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ContentsContentsGeneraldescriptionTheductingsystemandSOVStarterSwitchingThestartsequenceFunctionalblockFaultreasonsFaulttreeandisolationprocedureGeneralDescriptionGeneralDescriptionCFM56-5C1.ManufacturedbyCFMInternational2.UsedonAirbusA340-200andA340-3003.Thrustrating:31200~~34000lb.f4.Features:LowestSFCofCFM56familyLowernoiseHighthrust-to-weightratioSecond-generationFADECLong-duct,mixed-flownacelle5.StructuralData1stagefanand4stagebooster9stagecompressor4stageHPturbine1stageLPturbineDuctingsystemDuctingsystemAircomefromthreesource:1.APU2.Groundaircart3.OtherengineRHandLHconnectthroughacrossbleedvalveCheckvalvetoprotectAPUDuctingsystemDuctingsystemShut-offvalveShut-offvalveBetweenthetopandlowerductUsedtocontroltheairquantityControlledbyECUStarterStarterSwitchingSwitchingEachpushbuttonservesfor:•manualstart•motoringEnablestartsequenceChooseworkconditionTostart:1:ENGSTARTsettoIGN/START2:ENGMASTERto“ON”StartsequenceStartsequenceStage1:StarterdriveEngine(openSOV)Stage2:TurbinestartdriveEngine(N2>22%ignition)Stage3:starterstopworking(N2>50closeSOVcutignition)112233FunctionaldiagramFunctionaldiagramGroundaircartShut-offvalveTopairductprecoolerAPUairTheotherengineairECUHProtorRadialshaftStarter/turbineLowerairductmechanicalmechanicalmechanicalmechanicalmechanicalmechanicalelectricalelectricalmechanicalFunctionaldiagramFunctionaldiagramFaultReasonsFaultReasonsTopandlowerstarterduct(ductandconnectionsleak)StarterSOV(can’topenfully)Starter(tearsandFODorhighfriction)112233FaultTreeFaultTreeFaultIsolation