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飞机空调系统故障分析与排除 Introduction: Airconditioningisanimportantfeatureofmodernaircrafts.Ithelpstomaintainacomfortableandsafeenvironmentforpassengers,crewanddelicateelectronicequipment.However,likeallsystems,airconditioningsystemsmayexperiencemalfunctionsandbreakdowns.Theaircraftairconditioningsystemisacomplicatedsystemwithseveralpartsandcomponents.Therefore,itisessentialtolearnabouttheairconditioningsystems,themalfunctionsthatmayoccurandwaystodiagnoseandfixthesemalfunctions. ComponentsofAirConditioningSystems: TheAirconditioningsysteminairplanesconsistsofseveralcomponents.Theventilationsystemcontrolsairflowthroughoutthepassengercabin.Theairconditioningsystemcontainsacoolingsystemwhichlowersthetemperatureoftheairpulledintotheaircraft.Thisisachievedthroughtheuseofheatexchangers,refrigerationunits,condensersandheatexchangers.Airhandlingunitscontroltheflowofairintoandoutofthecabinandcirculatetheairthroughoutthecabin.Theelectroniccontrolsystemsinthecockpitmonitorthetemperatureandpressureoftheairandcanalsoregulatethetemperatureofthecabin. CommonMalfunctions: Althoughairconditioningsystemsinaircraftarewell-designedandtested,somemalfunctionscanoccur.Thesemalfunctionsmaybecausedbymechanicalproblems,poormaintenancepractices,powersurges,andotherfactors.Someofthecommonmalfunctionsinclude: 1.Dirtyfiltersthatcanobstructtheflowofair.Thiscanleadtoinsufficientcooling,decreasedairflow,andoverworkingofthesystem. 2.Lowrefrigerantchargethatcancausethecoolingsystemtofail. 3.Evaporatorcoilblockagesthatcanreduceheatexchange,affectingcoolingcapabilityandairflow. 4.Condensatedrainclogsthatcanleadtowateraccumulationinthesystem. 5.Electricalfaultsorpowerfailuresthatcanshutdownthesystem. DiagnosisofAirConditioningMalfunctions: Theprocessofdiagnosingairconditioningmalfunctionsinvolvesseveralsteps.Thefirststepistoensurethatallthecontrolsandswitchesaresetcorrectly.Next,thetechnicianneedstocheckforanysignsofamechanicalproblem.Inspectingthefiltersandcoilscanrevealanyblockages,andleakscanbedetectedwithaleak