CFM AGB Hand Cranking Bearing Failure
**** Hidden Message ***** February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2<BR>AGB Hand Cranking Bearing Failure<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3<BR>Background<BR>• Metal particles found during routine AGB/TGB MCD inspection<BR>• 4 cases to date, removed and sent to shop<BR> 888103 with 1758 TSN / 836 CSN<BR> 888149 with 1367 TSN / 793 CSN<BR> 888105 with 2191 TSN / 1549 CSN<BR> 876745 with 1136 TSN / 1086 CSN<BR>• All AGB handcranking gearshaft ball bearings « line #4 » (340-052-602-0)<BR>damaged<BR>• Other -602-0 installed in the AGB’s<BR>– IDG gearshaft ball bearing « line8 »<BR>– No damages found<BR>AGB Hand Cranking Bearing<BR>Ball bearing<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4<BR>Axial cracks Spalling on a 35° sector<BR>Spalling<BR>Spalling on a 55° sector<BR>AGB Hand Cranking Bearing<BR>Failed Part Investigation<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5<BR>Cross Section Plan<BR>Axial crack depth:<BR>0,35 mm = 14 mils<BR>Fatigue crack =Spalling<BR>Coarse martensitic structure<BR>AGB Hand Cranking Bearing<BR>Failed Part Investigation<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 6<BR>Spalling starting from a crack<BR>AGB Hand Cranking Bearing<BR>Failed part Investigation<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 7<BR>Residual stresses measurement<BR>• 2 new bearings<BR>• 1 is in CFM experience<BR>• 1 is out of experience<BR>• high process dispersion<BR>AGB Hand Cranking Bearing<BR>New Part Investigation<BR>Depth(microns)<BR>-500<BR>-400<BR>-300<BR>-200<BR>-100<BR>0<BR>100<BR>200<BR>300<BR>400<BR>0 10 20 30 40 50 60 70<BR>Good compression stress distribution<BR>Tensile stress distribution<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 8<BR>Coarse<BR>microstructures<BR>+<BR>Tensile residual<BR>stresses<BR>Surface fatigue<BR>abnormal Spalling<BR>grinding<BR>AGB Hand Cranking Bearing<BR>Failure Mode Scenario<BR>Root Cause = Surface overheating during grinding operation<BR>Cracks<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 9<BR>Root Cause<BR>• All four (4) failures occurred on bearings coming from a single<BR>batch of grinding operation<BR>• Overheating due to machine tooling shaft abnormal vibrations<BR>Corrective Actions<BR>• Manufacturing tool shaft replaced prior to the next batch<BR>• Others : Smaller batch size, destructive test added in every<BR>batch, ….<BR>AGB Hand Cranking Bearing<BR>Potential Affected Population<BR>Root cause confirmed - Batch identified<BR>Corrective actions implemented<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 10<BR>Batch definition<BR>• The grinding batch includes 361 bearings installed on line #4,<BR>and line #8<BR>• As this bearing (340-052-602-0) is fitted on other CFM56<BR>models, the bearings from that batch have been installed on<BR>80 CFM56-7B engines<BR> 4 line #4 failed in service<BR> 3 engines have the bearing on line #8 only<BR> 73 remaining engines have a bearing from the batch on<BR>the line #4<BR>• 15 bearings have been delivered as spare parts<BR>AGB Hand Cranking Bearing<BR>Potential Affected Population<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 11<BR>73 CFM56-7B are equipped with handcranking bearing coming from<BR>the same grinding batch<BR>Most AGB have more than 2,000 hours<BR>AGB Hand Cranking Bearing<BR>Potentially Affected Population<BR>AGB handcranking aging repartition<BR>6<BR>0<BR>6 6<BR>16<BR>14<BR>8<BR>12<BR>5<BR>0 2 4 6 8<BR>10<BR>12<BR>14<BR>16<BR>18<BR>0-500<BR>500-1000<BR>1000-1500<BR>1500-2000<BR>2000-2500<BR>2500-3000<BR>3000-3500<BR>3500-4000<BR>>4000<BR>Hours<BR>Number of AGB<BR>1 Failure<BR>2 Failures<BR>1 Failure<BR>Data as of December, 2001<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 12<BR>• Crack propagation rate very slow, captured through regular<BR>MCD Inspection (500 hours)<BR> No need to implement a specific inspection<BR>• Infant mortality type of failure<BR>• Plan to inspect new bearings regarding residual stress<BR>• Retrieve, all spare parts (15) from the identified Batch<BR>• Proposed to replace Bearing line #4 & line #8 at Shop Visit<BR>for engines having a suspected bearing and accumulated less<BR>than 2,500 hours<BR> Bearing line #8 loaded two times less than line #4<BR>AGB Hand Cranking Bearing<BR>Action Plan<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 13<BR>AGB Hand Cranking Bearing<BR>Potentially Affected Batch<BR>Failed Part<BR>L8(Boeing)<BR>Bearing S/N<BR>L 4(Boeing)<BR>Bearing S/N AGBS/N Engine S/N TSN CSN<BR>L8(Boeing)<BR>Bearing S/N<BR>L 4(Boeing)<BR>Bearing S/N AGBS/N Engine S/N TSN CSN<BR>EB046343 WQ3520 876646 3900 2333 EB046465-8 EB046466-7 WQ3561 888103 1759 836<BR>EB046380 EB046366 WQ3521 876649 4100 2464 EB046632-T EB046633-R WQ3576 888104 2191 1549<BR>EB046364 EB046365 WQ3507 876651 4066 1920 EB046619-K EB046618-L WQ3569 888105 2191 1549<BR>EB046409 EB046406 WQ3543 876662 4100 2464 EB046568-4 EB046530-W WQ3568 888107 2800 1159<BR>EB046415 EB046353 WQ3541 876663 3054 1281 EB046621 EB046620-D WQ3570 888108 1554 1486<BR>EB046358 EB046357 WQ3515 876672 3900 2333 EB046591-R EB046590-T WQ3592 888109 2601 2103<BR>EB046345 EB046341 WQ3524 876674 1547 1850 EB046604 EB046605-9 WQ3591 888110 2617 1523<BR>EB046286 EB046299 WQ3545 876675 1547 1850 EB046297 EB046298 WQ3552 888111 2617 1523<BR>EB046288 EB046280 WQ3546 876678 3070 2170 EB046492 EB046532-U WQ3577 888112 2601 2103<BR>EB046397 EB046276 WQ3547 876679 3176 1229 EB046577-K EB046594 WQ3594 888113 1403 1342<BR>EB046552-T EB046495-M WQ3563 876680 3611 1237 EB046527 EB046579-H WQ3605 888116 3849 2238<BR>EB046505-A EB046498 WQ3562 876681 3070 2170 EB046606 EB046529-5 WQ3600 888119 2433 1890<BR>EB046497 EB046496 WQ3564 876682 1476 1834 EB046479-J EB046478-K WQ3560 888120 2937 2282<BR>EB046293 EB046295 WQ3551 876683 2343 1632 EB046578 EB046609-5 WQ3596 888121 2937 2282<BR>EB046453 EB046452-U WQ3558 876684 2866 1626 EB046546-7 EB046511-W WQ3584 888122 1435 1421<BR>EB046480-C EB046481-B WQ3557 876686 1650 658 EB046518 EB046528-6 WQ3598 888123 2433 1890<BR>EB046349 EB046347 WQ3526 876687 2365 1578 EB046635 EB046634-P WQ3588 888124 3501 2093<BR>EB046494-N EB046561-B WQ3579 876689 2365 1578 EB046608 EB046599-6 WQ3599 888125 3501 2093<BR>EB046362 EB046363 WQ3523 876690 3654 1330 EB046622 EB046612-U WQ3608 888131 2301 1424<BR>February 2002 WTT face to face CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 14<BR>AGB Hand Cranking Bearing<BR>Potentially Affected Batch<BR>Failed Part<BR>L8(Boeing)<BR>Bearing S/N<BR>L 4(Boeing)<BR>Bearing S/N AGB S/N Engine S/N TSN CSN<BR>L8(Boeing)<BR>Bearing S/N<BR>L 4(Boeing)<BR>Bearing S/N AGB S/N Engine S/N TSN CSN<BR>EB046508 EB046489 WQ3574 876691 3734 2219 EB046595-L EB046596 WQ3573 888141 3257 1895<BR>EB046545-8 EB046544-9 WQ3580 876692 4173 2455 EB046611-V EB046523-B WQ3593 888143 2663 1063<BR>EB046526-8 EB046525-9 WQ3567 876693 2128 1186 EB046543-A WQ3582 888144 2663 1063<BR>EB046472-T EB046471-U WQ3555 876694 3695 2166 EB046469-4 EB046482-A WQ3554 888147 1234 842<BR>EB046512-V EB046507 WQ3575 876696 2666 2144 EB046565-7 EB046567-5 WQ3587 888148 17 12<BR>EB046490 EB046509 WQ3572 876697 2666 2144 EB046517-N EB046516-P WQ3583 888149 2325 1334<BR>EB046531-V EB046533-T WQ3581 876698 0 0 EB046638-K EB046639 WQ3590 888150 2279 1673<BR>EB046557-L EB046556-M WQ3586 876699 3755 1840 EB046499 EB046500 WQ3565 888152 489 496<BR>EB046327 EB046323 WQ3542 876744 1821 1535 EB046464-9 EB046477-L WQ3559 888153 2547 1086<BR>EB046394 EB046393 WQ3525 876745 1136 1086 EB046572-R EB046586-5 WQ3607 888160 3165 1555<BR>EB046296 EB046294 WQ3549 876746 1874 1604 EB046593-N EB046592-P WQ3595 888172 2138 1434<BR>EB046436-P EB046637-L WQ3589 876748 1449 1232 EB046616-N EB046615-P WQ3597 888189 2641 1196<BR>EB046374 WQ3519 877645 2315 1088 EB046574 EB046598 WQ3602 888196 0 0<BR>EB046361 WQ3518 877648 1453 1095 EB046576 EB046600-E WQ3609 888204 3621 1296<BR>EB046396-M EB046398 WQ3522 877660 1272 1895 EB046597-J EB046582-9 WQ3610 888228 2210 1262<BR>EB046287 EB046407 WQ3544 877667 3495 2069 EB046584 EB046585 WQ3601 888235 13 10<BR>EB046279 EB046281 WQ3548 877676 2343 1632 EB046284 EB046278 WQ3550 888238 3274 974<BR>EB046468-5 EB046467-6 WQ3556 877685 4169 2451 EB094429-2 WQ5004 888534 774 506<BR>EB046510 WQ3578 877695 3695 2166 EB046602-C EB046617 WQ3606 889130 2314 1352<BR>EB046285 EB046277 WQ3553 888101 2506 1458 EB046587-4 EB046588-3 WQ3585 889132 2301 1424<BR>EB046321 EB046316 WQ3566 888102 3654 1330 EB046642-A EB046640-C WQ3571 889151 17 12 :victory: :victory: CFM AGB Hand Cranking Bearing Failure
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