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

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Questions?