cfm 56 compressor surge presentation
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8/7/2019 CFM 56 Compressor Surge Presentation
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Compressor surging of Boeing 737-800 leftengine
CFM-56 7B engine
20th
August, 2009 Launceston to Sydney, Australia
www.lh5.ggpht.com Accessed Nov.4 , 2010
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Fuel Flow (FF) decreased Exhaust Gas Temperature (EGT) increased
35 minutes after takeoff
High Pressure Compressor (HPC) surge Engine set to flight idle
Aircraft returned safely
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B 737-800 Power Plant Training Manual, ALTEON
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B 737-800 Power Plant Training Manual, ALTEON
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Investigated by Australian Transport SafetyBoard (ATSB)
Borescope inspection conducted
Flight Data Recorder (FDR) and cockpit voicerecorder sent to ATSB
36 similar incidents have occurred
Engine sent to GE facility
◦ Full engine teardown and inspection
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Borescope inspection on the left engine◦ Damage to HPC rotors
◦ Missing HPC seal segments around 3rd stage stator
◦ Loose HPC seals observed on 1st and 2nd stage
FDR data analysis◦ FF & EGT changed over the last two flights
Engine teardown◦ Seal segments
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ATSB, Aviation Occurrence Investigation A0-2009-053, Final Report, July 2010
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ATSB, Aviation Occurrence InvestigationA0-2009-053, Final Report, July 2010
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Some airline operators have changed checkintervals
Manufacturer has redesigned parts
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1. The check times should be reduced2. Investigation of improved assembly,
material, better fitting
3.
Up-to-date Engine Health Monitoring (EHM)
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Material
selection
Assembly
procedureMaintenance
Industry
practices
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Failure rate influenced by◦ Maintenance check intervals
◦ Materials selection
◦ Assembly procedures
Constant monitoring can reveal problems