新航排故秘籍.docx

新航排故秘籍.docx

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新航排故秘籍

Chapter21–AirConditioning

1.WhatcancauseaPacktotrip?

Ans:

RAI&RAEoutofsequence,PackDischargeOvertemp&CompressorDischargeOverheatsensorfailure,Turbinebypassvalvefailure,AirCycleMachinefailure,PackControlShut-OffValvefailureandwronglyinstallofthewaterseparatorsinthereversedirection（underwear/socks）.

2.Howdoestheaircraftmaintainitstemperatureinthedifferentzones?

Ans:

CabinTempSelector–ZTC–ZoneTrimAirModulatingValve.

3.Pilotscomplaincockpittemperaturetoohotortoocold,whatarethecausesforfluctuationofcabintemperature?

Ans:

FltDeckZoneTrimAirValveorFltDeckZoneTempSensor.

4.Whathappenswhenequipmentcoolingfails?

Ans:

Gndcrewwarninghornwillsound,EICASmsg“EQUIPCOOLING”andGndExhaustValvewillclose.

5.Incaseoffireinairorongnd,whathappenstotheequipmentcooling?

Ans:

6.Whatarethecausesforequipmentcoolingfailure?

Ans:

E/Eairsupplyovertemp（overheatswitchtemp>145F）,Fltdecklowflow,E/Elowflow,SmokeDetector,GndExhaustv/voutofposition,andanyfailureofE/Ecoolingairexhaustfan,Inboardexhaustv/vandBypassv/v.

7.F/Owhiledoinghispre-departureWACfoundthattheGndExhaustValveisinthe“CLOSED”position;howevertherewasn’tanygndcrewhorn.Whatisthelikelyscenario?

Ans:

8.Whatarethemodesofequipmentcooling,anyspecialones?

Ans:

NORM,STBYandOVERRIDEmodes.

9.Whatisthepurposeofcabinpressurization,andhowdoesitcontrolsthesetambientpressure?

WhatistheSTDcabinpressuresetat?

Ans:

Pressurizationoftheaircraftistomaintainasafeandcomfortablecabinpressurebycontrollingthesizeoftheopeningswhereairleavesthecabin.Theairleavesthrutwooutflowvalveswhicharedrivenmoreopentodecreasecabinpressureormoreclosedtoincreasecabinpressure.TheCPCSlimitstherateofchangeofcabinpressureandcontrolsthecabin-to-ambientpressuredifferential.TheSTDcabinpressureisusuallysetataround8500ft.

10.Whatarethedangersofoverpressurization,isthereanyprotectiontocounterthesesituation?

Whatshouldyoudoafterthat?

Ans:

Afteranoverpressureconditionhasbeenrelievedthevalvegateclosesbuttheblowoutdoorswillremainopentoprovideapositivevisualindicationthatanoverpressureconditionhasoccurred.

Ifaboveconditionexists,refertoPAGEBLOCK05-51-27/201andcarryoutconditionalinspectionprocedureforCabinOverpressurizationevent.

11.Pilotcomplainsheisunabletomaintaincabinpressureusingtwopacks;theotherpackwasu/sandlockedout.Whatshouldyoudonow?

Ans:

InterrogatetheCMCforExistingFaultsonChap.21-CabinPressureandrectifyanyfaultsfound.IftherearenofaultsregisteredthenrefertoPAGEBLOCK05-51-08/201andcarryoutconditionalinspectionprocedureforExcessiveCabinPressureLeakageCondition.

12.Whatkindofprotectiondoestheaircrafthaveagainstotherabnormalpressurizationcondition?

Ans:

Chapter22-Autoflight

13.HowdoAFDShelpstheaircrafttomaintainSLF?

DoesitusethePrimaryorSecondaryflightcontrols?

Ans:

14.WhataretheinputstoA/PandwhatarethedifferentmodesofA/P?

Ans:

FMC,IRU,ADC,LRRA,GPWC,PrimaryAir/GndRelay,FCU,Loc&G/Santenna,ILS,BCU,HYDIM,Go-AroundSwitchandCMC.

Thedifferentmodesare:

A/T,MachTrim,YawDamperSystem,SpeedTrim&AutomaticStabilizerTrimSystem.

15.PilotcomplainsthattheairplanewasporpoisingthroughouttheflightwithanyA/PinCMD,whatshouldyoudo?

Ans:

YoushouldperformElevatorControlSystem–Adjustment/Test（AMMPAGEBLOCK27-31-00/501）.

16.CanyouengageanyoftheA/PmodesonGnd,whichmodeisit?

Ans:

17.WhatcancausetheA/Ptodropoff（disengage）?

∙FailureofADC,LRRAandILS

∙Anelevatororaileronservocamoutmonitorwastripped

∙Anautomaticstabilizertrimfailurewhentheservosareengaged

∙A/PinflaremodewithonlyonechannelengagedinCMDmode

∙LocalinnerloopdatainvalidintheF/Dmode

∙ALTholdoroverridemodecannotbeengagedwithin4secs

∙ADCinnerloopsignalsinvalidfor4secs

∙SelftestfailuresoccurinILSorRAreceivers

∙Manualdisconnectionbypilot

18.HowdoestheA/Pcommandflowsfromthecockpittoandflowtheflightcontrols?

Ans:

MCP–FCC–ServoActuators–positionfeedbacks–cockpit.

19.Whatmodedoesourfreighteruses,SpeedorMachtrim,whatisthedifference?

Ans:

MachTrimmodesareemployedinallfreighters.ThemaindifferenceistheSpeedtrimprovidesamuchsmoothertransitionwithnewspeedchanges.

20.WhathappensinDutchRollorSideSlipconditions?

Ans:

21.Aftera/clanded,Captainnotesthatairplanebankanglewaslimitedto8degreesinRollwithanyA/PinCMD.Whatshouldyoudo?

Ans:

PerformLRRASelf-Test/BITEProcedure（34-33FAULTTRESSFigure103,Block1）.Iftheproblemcontinues,dotheradioantennaandcoaxcheck（AMMPAGEBLOCK34-33-03/401）.Ifthestillpersists,replacetheselectedFlightControlComputer（AMMPAGEBLOCK22-11-01/401）.

22.CanyoudoA/Ptestonground?

Ans:

YesyoucancarryoutAutolandUnique,AileronServo,ElevatorServoandRudderServointeractivetestonground.

23.Pilotcomplains,A/Prefusetoengageinflightafterdropout,everythingelsenormal,whatarethelikelycauses?

Ans:

ItcouldbeMCPfault,A/PDisconnectswitchoncontrolcolumnstuckorFCCfail.Inremotesituationthere-syncofFMCordisagreementofFMCcancausethistoo.

24.Duringroll-out（take-off）,A/Tsuddenlydisconnected,whatisthelikelycause?

Ans:

EECindegradedmodeortheN2SpeedcardofaparticularenginefailsduringRoll-OutwhichcausestheEECtodegradetoALTNmode.A/TisnotavailableinALTN（N1）mode;thereforeifoneengineisinALTNallotherserviceableengineshavetobeselectedtoALTN（N1）mode.AirplaneiddispatchedusingtheappropriateperformancedatafortheAlternateEECModeOperation.

25.PilotscomplainThrottleleversdonotmovetogetherduringA/Toperation,whatshouldyoudo?

Ans:

PerformThrustLeverAssemblyAdjustment（AMMPAGEBLOCK76-11-01/501）.Iftheproblemcontinues,replacetheA/Tbrakeshaftassembly（AMMPAGEBLOCK76-11-05/401）.

Chapter23-Communications

26.Whatisthepurposeofstaticdischargers?

Ans:

Staticdischargersareinstalledontheairplanetoreduceradiointerference.Thisinterferenceiscausedbyacoronadischargeemittedfromtheairplanesurfaceasaresultofprecipitationstaticandenginecharging.

27.WherecanyoufindtheSELCALcodes?

Ans:

ItisplacedontheF/OsidebelowtheND.Itisafourlettercodeuniquetothisaircraft.

28.SELCALdefectandyouhavejustreplacedtheitem,howdoyoutesttheSELCALoperationally?

Ans:

TuneyourradiotoaknownradiostationeitherusingtheVHForHFsystem.RequestSELCALcodesforyouraircraftandlistenforthetwotonechimeandthe“Call”lightonallaudiocontrolpanels.

29.CaptainnotedtheSELCALcallsdonotsoundthechimebuttheCalllightdidilluminates,whatcouldbetheproblem?

WhatiftheSELCALcallsdonotilluminateCallLight?

Ans:

IftheSELCALcallsdon’tsoundthenitislikelythattheCrewAlertingCard（AMM31-51-02/401）inMAWEAattherighthandcrawl-wayisfaulty.IftheSELCALcallsdon’tlightthenitisprobablytheSELCALdecoder（AMM23-28-02/401）.

30.HowdoestheACARStransmit,canwedoaninteractivetesttomakesureitworks?

Ans:

ACARSistransmittedusingtheVHF-C,HFortheSATCOM.YoucankeyinatestreportandsendittoOCCorrequestWxrReportfromCAAC.

31.WhereisthefixedELTlocatedandhowdoyouknowifit’sreallyworking?

Ans?

ThefixedELTislocatedinbetweenthemainsidecargodoorandD5Rontheceilingtop.Youcandoamanual“ON”testwithsomeoneincockpittolistenoutforthedistresssignalwhenswitch“ON”.Alternatively,youcanputitin“ARM”positionandvigorouslyshaketheELTtoactivatetheG-switch,whichwilltransmitthedistresssignal.

32.PilotcomplainstheSATCOMsignalstrengthisveryweak,wheredoyoulook?

Ans:

CheckExistingfaultsforChap23–SATCOMandrectifyanyfaultsfound.Iftherearenoexistingfaults,doaninspectionoftheSATCOMantennaanditsconnectors.

33.HowmanychannelsarethereforSATCOM?

Ans:

Thereare6channelsforSATCOM,1forCapt,1forF/O,2fordataand2forpassengers.

34.PilotcomplainHFnotworking,afterresettingCBmessagegoesaway,howdoyouconvincehimtotaketheaircraft?

Ans:

TunetoaknownradiostationthenclockthetimerequiredfortheCouplertotunetothestation.Makesureitislessthan15secs.Afterthatestablishcallwiththestationandcheckthereceptiononbothsides.

35.WhendoestheCVRworksandwhendoesitshutdown?

Ans:

TheCVRstartsrecordingwhenanyengineisstartedanditstopsworkingwhenthelastengineisshutdownplus5minutes.

36.HowdoyoutestthefourCVRchannels?

Plugheadsetintothecontrolpanel,thenswitchitfrom“AUTO”to“ON”.PresstheTestbuttonandmakesureyoucanseetheneedlemovesanda600hztone.Afterthat,talkintotheareamicandmakesureyoucanbeheard.FollowthatplugintotheCaptain,F/OandFirstObserverheadsetjackandmakesureyoucanhearyourownvoicewhenestablishingacall.

Chapter24–ElectricalPower

37.Describeasimplepowerdistribution.

Ans:

38.WhatisthepriorityofACpoweronGnd?

Ans:

Ifenginesarestarted,ENG–Extpower–APU.

39.Canlikesourcepowerbeparallel,howaboutunlikesources?

Ans:

OnlyEnginespowercanbeparalleltogether,therestofthepowersourcescannotbeparallel.

40.Pilotexperiencemomentarilypowerinterruptionwhenheswitchestodifferentpowersources,whatcanbethecause?

A