compress the probe coil spring and apply a

constant load to the coil. The phase angle from the signal response

will be seen to be approximately vertical. Refer to Fig.5.

(j) Find the notch, adjust the Gain (dB) control to move the amplitude

from the notch signal to full screen height. Refer to Fig.5.

(k) Record and keep all the instrument settings on a data card almost the

same as shown in Appendix 2.

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(4) Calibration before inspection.

(a) Set up the instrument, refer to the data card for the eddy current

probe to be used. Make sure all settings have been set up correct. Set

the X-Y display. Make sure the Teflon tape fitted to the face of the

probe is in good condition. If not replace it. Refer to Accomplishment

R Instructions (3.B.(2)(d)).

(b) If necessary, install probe MDK-1 H-1803 to face scan Horizontal

Sensor Slide SSBL-B, aligning the dots on the probe body and slide.

Install the assembly to the Universal Carriage UCBL-1. Refer to Fig.7.

Make sure the locking mechanism is fully engaged. Refer to Fig.8.

(c) Put the probe onto the surface of the working standard HU82285 with

the probe coil set approximately in the centre of the width of the

face, away from the EDM notch. Push down and NULL the probe. Lift the

Carriage a small distance to make sure the signal gives a horizontal

spot movement, which will move from left to right as the eddy current

probe lifts from the surface.

(d) Make sure the carriage wheels touch fully with the base of the working

standard and move the eddy current probe over the notch in the face of

the working standard. The phase angle from the signal result should be

monitored to be approximately vertical and the amplitude result from

the notch signal must be full screen height. Refer to Fig.5.

(e) Do not use the probe if the correct sensitivity cannot be achieved

using the settings recorded before, until the reason for the change

can be given.

(5) Balance land rear face inspection - Horizontal sensor slide SSBL-B.

(a) Set up the instrument, refer to the data card for the probe to be

used. Make sure all items have been set up correct. Set the X-Y

display. Make sure the Teflon tape fitted to the face of the probe is

in good condition. If not replace it. Refer to Accomplishment

R Instructions (3.B.(2)(d)).

(b) Install probe MDK-1 H-1803 to face scan horizontal sensor slide

SSBL-B, aligning the dots on the probe body and slide. Install the

assembly to the universal carriage UCBL-1. Refer to Fig.7. Make sure

the locking mechanism is fully engaged. Refer to Fig.8. Turn the

thumb-wheel to move the index indicator on the probe to the first

index position, near the thumb-wheel, on the Horizontal Sensor Slide

SSLB-B. Make sure the carriage wheel tyres are in good condition.

(c) Identify the Shafts Datum No.1 position. Refer to Accomplishment

R Carefully place the carriage on the balance Instructions (3.B.(11)).

land and push down until the probe tip is flush to the balance land

face. Push the probe tip back through the probe body until the probe

carriage wheels are sitting accurately on the diaphragm face.

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(d) Null the probe. To find out if the probe touches, lift the probe

holder a small distance from the surface, which must show a large

horizontal movement of the spot on the display screen.

(e) Push the carriage to move the probe around the face to do the scan. Be

careful with the areas where the balance weight(s) were removed. Make

sure the full 360 degrees of the balance land is inspected. If the

carriage is moved around the balance land, in one direction, make sure

the cable does not become wound up.

(f) Index the probe to the next increment. This is a half turn of the

thumb-wheel. A click should be felt as the index plunger drops into

position at each half turn. Visually inspect the vernier mark between

the probe body and the index shoe.

R (g) Repeat Accomplishment Instructions 3.B.(5)(e) and (f), nulling the

probe as necessary until all the face is inspected. If an indication

R is seen, refer to Accomplishment Instructions (3.B.(8) and 3.B.(9)).

Record all indications on the form in Appendix 1.

(6) Balance land recess outside diameter inspection - Vertical sensor slide

SSBL-C.

(a) Set up the instrument, refer to the data card for the probe to be

used. Make sure that all items have been set up correct. Set the X-Y

display. Make sure the Teflon tape on the face of the probe holder is

in good condition. If not replace it. Refer to Accomplishment

R instructions (3.B.(2)(d)).

(b) Install probe MDK-1 H-1803 to outside diameter scan vertical sensor

slide SSBL-C, aligning the dots on the probe body and slide. Install

the assembly to the universal carriage UCBL-1. Refer to Fig.8. Make

sure the locking mechanism is fully engaged. Refer to Fig.8. Turn the

thumb-wheel to move the index indicator on the probe to the first

index position, near the thumb-wheel on the Vertical Sensor Slide

SSBL-C. Make sure the support wheel tyres are in good condition.

(c) Identify the Shafts Datum No.1 position. Refer to Accomplishment

R Carefully place the probe carriage on the Instructions (3.B.(11)).

balance land and push down until the probe tip is on the outside

diameter face, take care not to damage the probe tip as it passes over

the outside diameter. Push the probe tip back into the probe body, as

it is put on the outside diameter, until the probe carriage wheels sit

correct on the diaphragm face.

(d) Null the probe. To find out if the probe touches, lift the probe

holder slightly from the surface, which must show a large horizontal

movement of the spot on the display screen.

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(e) Push the probe carriage to move the probe around the outer diameter to

do the scan. Be careful with the areas where the balance weight(s)

were removed. Make sure the full 360 degrees of the balance land is

inspected. If the probe carriage is moved around the outer diameter,

in one direction for each increment, make sure the cable does not

become wound up.

(f) Index the probe to the next increment. This is a half turn of the

thumb wheel. A click should be felt as the index plunger drops into

position at each half turn. Visually inspect the vernier mark between

the probe body and the index shoe.

R (g) Repeat Accomplishment Instructions (3.B.(6)(e) and (f)), nulling the

probe as necessary, until all the face is inspected. If an indication

R is seen, refer to Accomplishment Instructions (3.B.(8) and 3.B.(9)).

Record all indications on the form in Appendix 1.

(7) Balance land chamfer face inspection - Chamfer sensor slide SSBL-A

(a) Set up the instrument, refer to the data card for the probe to be

used. Make sure all items have been set up correct. Set the X-Y

display. Put Teflon tape on the face of the probe holder. Refer to

Fig.6.

(b) Install probe MDK-1 H-1803 to chamfer scan Chamfer Sensor Slide

SSBL-A, aligning the dots on the probe body and slide. Install the

assembly to the Universal Carriage UCBL-1, refer to Fig.9. Make sure

the locking mechanism is fully engaged. Refer to Fig.8. Turn the thumb

wheel to move the index indicator on the probe to the first index

position, near the thumb wheel on the probe shoe. Make sure the

support wheel tyres are in good condition.

(c) Identify the Shafts Datum No 1 position. Refer to Accomplishment

R Carefully place the probe carriage on the Instructions (3.B.(11)).

balance land and push down until the probe tip is flush to the balance

land face. Push the probe tip back through the probe body until the

probe carriage wheels sit correct on the chamfer face.

(d) Null the probe. To find out if the probe touches, lift the probe

holder slightly from the surface which must show a large horizontal

movement of the spot on the display screen.

(e) Push the probe carriage to move the probe around the chamfer to do the

scan. Be careful with the areas where the balance weight(s) were

removed. Make sure the full 360 degrees of the balance land is

inspected. If the probe carriage is moved around the balance land in

one direction, make sure the cable does not become wound up.

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(f) Index the probe to the next increment. This is a half turn of the

thumb-wheel. A click should be felt as the index plunger drops into

position at each half turn. Visually inspect the vernier mark between

the probe body and the index shoe.

R (g) Repeat Accomplishment Instructions 3.B.(7) (e) and (f), nulling the

probe as necessary, until the complete face is inspected. If an

R indication is seen, refer to Accomplishment Instructions (3.B.(8) and

R Record all indications on the form in Appendix 1. 3.B.(9)).

(8) Interpretation of the eddy current instrument CRT screen display.

(a) Defects will show again and again on the X-Y display as a signal

rising in a line from the centre spot, which is between vertical and

30 degrees from the vertical, as the probe passes over the defect. To

confirm an indication is correct, make sure the area is clean and the

signal will show again and again. Refer to Fig.5.

(b) Transient signals can be seen which may look almost the same as

defects. These will not be seen again and again, and can be ignored.

(c) As the probe is moved around the scalloped area of the Balance Land

face, a signal moving in a downward direction, the opposite direction

to a notch signal will be seen and can be ignored in this area. Refer

to Fig.11.

(d) Be careful while the probe is moved around this area as defects can

occur between the scalloped areas. Refer to Fig.12.

(9) Procedure for determining if an indication is spurious or genuine.

R If an indication is found in section 3.B.(5), (6) or (7) and passes the

R then the following procedure must be used inspections in section 3.B.(8)

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) If necessary, install the probe MDK-1H-1803 to the face scan horizonal

sensor slide SSBL-B.

(i) Align the dots on the probe body and slide.

(ii) Install the assembly to the universal carriage UCBL-1. Refer to

Fig.7.

(iii) Make sure the locking mechanism is fully engaged. Refer to

Fig.8.

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(d) Put the probe onto the surface of the working standard HU82285 with

the probe coil set approximately in the centre of the width of the

face, away from the EDM notch.

(e) Push down and null the probe.

(f) Make sure the carriage wheels touch fully with the base of the working

standard HU82285 and move the eddy current probe over the notch in the

face of the working standard HU82285.

(g) Adjust the phase angle so that the notch signal is vertical.

(h) Adjust the gain so that the notch signal is at full screen height.

(i) Inspect the area again on the balance land only where the indication

was found.

(i) If a vertical signal is seen in this area, the indication must

be a genuine crack signal.

(ii) If no vertical signal can be seen in this area, then the

R indication found in section 3.B.(5), (6) or (7) 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.

(10) Acceptance criteria:

R If an indication is identified as a crack signal following steps 3.B.(8)

R the Shaft must be rejected. Do not complete section 3.C. and and 3.B.(9)

perform any dressing repair of damage or frettage marks.

R

R The inspection

results must be recorded on the form in Appendix 1. 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.

(11) Datum position of shaft:

Record all indications from the datum, centre of the IPC stage 8 blade

loading-slot.

R C. Visual inspection of the balance land .

(1) Visually inspect, using a 10x magnifying lens and a torch, along the

circumference of the balance land. Look for damage, frettage or marks in

the zone marked in Fig.1. Also refer to Fig.2 and Fig.3:

R

R

R

(2) Record the condition of the balance land on the attached inspection sheet.

Refer to Appendix 1.

R

R

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R (3) Acceptance Criteria:

Refer to Trent 700 or Trent 800 Engine Manual 72-32-31, Examine the IP

compressor stage 1 to 8 shaft assembly.

R

R

If the 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.

R

R

R

D. Inspect and Re-fit the Balance Weights

(1) Clean the balance weights and clamps in accordance with Engine Manual,

TASK 72-32-31-100-804.

(2) Inspect the clamps in accordance with Engine Manual, SUBTASK

72-32-31-210-015.

(3) Inspect the balance weights for frettage and record the results in

Appendix 1, inspection sheet.

(a) If frettage is found on the balance weight:

(i) Weigh the balance weight assembly (balance weight, clamp,

washer and bolt).

(ii) Keep, but do not install, the original balance weight, clamp

plate, washer and bolt and refer to Rolls-Royce, via your local

representative.

(iii) Install the balance weight assembly. The weight of the new

balance weight assembly (new balance weight, new clamp, new

washer and new bolt) must be within 0,1 g of the original

balance weight assembly.

(iv) Install the new balance weight and the clamp in the same

position as they were removed from. A new washer and a new bolt

are necessary for each balance weight and clamp to be

installed. Torque the bolt to 4 Nm (35 lbfin.). Bend both sets

of locking tabs against the hexagon take care not to damage the

nut. This is to make sure that the washer stays in contact with

the nut if the bolt clamping-load decreases, thus allowing the

key-washer to become loose.

(v) Make sure that all temporary markings produced by

Accomplishment Instructions (3.A.(1)) are removed.

(b) If no frettage is found on the balance weight:

(i) Keep the balance weight so that it can be installed.

(ii) Discard the washer and bolt.

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(iii) Inspect the clamp plate. If it is damaged or bent, keep it but

do not install it, refer to Rolls-Royce, via your local

representative and install a new clamp plate. If it is not

damaged or bent then it can be installed.

(iv) Install the balance weight and the clamp in the same position

they were removed from. A new washer and a new bolt for each

balance weight and clamp are to be installed. Torque the bolt

to 4 Nm (35 lbfin.). Bend both sets of locking tabs against the

hexagon, take care not to damage the nut. This is to make sure

that the washer stays in contact with the nut if the bolt

clamping-load decreases, thus allowing the key-washer to become

loose.

(v) Make sure that all temporary markings produced by

Accomplishment Instructions (3.A.(1)) are removed.

E. Record of Accomplishment

(1) Complete the form in Appendix 1 and send to Rolls-Royce via your local

representative.

(2) Accomplishment of this Non-Modification Service Bulletin is to be recorded

in the engine logbook.

Printed in Great Britain

RB.211−72−AG085

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R

R Inspection Zone

R Fig.1

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The Damage Mark at the Start of the Crack in the First Find

Fig.2

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The Damage Mark at the Start of the Crack in the Second Find

(Note: The land has been bent backwards to reveal crack)

Fig.3

Printed in Great Britain

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HU82285 Working Standard

Fig.4

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Typical Calibration Display

Fig.5

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PTFE Tape Placed on the Eddy Current Probe

Fig.6

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Probe Placed to Inspect Balance Land Face

Fig.7

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Probe Placed to Inspect Outer Diameter

Fig.8

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Probe Placed to Inspect Balance Land Chamfer

Fig.9

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Scallop Area on the Shaft

Fig.10

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Typical Screen Display from Scallop Area

Fig.11

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Screen Display of Notch in Scallop Area

Fig.12

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Appendix 1

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R

R Table 1

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Appendix 2

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def0013583

INSTRUMENT SETTINGS

Frequency

Preamp gain

Mainamp gain

Axis Spread Y

Phase angle

Sensitivity

Filter

LP Filter

MF/HF/LF

HP Filter

Bandwidth

Gates

3.0 MHz

dB

dB

dB

°

100%FSH

80Hz

HF

Static

Test Piece Details:

HU 82285

Instrument Details:

Serial No:

CRT Display

X−Y / Y−T X−Y

QAS:

Report defect indications

to Rolls−Royce Service

Engineering

Probe Details:

Rohmann Pt No: MDK−1 H−1803

Serial No:

Approved By:

Raised By:

Date:

Page 1of 1 Page ( s )

Area Inspected: Trent 700 Trent 800 Stage 1−8 Shaft Balance Land

Issue No: 01 Part No: VARIOUS Matl :Ti 6246 (TJK) Serial No:

Technique No: Title: T700 and T800 IPC Stage 1−8 Shaft

balance land Eddy Current Inspection

NDT DATA CARD

EDDY CURRENT INSPECTION

INSPECTION DETAILS

Form to be completed and retained for each new combination of probe and instrument

Engine: TRENT700

TRENT800

R

R Table 2

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