Download - CFM 56 Compressor Surge Case Study
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Compressor surging of Boeing 737-800 left engine
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 Safety Board (ATSB)
Borescope inspection conducted
Flight Data Recorder (FDR) and cockpit voice recorder 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 Investigation A0-2009-053, Final Report, July 2010
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Some airline operators have changed check intervals
Manufacturer has redesigned parts
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1. The check times should be reduced
2. 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
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Questions?