TRANSMITTAL SHEET

CFM INTERNATIONAL

CFM56-7B SERVICE BULLETIN 72-0964, REVISION 1

OLD TITLE

Subject: ENGINE - Accessory Gearbox (72-63-00) - AGB/TGB Master Chip Detector (MCD) Inspection

for CFM56-7B

NEW TITLE

Subject: ENGINE - Accessory Gearbox (72-63-00) - AGB/TGB Magnetic Chip Detector (MCD) Inspection

for CFM56-7B

DECEMBER 15, 2014

This page transmits Revision 1 to CFM56-7B Service Bulletin 72-0964 dated October 24, 2014.

Previous revision 0 of this Service Bulletin has never been published.

This Service Bulletin has been revised to update inspection intervals and instructions.

Consequently, the following paragraphs has been updated:

– 1.A. Effectivity, 1.B. Description, 1.E. Reason 1.G. Manpower, to correct MCD acronym.

– 1.C. Compliance, 3. ACCOMPLISHMENT INSTRUCTIONS, to update inspection intervals and

instructions.

Engines that have previously complied with this Service Bulletin are not affected.

The vertical dash in the left-hand margin indicates change. A change, which does not affect the technical

content, may not be highlighted in the Transmittal Sheet.

This Service Bulletin is reissued in its entirety.

ENGINE - Accessory Gearbox (72-63-00) - AGB/TGB Magnetic Chip Detector (MCD) Inspection for

CFM56-7B

CFM PROPRIETARY INFORMATION

The information contained in this document is CFM proprietary information and is disclosed in

confidence. It is the property of CFM and shall not be used, disclosed to others or reproduced

without the express written consent of CFM, including, but without limitation, it is not to be used in

the creation, manufacture, development, or derivation of any repairs, modifications, spare parts,

design, or configuration changes or to obtain FAA or any other government or regulatory approval

to do so. If consent is given for reproduction in whole or in part, this notice and the notice set

forth on each page of this document shall appear in any such reproduction in whole or in part.

The information contained in this document may also be controlled by U.S. export control laws.

Unauthorized export or re-export is prohibited.

All technical documentation and information contained herein, with respect to assembly and

disassembly, cleaning, inspection methods and limits, repair methods and limits, operational

limits, life limits and the like, have been developed and approved for use with engines and parts

that have been manufactured and/or approved by CFM and that have been maintained in

accordance with CFM technical documentation and recommendations. CFM has no contractual

or legal obligation for, nor knowledge of, non-CFM-approved parts and repairs. Accordingly, this

document is not intended to apply to non-CFM-approved parts and repairs.

CFM56-7B S/B 72-0964

December 15, 2014 PAGE 1 of 15
ENGINE - Accessory Gearbox (72-63-00) - AGB/TGB Magnetic Chip Detector (MCD) Inspection for

CFM56-7B

1. PLANNING INFORMATION

A. Effectivity

CFM56-7B20, -7B20/3, -7B20/2, -7B20E

CFM56-7B22, -7B22/B1, -7B22/3, -7B22/3B1, -7B22/2, -7B22E, -7B22E/B1

CFM56-7B24, -7B24/B1, -7B24/3, -7B24/3B1, -7B24/2, -7B24E, -7B24E/B1

CFM56-7B26, -7B26/B1, -7B26/B2, -7B26/3, -7B26/3B1, -7B26/3B2, -7B26/3F, -7B26/3B2F,

-7B26/2, -7B26E, -7B26E/B1, -7B26E/B2, -7B26E/F, -7B26E/B2F

CFM56-7B27, -7B27/B1, -7B27/B3, -7B27/3, -7B27/3B1, -7B27/3B3, -7B27/3F, -7B27/3B1F,

-7B27/2, -7B27E, -7B27E/B1, -7B27E/B3, -7B27E/F, -7B27E/B1F

(1) The Accessory Gearbox Assembly (AGB) 340-046-509-0, the 73 tooth gearshaft

335-302-902-0 (fuel pump line 6) and the 41 tooth gearshaft 335-303-002-0

(intermediate line 7) installed on CFM56-7B engines or stored as spares are affected.

(2) The Magnetic Chip Detector (MCD) Inspection concerns the engine serial numbers

listed in Appendix A and the gearshafts delivered as spares in Appendix B.

B. Description

This Service Bulletin recommends AGB/TGB Magnetic Chip Detector (MCD) Inspection and

particles lab analysis of a defined serial number population range of 73 tooth gearshafts

(fuel pump line 6) and of a defined serial number population range of 41 tooth gearshafts

(intermediate line 7).

C. Compliance

Category 2

Do as soon as possible without effect on revenue service but before specified intervals.

For all Engines listed in Appendix A or in Appendix B, where

affected AGB S/N AND affected 73 tooth gearshaft remain installed,

OR

affected AGB S/N AND affected 41 tooth gearshaft remain installed,

CFM56-7B S/B 72-0964

December 15, 2014 PAGE 2
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CFM56-7B

AND

that have accumulated more than 3000FH, if line 6 only is affected,

OR

that have accumulated more than 3000FH, if Line 6 and line 7 are affected,

OR

that have accumulated more than 6000FH if line 7 only is affected,

Perform MCD inspection and particles collection 250 hours from last inspection or as soon

as possible if AGB/TGB MCD inspection was done more than 250 hours ago. Repeat

every 500 FH including lab assessment.

NOTE 1: This Service Bulletin can be accomplished on wing.

NOTE 2: This accomplishment does not replace the dispositions existing in AMM for

MCD findings.

D. Concurrent Requirements

None.

E. Reason

(1) Objective:

To do an inspection

(2) Condition:

CFM has identified 73 tooth gearshafts and 41 tooth gearshafts that exhibit premature

wear on teeth, that can cause In-Flight Shutdown events (IFSD).

(3) Cause:

Investigation has identified a population of AGB equipped with 73 tooth gearshaft or

with of 41 tooth gearshafts suspected to exhibit premature wear

(4) Improvement:

Improve the reliability by doing AGB/TGB Magnetic Chip Detector (MCD) Inspection

on a defined population of AGB.

CFM56-7B S/B 72-0964

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(5) Substantiation:

Substantiation is by analysis.

F. Approval

The technical content of this document is approved by the FAA and under the authority of

DOA n° EASA.21J.086.

G. Manpower

You will need approximately 1 man-hour for each engine for the Inspection AGB/TGB

Magnetic Chip Detector (MCD) Inspection.

H. Weight and Balance

Weight and balance are not changed.

CFM56-7B S/B 72-0964

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ENGINE - Accessory Gearbox (72-63-00) - AGB/TGB Magnetic Chip Detector (MCD) Inspection for

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I. References

Boeing 737-600/700/800/900 Aircraft Maintenance Manual

J. Publications Affected

None.

K. Interchangeability

None

L. Software Accomplishment Summary

None.

2. MATERIAL INFORMATION

A. Material - Price and Availability

(1) Parts necessary to do this Service Bulletin:

None

(2) Other Spare Parts:

None

B. Industry Support Information

CFM will support free of charge lab analysis at the specified laboratories.

C. Disposition of Parts

None

D. Tooling - Price and Availability

None

3. ACCOMPLISHMENT INSTRUCTIONS

For All Engines described in 1.C. Compliance,

A. on wing

CFM56-7B S/B 72-0964

December 15, 2014 PAGE 5
ENGINE - Accessory Gearbox (72-63-00) - AGB/TGB Magnetic Chip Detector (MCD) Inspection for

CFM56-7B

(1) Perform AMM TASK 79-00-00-200-804-F00 Chip Detectors and Scavenge Screens

Inspection for AGB/TGB. If AGB/TGB is serviceable and magnetic particles are seen,

Photograph MCD to document condition and collect particles for lab analysis.

(2) Complete the record form in Appendix C for each MCD inspection.

(3) Send collected magnetic particles for lab investigation to one of the sources listed

below:

Spectro

Hatchwood Place

Farnham Road

Odiham

Hampshire RG291AB

United Kingdom

Phone: +44-1256-704000

Fax: +44-1256-704006

AOG:+44-1256-393500

Jet-Care International, Inc

3 Saddle Road

Cedar Knolls, NJ 07927

U.S.A.

Phone: +1-973-292 9597

Fax: +1-973-292 3030

AOG: Switchboard as above

NOTE 1: Gearshaft material is 16NCD13.

NOTE 2: CFM chose these labs to comply with requirements in particles size and

count for which CFM required to give disposition. Should customers

want to use another lab, please approach CFM with any other Lab

results for CFM validation.

(4) If any size magnetic particles, including fuzz are seen, send form in Appendix C with

inspection results, lab analysis and picture of MCD to CFM for disposition.

Per AMM TASK 79-00-00-200-804-F00, Continue Inservice allowance of 50-75

hours is provided.

Upon receipt of lab analysis, CFM shall, within 24 hours, notify affected operator with

specific maintenance action to supplement AMM disposition.

CFM56-7B S/B 72-0964

December 15, 2014 PAGE 6
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CFM56-7B

Europe, Middle East, and Africa

RegionCustomers CFM International SA

Customers

North and South America and

AsiaCustomers CFM International

Inc. Customers

CFM International SA

Customer Support Operation

Attn: CFM AGB/TGB Product Engineer -

Alex Bernardet

c/o Snecma -Site de Melun-Montereau

Aerodrome de Villaroche

BP 1936-77019 Melun Cedex

FRANCE

Email: alex.bernardet@snecma.fr

Phone: +33-(0)-1-64-14-85-44

Fax: +33-(0)-1-64-14-8765

CFM International Inc.

Attn: CFM Bearing Product Engineer -

Jason Fritz

One Neumann Way-Room 444

Cincinnati, OH 45215-1988 USA

U.S.A.

Email: jason.fritz@ge.com

Phone: +1-513-552-2894

Fax: +1-513-552-5081

CFM56-7B S/B 72-0964

December 15, 2014 PAGE 7
ENGINE - Accessory Gearbox (72-63-00) - AGB/TGB Magnetic Chip Detector (MCD) Inspection for

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4. A - APPENDIX A

List of engines with 73 tooth gearshaft 335-302-902-0 (fuel pump line 6) and 41 tooth gearshaft

335-303-002-0 (intermediate line 7) installed in production on AGB.

ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

657220 WZ9871 EB960712 658235 WZ9558 EB960580 EE049365

657243 WZ9876 EB960726 658236 WZ9872 EB960704

657258 WZ9858 EB374569 658237 WZ9878 EB960722

657292 WZ9359 EB364108 EE020531 658238 WZ9873 EB960715

657302 WZ9884 EB960727 658240 WZ9874 EB960705

657310 WZ9937 EB355507 658241 WZ9875 EB960721

657318 WZ9942 EB398629 658245 WZ9877 EB960719

657323 WZ9938 EB960681 658247 WZ9883 EB960720

657341 WZ9941 EB960703 658251 WZ9881 EB960708

657346 WZ9936 EB355478 658253 WZ9879 EB960718

657385 WZ9935 EB325274 658256 WZ9880 EB960709

657571 WX1112 EB355427 658257 WZ9882 EB504487

658117 WZ9582 EB960627 658261 WZ9885 EB960710

658129 WZ9588 EB960628 658262 WZ9868 EB960571

658133 WZ9580 EB374607 658270 WZ9344 EB960603 EE049344

658190 WZ9863 EB398574 658275 WZ9835 EB960706

658191 WZ9867 EB374583 658279 WZ9831 EB374567

658195 WZ9864 EB960576 658282 WZ9837 EB960713

658210 WZ9861 EB364104 658290 WZ9862 EB398568

658217 WZ9860 EB960575 658291 WZ9839 EB355425

658218 WZ9857 EB355449 658293 WZ9834 EB960570

658222 WZ9870 EB960716 658306 WZ9411 EB325356

658226 WZ9859 EB960577 658308 WZ9836 EB960707

658227 WZ9865 EB374576 658312 WZ9939 EB960637

658230 WZ9869 EB960574 658313 WZ9891 EB960728

658233 WZ9866 EB960572 658316 WZ9838 EB960711

CFM56-7B S/B 72-0964

December 15, 2014 PAGE 8
ENGINE - Accessory Gearbox (72-63-00) - AGB/TGB Magnetic Chip Detector (MCD) Inspection for

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ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

658317 WZ9833 EB960579 962633 WZ9378 EB355487

658326 WZ9402 EB960616 EE020515 962634 WZ9376 EB325341

658332 WZ9832 EB960573 962636 WZ9370 EB325328

658335 WZ9890 EB960723 962637 WZ9374 EB374572

658339 WZ9840 EB960724 962638 WZ9252 EB374575

658342 WZ9892 EB960717 962639 WZ9379 EB325330

658348 WZ9940 EB960701 962640 WZ9368 EB364105

658351 WZ9841 EB960725 962642 WZ9357 EB374602 EE020530

658390 WZ9970 EB960672 962644 WZ9250 EB374579

658395 WZ9969 EB374574 962645 WZ9387 EB960653

658397 WZ9968 EB960700 962648 WZ9389 EB960649

658398 WZ9971 EB398636 962649 WZ9392 EB960696

658418 WZ9966 EB960702 962650 WZ9390 EB960659

658500 WZ9973 EB504519 962651 WZ9384 EB374592

658529 WX1114 EB355439 962652 WZ9395 EB960695

658656 WX1111 EB364107 962653 WZ9396 EB960691 EE020528

962609 WZ9358 EB364109 EE020513 962654 WZ9398 EB960673 EE020517

962610 WZ9361 EB325343 EE020512 962656 WZ9393 EB960697

962611 WZ9363 EB364101 EE020524 962657 WZ9400 EB960677 EE020521

962612 WZ9356 EB374582 EE020520 962658 WZ9394 EB960610

962617 WZ9251 EB364092 962661 WZ9381 EB325316

962618 WZ9364 EB364098 962662 WZ9249 EB504509 EB979610

962623 WZ9365 EB355479 962663 WZ9290 EB960693 EE020514

962624 WZ9355 EB325321 EE020525 962664 WZ9291 EB960671 EE020511

962625 WZ9375 EB374566 962665 WZ9391 EB960664

962627 WZ9373 EB364090 962666 WZ9423 EB960665

962628 WZ9367 EB364096 962667 WZ9397 EB364100 EE020519

962629 WZ9366 EB364102 962670 WZ9425 EB960613

962631 WZ9369 EB364089 962671 WZ9420 EB960644

962632 WZ9377 EB374568 962672 WZ9415 EB960675

CFM56-7B S/B 72-0964

December 15, 2014 PAGE 9
ENGINE - Accessory Gearbox (72-63-00) - AGB/TGB Magnetic Chip Detector (MCD) Inspection for

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ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

962674 WZ9422 EB960646 962842 WZ9351 EB960583 EE049345

962675 WZ9403 EB960622 EE020509 962847 WZ9562 EB960688 EE049367

962676 WZ9399 EB960678 EE020504 962851 WZ9555 EB960599 EE049386

962679 WZ9409 EB960642 962854 WZ9545 EB960606

962682 WZ9293 EB960676 EE020508 962858 WZ9559 EB960604 EE049346

962684 WZ9421 EB960643 962859 WZ9561 EB960594 EE049366

962687 WZ9419 EB960648 962861 WZ9553 EB960683 EE049384

962691 WZ9418 EB960647 962863 WZ9549 EB960605 EE049342

962695 WZ9412 EB960679 962867 WZ9550 EB960598 EE049373

962699 WZ9401 EB960615 EE020507 962871 WZ9568 EB960667 EE049353

962722 WZ9297 EB960661 962872 WZ9551 EB960601 EE049374

962737 WZ9416 EB960680 962881 WZ9566 EB960656 EE049359

962738 WZ9424 EB960652 962888 WZ9563 EB960668 EE049370

962750 WZ9404 EB960690 EE020516 962889 WZ9565 EB960645 EE049347

962764 WZ9341 EB960698 EE049348 962898 WZ9564 EB960624 EE049380

962772 WZ9410 EB325354 962901 WZ9567 EB960650 EE049351

962782 WZ9332 EB960641 EE049155 962919 WZ9590 EB960632

962787 WZ9340 EB960663 EE049343 962939 WZ9583 EB960633

962788 WZ9338 EB960669 EE049363 962951 WZ9586 EB960636

962790 WZ9342 EB960655 EE049358 962952 WZ9587 EB960639

962793 WZ9339 EB960699 EE049356 962955 WZ9589 EB960638

962795 WZ9343 EB960620 EE049368 962968 WZ9592 EB960626

962807 WZ9347 EB960609 EE049381 962969 WZ9556 EB960590 EE049369

962808 WZ9350 EB960589 EE049357 962990 WZ9581 EB960625

962815 WZ9349 EB960600 EE049349 962994 WZ9591 EB960630

962821 WZ9348 EB960595 EE049350 962996 WZ9584 EB960629

962828 WZ9557 EB960587 EE049377 963620 WZ9362 EB325333 EE020503

962831 WZ9548 EB960607 EE049364 963626 WZ9360 EB325327 EE020526

962834 WZ9547 EB960582 EE049355 963646 WZ9371 EB325346

962835 WZ9554 EB960593 EE049362 963647 WZ9383 EB325323

CFM56-7B S/B 72-0964

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ENGINE - Accessory Gearbox (72-63-00) - AGB/TGB Magnetic Chip Detector (MCD) Inspection for

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ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

963659 WZ9388 EB960640 658734 WX1323 EE049157

963660 WZ9385 EB325342 658741 WX1321 EE049335

963668 WZ9372 EB325344 658743 WX1318 EE049150

963669 WZ9382 EB355488 658746 WX1328 EE049339

963677 WZ9292 EB960682 EE020506 658765 WX1322 EE049156

963678 WZ9253 EB325259 658772 WX1325 EE049330

963685 WZ9380 EB325326 658799 WX1329 EE049385

963686 WZ9386 EB960618 962568 WZ9277 EB910875

963690 WZ9408 EB960611 962570 WZ9314 EB979604

963703 WZ9406 EB960689 962573 WZ9309 EB979611

963730 WZ9407 EB960621 962575 WZ9240 EB910873

963735 WZ9417 EB960674 962576 WZ9239 EB979619

963823 WZ9345 EB960588 EE049352 962577 WZ9313 EB979602

963826 WZ9552 EB960596 EE049382 962578 WZ9310 EB979624

963832 WZ9546 EB960586 EE049354 962583 WZ9288 EB979603

963852 WZ9569 EB960686 EE049379 962584 WZ9324 EB979613

963853 WZ9346 EB960581 EE049372 962589 WZ9282 EB910876

963933 WZ9585 EB960634 962590 WZ9323 EB979622

657719 WX1372 EE049338 962591 WZ9289 EB979605

657724 WX1371 EE049333 962592 WZ9281 EB864699

657737 WX1319 EE049337 962594 WZ9287 EB979600

657756 WX1324 EE049158 962595 WZ9327 EE020510

657757 WX1330 EE049332 962596 WZ9325 EB979618

657768 WX1327 EE049331 962597 WZ9286 EB979621

657779 WX1326 EE049341 962598 WZ9246 EB979625

658527 WZ9459 EE049149 962599 WZ9284 EB910881

658677 WX1370 EE049336 962602 WZ9280 EB910878

658691 WX1373 EE049334 962603 WZ9326 EE020518

658699 WX1374 EE049383 962604 WZ9320 EB979606

658733 WX1320 EE049340 962605 WZ9245 EB910880

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ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

962606 WZ9318 EB979620 962721 WZ9450 EE049138

962607 WZ9322 EB979612 962723 WZ9471 EE049144

962608 WZ9321 EB979615 962724 WZ9300 EE020597

962613 WZ9315 EB979614 962725 WZ9447 EB979637

962614 WZ9317 EB979608 962726 WZ9301 EE049143

962615 WZ9316 EB979617 962727 WZ9463 EE049133

962621 WZ9243 EE020529 962731 WZ9454 EE020594

962622 WZ9328 EE020527 962732 WZ9448 EE020596

962630 WZ9247 EB979607 962733 WZ9336 EE049124

962635 WZ9241 EB910877 962734 WZ9440 EE049136

962641 WZ9329 EE020502 962740 WZ9442 EE049120

962643 WZ9248 EB979626 962741 WZ9475 EB979634

962655 WZ9306 EB864700 962742 WZ9457 EB979631

962683 WZ9437 EE049152 962746 WZ9468 EE049125

962689 WZ9446 EE049141 962751 WZ9460 EE049134

962692 WZ9449 EE020599 962756 WZ9456 EE049154

962693 WZ9436 EE049142 962757 WZ9470 EE049117

962694 WZ9452 EE020600 962761 WZ9480 EE049147

962696 WZ9451 EE049145 962762 WZ9481 EE049121

962701 WZ9453 EE049118 962765 WZ9469 EE049148

962702 WZ9461 EB979628 962766 WZ9472 EB979633

962704 WZ9455 EB979632 962775 WZ9483 EE020590

962705 WZ9458 EE049122 962776 WZ9482 EE049135

962708 WZ9462 EE020598 962777 WZ9477 EE049140

962709 WZ9465 EE049126 962778 WZ9478 EB979635

962710 WZ9302 EE049139 962779 WZ9479 EE049127

962713 WZ9439 EE020591 962780 WZ9335 EE049119

962714 WZ9464 EB979636 962781 WZ9337 EE049131

962717 WZ9473 EE049137 962806 WZ9334 EE049132

962719 WZ9474 EE049130 962812 WZ9333 EE049129

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ESN S/N AGB S/N 73 tooth

gearshaft

S/N

41 tooth

gearshaft

S/N

962918 WZ9573 EE049371

962986 WZ9572 EE049378

963544 WZ9278 EB910879

963551 WZ9276 EB864696

963552 WZ9275 EB864695

963555 WZ9279 EB864702

963556 WZ9283 EB910882

963564 WZ9308 EB979599

963572 WZ9311 EB979616

963587 WZ9312 EB979623

963588 WZ9319 EB979627

963600 WZ9285 EB979601

963616 WZ9242 EB864698

963697 WZ9438 EE020595

963736 WZ9467 EE049128

963747 WZ9304 EE049123

963748 WZ9303 EE049151

963753 WZ9466 EE020592

963754 WZ9476 EB979629

963785 WZ9485 EE020593

963786 WZ9484 EB979630

963845 WZ9571 EE049360

963848 WZ9570 EE049375

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5. B - APPENDIX B

List of 73 tooth gearshafts 335-302-902-0 delivered as spares.

AGB S/N 73 tooth

gearshaft S/N

41 tooth

gearshaft S/N

WZ9405 EB960685 -

- EB960617 -

- EB960619 -

- EB960654 -

- EB960666 -

CFM56-7B S/B 72-0964

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6. C - APPENDIX C

MCD Inspection Record - CFM56-7B S/B 72-0964

MCD Inspection Date:

Customer:

Customer Contact Information (to return Email

MCD inspection analysis results): Phone

Engine Serial Number

Aircraft Registration Number

Engine Position Number

Gearshaft Time Since New

Gearshaft Cycle Since New

CFM56-7B S/B 72-0964

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