CFM 56 Compressor Surge Presentation

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



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



B 737-800 Power Plant Training Manual, ALTEON



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



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



ATSB, Aviation Occurrence Investigation A0-2009-053, Final Report, July 2010



ATSB, Aviation Occurrence InvestigationA0-2009-053, Final Report, July 2010



Some airline operators have changed checkintervals

Manufacturer has redesigned parts



1. The check times should be reduced2. Investigation of improved assembly,

material, better fitting

3.

Up-to-date Engine Health Monitoring (EHM)



Material

selection

Assembly

procedureMaintenance

Industry

practices



Failure rate influenced by◦ Maintenance check intervals

◦ Materials selection

◦ Assembly procedures

Constant monitoring can reveal problems



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CFM 56 Compressor Surge Presentation

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