ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

CFM PROPRIETARY INFORMATION The information contained in this document is CFM proprietary information and is disclosed in con fi dence. 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, modi fi cations, spare parts, design, or con fi guration 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 72-0965 December 16, 2014 PAGE 1 of 12ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

1. P LA N N I N G I N F O R M A T I O N
A. E ff e ct i v i ty 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 engine serial numbers listed in Appendix A and the gearshafts delivered as spares in Appendix B.
B. D e s c r i pt i o n This Service Bulletin provides recommended removal time for a de fi ned serial number population of 73 tooth gearshafts (fuel pump line 6) and a de fi ned serial number population of 41 tooth gearshafts (intermediate line 7). C. C o m p l i a n c e Category 2 Do as soon as possible without effect on revenue service but before end of 2017 OR before the affected 73 tooth gearshaft accumulates 6,000 fl ight hours since new and before the affected 41 tooth gearshaft accumulates 9,000 fl ight hours since new, for all Engines listed in Appendix A or in Appendix B.
N O T E : This Service Bulletin can be accomplished in shop or on wing.

CFM56-7B S/B 72-0965 December 16, 2014 PAGE 2ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

D. C o n c u r re n t R e q u i re m e n t s None.
E. R e a s o n (1) Objective: To improve the reliability (2) Condition: CFM has identi fi ed 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 identi fi ed a population of AGB equipped with 73 tooth gearshaft or with of 41 tooth gearshafts suspected to exhibit premature wear (4) Improvement: Introduction of a recommended removal time to address the engine operational disruptions due to affected 73 tooth and 41 tooth gearshafts (5) Substantiation: Substantiation is by analysis.
F. A p p rova l The technical content of this document is approved by the FAA and under the authority of DOA n° EASA.21J.086. G. M a n p o w e r No additional man-hour is necessary to do this Service Bulletin.
H. We i g h t a n d B a l a n c e Weight and balance are not changed.

CFM56-7B S/B 72-0965 December 16, 2014 PAGE 3ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

I. R e f e re n c e s CFM56 Engine Shop Manual, CFMI-TP.SM.10
J. P u b l i cat i o n s Aff e ct e d
None.
K. I n t e rc h a n g e a b i l i ty None
L. S oftwa re A cc o m p l i s h m e n t S u m m a ry None.
2. M A T E R I A L I N F O R M A T I O N
A. M at e r i a l

- P r i ce a n d Ava i l a b i l i ty (1) Parts necessary to do this Service Bulletin:
P a rt N u m b e r Q ty / E n g P a rt N a m e U n i t $ P r i c e P kg Q ty L e a d Ti m e D ays 335-302-902-0 (1) 73 Tooth Gearshaft Assembly 12480 (1) 5

335-303-002-0 (1) 41 Tooth Gearshaft Assembly 7680 (1) 5

(2) Other Spare Parts:
None
B. I n d u st ry S u p p o rt I n fo r m at i o n Contact your CSM. C. D i s p o s i t i o n of P a rts Part number 335-302-902-0 or 335-303-002-0, removed to accomplish this Service Bulletin may be locally scrapped.

CFM56-7B S/B 72-0965 December 16, 2014 PAGE 4ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

D. T o o l i n g - P r i c e a n d Ava i l a b i l i ty None
3. A C C O M P L I S H M E N T I N S T R U C T I O N S For All Engines described in 1.C. C o m p l i a n ce , N O T E : Marking of the accomplishment of the Service Bulletin in step A.(3) is optional
A. in shop (1) Remove the suspect 73 tooth gearshaft 335-302-902-0and/or 41 tooth gearshaft 335-303-002-0. Refer to ESM Task 72-63-00-040-085-0. (2) Install a serviceable 73 tooth gearshaft 335-302-902-0 and/or 41 tooth gearshaft 335-303-002-0. Refer to ESM TASK 72-63-00-440-055-0 and ESM TASK 72-63-00-440-056-0. (3) Mark the accomplishment of the Service Bulletin Number with "Post SB72-0965" note on the AGB assembly Identi fi cation plate. Refer to the SPM, ATA 70-10-12, Vibro-Peen Marking.
B. on wing (1) Contact CFM for further guidance.

CFM56-7B S/B 72-0965 December 16, 2014 PAGE 5ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

4. A

- A P P E N D I X 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 72-0965 December 16, 2014 PAGE 6ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

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 72-0965 December 16, 2014 PAGE 7ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

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 72-0965 December 16, 2014 PAGE 8ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

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

CFM56-7B S/B 72-0965 December 16, 2014 PAGE 9ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

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

CFM56-7B S/B 72-0965 December 16, 2014 PAGE 10ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

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

CFM56-7B S/B 72-0965 December 16, 2014 PAGE 11ENGINE - Accessory Gearbox (72-63-00) - 73 Tooth Gearshaft and 41 Tooth Gearshaft Management

5. B

- A P P E N D I X 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 72-0965 December 16, 2014 PAGE 12