CFM56 Number 4 Bearing Status

航空发表于 2011-4-13 08:41:06

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航空发表于 2011-4-13 08:41:20

CFM56 Number 4 Bearing Status Overview • Fleet experience • P/N 901 Action Plan • New outer race material • Shop improvements • Monitoring system • Summary CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 3 CFM56-All - UER & IFSD rates , #4 bearing fail cause IFSD Feb00 : 1,80 Jan02 : 0.97 0,00 1,00 2,00 3,00 4,00 5,00 Fail per million EFH - 12 month rolling 0 100 000 000 200 000 000 Cumul effective flight hours UER + IFSD "UER" Fleet Experience # 4 Bearing Reliability on CFM56 Fleet Has Been Improving Since 1999 However, Some Variability Between Engine Models CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 4 Fleet Experience 1999 2000 2001 IFSD UER IFSD UER IFSD UER -5C 10 (3.71) 3 (1.11) 6 (1.84) 2 (0.61) 5 (1.52) 1 (0.30) -7B 2 (1.07) 1 (0.54) 2 (0.57) 3 (0.85) 1 (0.19) 2 (0.39) -3 4 (0.37) 5 (0.46) 5 (0.46) 5 (0.46) 3 (0.28) 7 (0.66) -5A 4 (1.62) 2 (0.81) 2 (0.78) 1 (0.39) 2 (0.74) 2 (0.74) -5B 0 (0.00 ) 0 (0.00) 0 (0.00) 1 (0.54) 2 (0.80) 0 (0.00) (…) Rolling average in event number per MEFH Failure Rate Is Higher on CFM56-5C Model Events distribution by engine model and by year CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 5 0 10 20 30 40 50 60 2000 6000 10000 14000 18000 22000 TSN - TSI Number of failures TSN (1st run) TSI (2nd run & above) Fleet Experience - Failure Distribution Bearing Failure Has an Infant Mortality Characteristic Over 80% of Failures Below 6000 Hrs Since LPT Module Installation CFM56 #4 Bearing Failures Ages Distribution (February 2002) CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 6 P/N 901 Action Plan • P/N 340-167-901-0 (SNR Source) is experiencing a higher failure rate than than the other P/Ns - About 850 parts reported to be installed through CFM tracking database - 15 reported failures: 1 on -3, 2 on -5A, 5 on -7B and 7 on -5C - P/N 901 averaged MTBF on CFM fleet is about 277 K hours - To be compared to 1,300 K hours for other P/Ns • Specialist working group has been formed to investigate these events and failure identify root cause & action plan CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 7 P/N 901 Action Plan • Quality inquiries on bearings have not evidenced abnormalities in manufacturing process of this P/N • As of today, no major contributors on engine environment found through failed engine investigations • Precautionary actions - P/N 901 installation on CFM production engine was stopped in 3Q01 - P/N 901 delivery as spare parts resumed in 3Q01 - Shelf cleaning of zero time P/N 901 in process • Field action plan for installed P/N 901 being evaluated CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 8 New Outer Race Material • 90% of failures confirmed to be initiated by outer race spalling • Outer race material change from M50 to 32CDV13 deep nitriding - Material structure more resistant to crack initiation - Improved residual stress profile restricts crack / spall propagation - Over 21,000 cycles completed with no failure during engine ground tests • Introduced on -5C production for Dec 01 A/C delivery - Spare parts starting to be available for -5C • Being introduced on other engine models for A/C delivery by July 02 More Resistant 32CDV13 Material for Outer Race Being Introduced on All CFM Engine Models CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 9 • CFM56-5C LPT installation tool modified - Improved stiffness to keep perpendicularity between LPT shaft and case - Already in place for other engine models - All major -5C overhaul shops equipped with this new tool • Overhaul shops Best Practices - Assembly line and shop practices improvements identified on 1999 - Cleanliness / Preservation / Handling / Installation - Bearing “Best Practices” CESM 009 issued on 1999 to shops in order to highlight bearing handling and assembly practices - Periodic meetings with overhaul shops to re-emphasize these recommendations Shop Improvements Post Shop Visit Failures Being Reduced Since 99 Through Best Practices Embodiment CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 10 Monitoring System • Algorithm to detect #4 bearing outer race distress with existing engine vibration sensors has been developed • Multiple use tooling - Stand alone tool P/N 856A2679 available to screen engine - For engine test cells ( G01 ) - All CFM production test cells have been equipped - Major -5C overhaul shops are equipped - For A/C ground run ( G02 ) - Tool validation achieved on March 02 - Airborne System - Program launched with Boeing / VibroMeter - SER to be started by July 02 - Not launched on Airbus applications as of today Need to Gather Experience With This New Monitoring Tool CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 11 Monitoring System N1 N2 No. 1 brg FFCC/ TRF Portable / Test Vibration Monitoring Unit H (N2-N1) Tool 856A2679 HP N2 BP N1 #4R detection message Accelerometer 1 Accelerometer 2 CFM56 Operators Conference – May 21 - 22, 2001 CFM Proprietary Data Unauthorized Disclosure Prohibited 12 Summary • # 4 Bearing reliability on CFM56 fleet has been improving since 1999 - However, some variability between engine models, with highest rate on CFM56-5C model • Higher failure rate with P/N 901 - P/N 901 has not been installed on production engines or delivered as spare parts since 3Q01 - Field action plan being evaluated • More resistant 32CDV13 material for bearing outer race being introduced on all CFM engine models • Post shop visit failures have been reduced since 1999 through Best Practices embodiment • Monitoring system for engine test cell and A/C ground run is available - Need to gather experience with this new tool

show616 发表于 2011-4-13 09:50:47

谢谢LZ分享！

kinran 发表于 2011-6-4 23:28:24

:victory: :victory:

bocome 发表于 2011-7-31 04:35:01

CFM56 Number 4 Bearing Status

bei1999 发表于 2016-5-3 06:05:45

737-800中文AMM手册

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CFM56 Number 4 Bearing Status