787起落架+(1).ppt

HydraulicsandLandingGearSystems DeanHefflingerBoeingCommercialAviationServicesMay June2005Presentedto 787Engineering MaintenanceConference Agenda 5000psiHydraulicsSystemConfigurationUpdateHydraulicArchitectureSystemInterfacesComponentInstallationsLandingGearActuationSystemOverviewLandingGearActuationSystemSteeringSystem 5 000psiHydraulicSystemReducedweightProvenLeft CenterandRightindependentsystemarchitecture HydraulicPowerGenerationFour27gpmElectricInductionMotorPumpsTwo25gpmEngineDrivenPumpsOne19gpmRamAirTurbine HydraulicSystemArchitectureOverview ControlandIndicationIntegratedintoCommonCoreSystem CCS Flightcrewinterfacessimilarto777CommonmotorcontrollersforElectricMotorPumps HydraulicSystemDistributionVolumeintegrationbyPartners HydraulicSystemArchitecture HydraulicSystemArchitecture cont 5000psioperatingpressureSavesweightonfluid tubing reservoirsUtilizelowdensityBMS3 11fluid currentlyclassifiedasTypeIVClass1 TypeVGradeAorBHydraulicInterfaceFunction HYDIF software PartofCommonCoreSystem CCS CommonhydraulicpumpsonEDPsandEMPsElectricMotorPumps EMPs FloodedInductionMotor cooledbyhydfluidfrompumpcasedrain changefromDCmotors 27 37GPM 5000psiMotorcontrollerforstarting controllingmotorspeedBrakeSystemisnothydraulic HydraulicSystemArchitecture cont Newcontrolledsystemoperatingtemperaturetoapproximately 100 160 FTemperaturecontrolmaintainedbyabypassvalveandfueltankheatexchangerineachsystemBypassvalveisamechanicalthermostattypedevicelocatedonthecasedrainfiltermoduleBypassvalveisdesignedfortwopositions Closed flowthroughtheheatexchanger only Open apercentageofflowbypassingtheheatexchanger HydraulicSystemArchitecture cont NobleedairusedforhydraulicpowerBootstrapReservoirChosenbecausebleedairnotavailableforreservoirpressurizationChangefromtraditionalair over oilconfigurationBootstrapsystemutilizeshydraulicsystempressuretopressurizereservoirProvendesignonDouglasmodelairplanesDC 10 MD 11717 DC 8 DC 9 MD 80 MD 90 HydraulicSystemsBootstrapReservoirSchematic Highpressure Red 5000psiLowpressure Blue HydraulicSystemArchitecture cont Groundtestthatrequire5000psipressure LandinggearretractionRATfunctionaltests GSE HighpressurehydraulicleakagechecksFlaps slatsoperation hydraulicmode priorityvalve PrimaryflightcontrolsactuationconfidencetestHydraulicPowerOptionsforGroundTests APUgeneratorThreeorFourexternalgroundpowersourcesTwoexternalgroundpowersourcescanprovidelimitedhydraulicpowerinmaintenancemode5000psigroundcart HydraulicSystemTransportElements SystemPressureTubingTitanium Ti 3 2 5RequiresthickerwalltubingQualificationto5080psiforindustrycommonalityThreatzoneswilluse21 6 9CREStubing throwntreadarea pressuredome etc ReturnPressureTubingThinwalltitanium Ti 3 2 5Aluminuminsidethefueltanks HydraulicSystemTransportElements cont Repairprocessesandtechniquesfor5 000psitubingareanticipatedtobenearlyidenticaltocurrentairplanesProcessesandtechniquesusedoncurrentairplaneswillbeusedwithdifferentpartsExamplerepairmethodsbeingdevelopedinclude Cut outanddrop inreplacementtubingsectionsusingexistingswagingtechniques5 000psiflexhosespermittedforrepairinlieuofhardtubingruns5000psiTitubingreplacementwith5000psiCREStubingusing21 6 9isplanned similarto3000psisystems ReplacementwithOEM builttubeassembliesSimilarto3000psiairplanes BoeingwilloffertocooperatewithAirbustoharmonizerepairmethodsandrepairtools HydraulicSystemTransportElements cont HosesCRES Kevlar newspecification SAEstandard for5000psiFittingsPermanent5000psiTitubing AxiallyswagedfittingsReturntubing InvestigatingtheuseofaxialswagedfittingsRe connectable5000psire connectablefittingswilluseveryfinethreads compatiblewithAirbus Newre connectabletubeendfitting HydraulicSystemTransportElements cont Wired nut AllowssleevetoassembleoffaxisEliminatestubetwistReducesfrictionandincreasessealingforce Sphericalacornsealingsurface Allowssealingwithoff axisassemblyLackofpilotpreventsjamming reducescostGritblastingnotallowedonsealingsurfacesEliminatechattermarksandout of roundsealingsurfaces union sleeve B nut SolidfilmlubricatedB nut NewRe connectableTubeEndFitting HydraulicSystemArchitecture HydraulicSystemsFlightDeckInterface CCS HYDIF DisplayFunction SensorInputs CCS IssuesCommandstoHydraulicSystemComponents CHydSystemComponents LHydSystemComponents RHydSystemComponents HydraulicSystemsComponentLocations HydraulicSystemsComponentLocations ElectricMotorPump EMPInstallationinAftEngineStrutFairing EMPMotor Reservoir ReturnFilter CaseDrainFilter PressureFilter GSEConnections EMPPump EMPandReservoirInstallationWingtoBodyFairing EMP Reservoir Filters ViewLookingOutboard Forward UP FWD EMPandReservoirInstallationWingtoBodyFairing ViewLookingForward UP FWD HydraulicSystemsRamAirTurbine RATInstallationWingtoBodyFairing UP FWD ViewLookingDownandAft LandingGearSystems LandingGearActuation SteeringArchitecture Overview NoseWheelSteeringSystemSteer By WireIntegratedwithFlightControlsDualtillersarebaseline5000psiactuation LandingGearActuationSystemActuation SequencingBy WireLowerpartcountandweightAdvancedhealthmonitoring5000psiactuation LandingGearSystemsNewControl by Wire LandingGearActuationElectroniccontrolandsequencingProximitysensorstomonitorLandingGearandDoorposition controlsequencingSteeringControlControl by wirerudderpedalsanddualtillers LandingGearControlHighlights LGControlSystem DoesnotuseanyindicationsysteminputstoapplyvalvecommandsTworedundant Control proxsensorsareinstalledateachlocationLGPositionIndication ProvidespositioniconsandalertmessagesforlandinggearandgeardoorsStatusmessagesandmaintenancepageinformationprovidedbyeitherLGIndicationorLGControlsoftwareasappropriateDependsonproximitysensordataLGsoftwareinCCSprovidesinformationtoAlerting Displayssoftware NormalLandingGearActuationandIndicationSystemsOverview LGAControlOverview AlternateExtension GroundDoorReleaseSystemsOverview NoseWheelWell ComponentLocations DoorControlValve NLGAuto off BypassValve NLGDoorSafetyValve NGLockActuator NLGControlValve DoorActuator AltExtDoorReleaseActuator NLGAltExtReleaseActuator RetractActuator LeftMLGWheelWell ComponentLocations MLGDoorActuator MLGDoorControlValve MLGControlValve MLGAuto offBypassValve MLGDoorLockActuator RightMLGWheelWell ComponentLocations MLGDoorActuator MLGAltExtReleaseActuator MLGDoorLockActuator MLGUplockActuator MLGDoorAltExtReleaseActuator hidden MechanicalSystemsNLG ComponentLocations MechanicalSystemsMLG ComponentLocations MechanicalSystemsSteeringSystem SteerbyWireElectronicallycontrolledFaultdetectionandisolationIncorpora