Boeing Components & Accessories #4 Bearing Program Status

航空发表于 2011-4-10 17:44:04

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航空发表于 2011-4-10 17:47:16

CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 1 #4 Bearing Program Status Components & Accessories CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 2 #4 bearing P/N installed on CFM56-7B 305-355-717-0 335-352-301-0 335-352-302-0 340-167-901-0 # 4 Bearing Status Background HP/LP Intershaft bearing • Constraints  Bearing exposed at each shop visit  Sensitive to agressors (handling, assembly , contamination…) & manufacturing variability • Advantages : – Engine length reduction – Performance retention – Weight reduction CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 3 CFM56-All - UER & IFSD rates , #4 bearing fail cause IFSD 0.00 1.00 2.00 3.00 4.00 Fail per million EFH - 12 month rolling 0 100,000,000 200,000,000 Cumul effective flight hours UER + IFSD "UER" 1.32 as of July02 # 4 Bearing Status CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 4 CFM56--7B - UER & IFSD rates , #4 bearing fail cause "UER" IFSD UER + IFSD 0.00 2.00 4.00 6.00 8.00 Aug-98 Feb-99 Aug-99 Feb-00 Aug-00 Feb-01 Aug-01 Feb-02 Fail per million EFH - 12 month rolling 0.88 as of July02 CFM56-7B Average Better Than Global CFM Experience # 4 Bearing Status CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 5 Ev# UER IFSD ESN DATE E.TSN E.CSN P/N 1 1 874125 May/01/1998 520 220 335-352-301-0 2 1 874254 Nov/01/1998 834 255 335-352-301-0 3 1 875314 Dec/30/1998 1142 409 335-352-301-0 4 1 874424 Sep/15/1999 1991 1271 305-355-717-0 5 1 875529 Oct/19/1999 1225 791 305-355-717-0 6 1 874596 Dec/14/1999 1997 650 340-167-901-0 Prod° stop 12-01 SB in progress 7 1 874219 May/27/2000 5532 1814 305-355-717-0 8 1 874669 Jul/18/2000 4844 1790 340-167-901-0 Prod° stop 12-01 SB in progress 9 1 874103 Sep/29/2000 2975 1124 305-355-717-0 10 1 874972 Nov/19/2000 3551 1687 340-167-901-0 Prod° stop 12-01 SB in progress 11 1 876424 Dec/29/2000 943 670 305-355-717-0 12 1 876403 Jan/27/2001 1422 875 305-355-717-0 13 1 876686 Mar/23/2001 824 326 340-167-901-0 14 1 874581 Aug/05/2001 6245 4662 340-167-901-0 15 1 875652 Feb/28/2002 7908 5485 340-167-901-0 16 1 876336 Mar/05/2002 6907 4068 305-355-717-0 17 1 874816 May/31/2002 5465 2042 340-167-901-0 18 1 876150 Jul/22/2002 7309 2504 340-167-901-0 CFM56-7B #4bearing events summary Prod° stop 12-01 Prod° stop 12-01 Actions SB in progress SB in progress Batch of 47 suspect parts identified Production stopped in 1998 SB72-180 & 72-192 SB72-328 & 72-329 • reliability and quality monitored thru failure rates and failed bearing investigations • PN301 (retired > 1998) and PN 901 (thru2002) showed deviant failure rates • 2 ea.PN 717 from one defective batch • random other PN717 failures within large experience # 4 Bearing Fleet Monitoring CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 6 #4 Bearing P/N340-167-901-0 • Reliability and quality monitored thru failure rates and failed bearing investigations  P/N340-167-901-0 showed deviant failure rates (See previous table)  P/N 901 retirement program decided – From Production – From in-service engines when exposed at Shop visit regardless of age – SB72-0395 released September, 2002 # 4 Bearing Status CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 7 Material Improvement Outer race typical failure ----> improved outer race Introducing new Outer Race material : 32 CDV 13 + nitrogen hardening  deep nitrite material – material structure gives high crack resistance – high compressive stress level --> high resistance to damage propagation (spalling) : aggression (dents, contamination) effects reduced  successful tests – typically damaged samples  better resistance than M50 to spalling propagation evidenced – large engine tests program satisfactorily achieved  Implemented on production engines August, 2002  Field implementation SB72-352 October, 2002 32CDV13 Implemented to improve outer race reliability # 4 Bearing Status CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 8 #4 brg vibration screening • Tool 856A2679 developed to measure roller passing frequency  Based on development test bearing failure experience – Tested with intentionally pitted bearing -- refined signature  To allow to early detect damaged bearing H (N2-N1) Tool 856A2679 HP N2 BP N1 #4R detection message Accelerometer 1 Accelerometer 2 856A2679G0x Tool available for installation in CFM56 shop test facilities #4 brg Vibration Screening # 4 Bearing Status CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 9 • Test cell and on-wing runs system - tool 856A2679- accumulating experience – CFM Production facilities and overhaul cells equipped – Less than 1% « delinquent » expected (experience) – Continuous working together efforts with shops to refine criteria • Screening procedure being implemented in the ESM for all CFM56 engine models • In February, 2003 ESM revision #4 bearing Vibrations Survey Initiative To Help Capture Damaged Bearing #4 brg vibration screening (cont’d) CFM56-7B WTT Meeting - September,25-26/2002 CFMI / Boeing Proprietary Information - Unauthorized Disclosure, Use, or Export are Prohibited 10 Summary • CFM56-7B experience better than CFM experience • Material Improvement • 32 CDV13 material • higher outer race reliability • new bearing introduction expected 4 Qr 2002 for CFM56-7B • P/N -901 Shop Plan Defined, and issued • SB72-0395 issued in September, 2002 • Damage Survey System • #4 bearing vibration survey initiative for outer Race damages • CFM tool available for test cell runs • Implementation started • Screening procedure to be implemented in Feb, 03 ESM revision # 4 Bearing Status

979199501 发表于 2011-4-12 00:23:17

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CFM56-7B TRAINING MANUAL ENGINE FAN TRIM BALANCE

junbok 发表于 2011-5-13 18:54:07

看看去
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bocome 发表于 2011-7-31 05:54:29

Boeing Components & Accessories #4 Bearing Program Status

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Boeing Components & Accessories #4 Bearing Program Status

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