CFM Components & Accessories Accessory GearBox Bearing Line #4

航空发表于 2011-4-23 10:40:15

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航空发表于 2011-4-23 10:40:27

CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1 Accessory GearBox Bearing Line #4 Components & Accessories • Manufacturing Quality Issue • New failure CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2 • 3 cases of metal particles retrieved in AGB/TGB MCD during routine inspection  Low time failure phenomenon (failures occured on engines < 2500 H) Handcranking Pad Ball Bearing spalled AGB Housing Background • Subsequent investigation revealed AGB handcranking pad gearshaft ball bearing failure (AGB Line #4)  Bearing outer race spalling  Bearing P/N 340-052-602-0  P/N 340-052-602-0 also installed on IDG Gearshaft Bearing (AGB Line #8) – no problem reported to date. • Bearing P/N 340-052-602-0 also installed on CFM56-3 No event reported to date AGB line #4 Quality issue CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3 Investigation • Three(3) failed bearings came from a single grinding batch  incriminated batch includes 361 bearings  73 CFM56-7B AGB’s in service equipped with P/N bearings 340-052-602-0  15 bearings delivered as spare parts AGB handcrancking aging repartition on -7B 1 21 16 16 6 7 7 5 1 0 2 4 6 8 10 12 14 16 18 20 22 24 0-500 500-1000 1000-1500 1500-2000 2000-2500 2500-3000 3000-3500 3500-4000 >4000 Hours Number of AGB 1 Failure 2 Failures Low time phenomenon < 2,500 EFH AGB line #4 Quality issue CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4 Corrective actions • Corrective actions have been implemented by vendor  Production improvements dedicated to the grinding process : Tool replacement • Customer Communication released through Fleet highlite article • SB 72-A0368 released May 28th, 2002 cat.3  Replacement of Bearing P/N 340-052-602-0 at engine SV opportunity for engines < 2500H since EIS AGB line #4 Quality issue CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5 • One new event leading to IFSD  heavy chips found in MCD  Low time failure phenomenon (failure occured on engine < 1300 H) • Investigation revealed AGB line#4 bearing failure  Bearing P/N 340-052-602-0 outer race spalling  Bearing not in the previous affected batch Background AGB line #4 New Failure  Investigation results identified root cause unusual Dendritic macrostructure which could potentially affect the material characterisitcs  Random phenomenon occuring due to abnormal heterogeneous structure typical of material coming from the end of the bar  Quality investigation still in process with supplier No link with previous Issue On condition view of defective bearing CFM56-7B WTT Meeting - September,26-27/2002 CFM / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 6 Investigation results location of transversal cross section outer ring General view showing unusual dendritic structure at mid portion compare to normal grain flow at each side Abnormal heterogeneous structure with unacceptable dendritic appearance likely more from casting material instead of hammered material AGB line #4 New Failure

kinran 发表于 2011-6-4 22:58:22

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bocome 发表于 2011-7-31 05:12:12

CFM Components & Accessories Accessory GearBox Bearing Line #4

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CFM Components & Accessories Accessory GearBox Bearing Line #4