飞机轮胎介绍

《AircraftSystem》AircraftTires2021/3/29星期一1GuangzhouCivilAivationCollege《AircraftSystem》ClassificationofTiresTypeSizePlyrating(层数）

Tubeortubeless2021/3/29星期一2GuangzhouCivilAivationCollege《AircraftSystem》ClassificationofTiresTypeⅢtireCharacteristic:

Lowpressure,piston-poweraircraft.Constructioncharacter:Thesectionwidthisrelativelywideinrelationtothebeaddiameter.DesignatingMethod:Sectionwidthandrimdiameter9.50-16tire:thesectionwidthis9.5inches,therimdiameteris16inches.2021/3/29星期一3GuangzhouCivilAivationCollege《AircraftSystem》2021/3/29星期一4GuangzhouCivilAivationCollege《AircraftSystem》2021/3/29星期一5GuangzhouCivilAivationCollege《AircraftSystem》ClassificationofTiresTypeⅦtireCharacteristic:

Extra-highpressure,jetaircraft.Constructioncharacter:

Plyratingfrom4to38.DesignatingMethod:Outsidediameterandsectionwidth38×13tire:Theoutsidediameteris38inches,thesectionwidthis13inches.2021/3/29星期一6GuangzhouCivilAivationCollege《AircraftSystem》2021/3/29星期一7GuangzhouCivilAivationCollege《AircraftSystem》2021/3/29星期一8GuangzhouCivilAivationCollege《AircraftSystem》ClassificationofTiresTypeⅧtireCharacteristic:Jetaircraft，highload-carryingability,Plyrating:4to38Constructioncharacter:Lowprofile.DesignatingMethod:Outsidediameter,sectionwidthandrimdiameter.30×11.50-14.5tire:Theoutsidediameteris30inches,Thesectionwidthis11.50inches,Therimdiameteris14.5inches.2021/3/29星期一9GuangzhouCivilAivationCollege《AircraftSystem》ClassificationofTiresDesignatingMethod:ATypeVIIIorthree-partnomenclaturetireisidentifiedby3parameters:overalldiameter,sectionwidth,andrimdiameter.Theyarearrangedinthatorderwiththefirsttwoseparatedbyan“X”andthesecondtwoseparatedbya“–.”Forexample:18X4.25—10designatesatirethatis18inchesindiameterwitha4.25-inchsectionwidthtobemountedona10-inchwheelrim.2021/3/29星期一10GuangzhouCivilAivationCollege《AircraftSystem》2021/3/29星期一11GuangzhouCivilAivationCollege《AircraftSystem》BiasorRadialTireAnothermeansofclassifyinganaircrafttireisbythedirectionofthepliesusedinconstructionofthetire,eitherbiasorradial.Traditionalaircrafttiresarebiasplytires.Thepliesarewrappedtoformthetireandgiveitstrength.Theangleofthepliesinrelationtothedirectionofrotationofthetirevariesbetween30°and60°.2021/3/29星期一12GuangzhouCivilAivationCollege《AircraftSystem》BiasorRadialTireInthismanner,theplieshavethebiasofthefabricfromwhichtheyareconstructedfacingthedirectionofrotationandacrossthetire.Hence,theyarecalledbiastires.Theresultisflexibilityasthesidewallcanflexwiththefabricplieslaidonthebias.2021/3/29星期一13GuangzhouCivilAivationCollege《AircraftSystem》2021/3/29星期一14GuangzhouCivilAivationCollege《AircraftSystem》PlyRatingItisjustastrengthindexbutinthepast.Tiresaregivenaplyrating,ratherthanspecifyingtheactualnumberoflayersoffabricmaterialusedinthecarcass.Theplyratingofatirerelatestoitsmaximumstaticloadanditsinflationpressure.2021/3/29星期一15GuangzhouCivilAivationCollege《AircraftSystem》TubeorTubelessTiresTubelesstires:one-tenthofaninchthickinnerliner“TUBELESS”onthesidewallTubetires:noinnerliner,smootherinsidesurface.no“identification”onthesidewall2021/3/29星期一16GuangzhouCivilAivationCollege《AircraftSystem》ConstructionofTireAutomobileandtrucktires1.differentspecificationsfromthoseusedforaircrafttires.2.tooperateforlongperiodsoftime.3.arelativelylargebutsteadyloadatreasonablyhighrotationalspeeds．4.arelativelysmallamountofdeflection（变形）.CarTires:acontinualdeflectionofonlyabout12to14%.2021/3/29星期一17GuangzhouCivilAivationCollege《AircraftSystem》ConstructionofTireAirplanetires1.strongenoughtoabsorbthetremendousloadsexertedonthemattouchdown.2.theymustoperateatveryhighspeeds.3.thegroundrolldurationislimited.4.adeflectionofbetween32and35%,morethantwicethatallowedforautomobiletires2021/3/29星期一182021/3/29星期一192021/3/29星期一202021/3/29星期一212021/3/29星期一222021/3/29星期一23GuangzhouCivilAivationCollege《AircraftSystem》BEAD（胎缘）Thebeadsaremadeofbundlesofhigh-strengthcarbon-steelwire,withone,two,orthreeofthesebundlesusedineachsideofthetire.Themostimportantpartofatire.Toprovidesafirmmountingsurfaceforthetireonthewheel.Allofthegroundforcesonthetireterminateinthebead.[Figure9-71]2021/3/29星期一24GuangzhouCivilAivationCollege《AircraftSystem》RubberApexStrips(橡胶填充层)Definition:Topackandstreamlinetheroundbeadbundles,sothefabricwillfitsmoothlyaroundthemwithnovoids.2021/3/29星期一25GuangzhouCivilAivationCollege《AircraftSystem》Flippers（隔离层）Definition:Layersofrubberandfabricenclosethebeadbundlestoinsulatethecarcasspliesfromthebeadwires.Function:Becausethegreatestamountofheatinthetireisconcentratedinthebeadarea,thisinsulationincreasesthedurabilityofthetire.2021/3/29星期一26GuangzhouCivilAivationCollege《AircraftSystem》CARCASSandTURN-UPS（胎体和重叠层）layersorpliesofrubber-coatednylon-cordfabric.thecordsofthefabricatanangleofapproximately450tothelengthofthestrip．thestripsextendcompletelyacrossthetireandlapbackoverthebeadstoformtheplyturn-ups.eachsuccessiveplyofthefabricisplacedinsuchawaythatthecordscrosseachotheratapproximately900tobalancethestrengthofthecarcass.2021/3/29星期一27GuangzhouCivilAivationCollege《AircraftSystem》CHAFERS

（胎缘包覆层）Definition:Layersoffabricandrubberwraparoundtheedgesofthecarcasspliesandenclosetheentirebeadarea.Function:Theyprovidechaferesistancebetweenthebeadandthewheel.2021/3/29星期一28GuangzhouCivilAivationCollege《AircraftSystem》UNDERTREAD（底胎面）Definition:Apliesofspeciallycompoundedrubberplacedoverthecarcass’.Function:Toprovidegoodadhesionbetweenthetreadandthecarcass.2021/3/29星期一29GuangzhouCivilAivationCollege《AircraftSystem》TREADREINFORCINGLAYER（胎面加强层）Definition:Oneormorepliesofnylonfabricstrengthensthetread.Function:1.toopposesthecentrifugalforcesthattrytopullthetreadfromthecarcassduringhigh-speedoperation.2021/3/29星期一30GuangzhouCivilAivationCollege《AircraftSystem》TREADREINFORCINGLAYER

（胎面加强层）2.Italsostabilizesthetreadonthecordbodyandpreventsitfromsquirming（蠕动)ormoving.3.Thisreinforcementdoesnotenterintotheplyratingofthetire,butitisusedasaguidefortheretreaderwhenbuffingthetiretoremovethetread.2021/3/29星期一31GuangzhouCivilAivationCollege《AircraftSystem》TUBELESSTIRELINER（无内胎轮胎衬层）Definition:Aspecialcompoundofrubberthatislesspermeablethantherubberusedintherestofthetire.athincoatingofrubberovertheinnerplycordsprotectsthelinerfromchafing.Function:Thelineractsasacontainerfortheairandminimizestheamountofairthatseepsoutthroughthecasingplies.2021/3/29星期一32GuangzhouCivilAivationCollege《AircraftSystem》TREAD（胎面）Definition:Thewearingsurfaceontheoutercircumferenceofthetire.Characteristic:1.Itismadeofspeciallycompoundedrubber.2.Apatternofgroovesmoldedintoitssurfacetogivethetiretherequiredtraction(附着力）accordingtothetypeofrunwaysurfacetheaircraftwillencounter.2021/3/29星期一33GuangzhouCivilAivationCollege《AircraftSystem》2021/3/29星期一34GuangzhouCivilAivationCollege《AircraftSystem》TREADPATTERNSPlainTreadPlain,orsmooth,treadisusedonsomehelicopterandonverylightairplanes.Allweathertread1.All-weathertreadshavearibtreadinthecenteranddiamondsmoldedintotheshoulders．2.Thediamond-shapedtreadpatterniseffectiveforaircraftoperatingongrassorhard-packeddirt,andtheribtreadinthecentergivesgoodtractiononhardsurfacedrunways．【Figure9-72』2021/3/29星期一352021/3/29星期一36GuangzhouCivilAivationCollege《AircraftSystem》RibTreadTheribtreadisthemostpopulartreadpatternfoundonmodernaircrafttoday.1.useonhard-surfacedrunways.2.longtreadwearlife3.goodtraction4.exceptionallygooddirectionalstability.[Figure9-73]Thewidthanddepthofthegrooves,theirplacementonthetreadaredeterminedbyoperatingconditionsofaircraftforwhichtheyaredesigned.2021/3/29星期一372021/3/29星期一38GuangzhouCivilAivationCollege《AircraftSystem》CHINE(胎脊、偏转器）Chinesordeflectorsmoldedintotheuppersidewalloftireonthenosewheel.Tiresfordualnosewheelinstallationshavechinesononesideonly,Singlenosewheelinstallationshavedualchines(deflectors)，oneoneithersideofthetire．[Figure9-74]Function:Topreventwaterorslushfrombeingthrownupbythenosewheelandenteringtheengines，[Figure9-74]2021/3/29星期一392021/3/29星期一40GuangzhouCivilAivationCollege《AircraftSystem》SIDEWALLDefinition:ArubbercoveringthatextendsfromthetreaddowntothebeadheelFunction:Toprotectthecarcassfrominjuriessuchascutsorbruisesandfromexposuretomoistureandozone.2021/3/29星期一41GuangzhouCivilAivationCollege《AircraftSystem》VENTHOLESDefinition:Ventholesinthelowersidewalltoallowtheairseepingintosidewalltoescape.Theseholesaremarkedwithpaintandmustbekeptopenwhenthetireisretreaded.Function:Whenthetirewasheated,toavoidplyseparationandthetreadtobethrownfromthetire.2021/3/29星期一42GuangzhouCivilAivationCollege《AircraftSystem》TIREINSPECTIONONTHEAIRCRAFTMostinspectionontheaircraftScheduledinspectionsofthetiresThetechnicianshouldtakealookatthetiresanytimeworkisbeingdoneinthevicinityofthegear.2021/3/29星期一43GuangzhouCivilAivationCollege《AircraftSystem》轮胎充气的基本要求1.如果将轮胎始终维持在正确压力，轮胎寿命会更长。2.如果用干燥的空气给轮胎充气，确保氧气含量不超过5%。3.如果轮胎压力比正确压力低5%或更低，则为轮胎充气。4.如果轮胎压力比正常压力低5%—15%，给轮胎充气并在24小时后检查。5.如果轮胎压力比正常压力低15—30%，拆卸并更换机轮和轮胎组件。6.如果轮胎压力比正常压力低超过30%，拆卸并更换机轮和轮胎组件。如果轮胎在压力下降后机轮转动并承担飞机重量，更换安装在轮轴对侧的机轮和轮胎组件。2021/3/29星期一44GuangzhouCivilAivationCollege《AircraftSystem》HeatDamageThegreatestenemyofanaircrafttireisheat.Heatresource:1.Theheatgeneratedwithinthetireasitrollsovertheground,thesidewallsflexandcauseinternalheat2.Theheatfromexternalsourcessuchasthebrakesorhotrunwaysurfaces.2021/3/29星期一45GuangzhouCivilAivationCollege《AircraftSystem》InflationPressure1.ThepressureshouldbecheckedDailyinspectionPreflightinspection2.Differencesinairpressurebetweendualmountedtiresshouldcauseconcern.Itdefeatsthepurposeofdualmountedtires3.Anypressuredifferenceshouldbecorrectedandnotedintheaircraftlogbook.Consulttheaircraftservicemanualtodeterminetheexacttirepressuretolerances.2021/3/29星期一46GuangzhouCivilAivationCollege《AircraftSystem》InflationPressureInflationpressureshouldalwaysbemeasuredwhenthetireiscold.Twotothreehoursshouldelapseafteraflightorbeforethepressureismeasured.Tirepressurecheckisthemostimportantpartsofroutinepreventivemaintenance.Thepressureintheaircraftservicemanual,ratherthanthatlistedinthetiremanufacturer'sproductmanuals.

Reason:tirepressuresvaryfromoneaircraftdesigntoanother.2021/3/29星期一47GuangzhouCivilAivationCollege《AircraftSystem》InflationPressureThepressurespecifiedintheairframemanufacturer'smanualisforaloadedtire,Ifservicedandinflatedofftheaircraft,theinflationpressureshouldbefourpercentlessthanthepressurespecified.(180psi,187psiintheAMM)Pressuregaugesshouldbeperiodicallycalibrated.InflationpressureofatirevarieswiththeambienttemperaturebyaboutonepercentforeveryfivedegreesFahrenheit.2021/3/29星期一48GuangzhouCivilAivationCollege《AircraftSystem》InflationPressure1.Ifatireisinflatedandallowedtostabilizewithapressureof180psiinashopwherethetemperatureis70°F.2.Andtheairplaneisrolledoutsidewhereitremainsovernightwithatemperatureof0°F,thepressurewilldropby14%toabout155psi.3.Obviously,tirewouldthenbeseriouslyunder-inflatedandshouldbereinflatedto180psi.2021/3/29星期一49GuangzhouCivilAivationCollege《AircraftSystem》InflationPressureAnairplaneistoflyintoanareawherethetemperatureismuchlowerthanthatofthedepartingpoint.Theoretically,thepressureshouldbeadjustedbeforetheairplaneleaves.1.Thetemperatureatthedepartingairportis100°F.2.Theairplaneistolandattheanotherairportwherethetemperatureis40°F.3.Thepressureshouldbeincreasedbeforetakeoff.2021/3/29星期一50GuangzhouCivilAivationCollege《AircraftSystem》InflationPressure4.Ifthetirerequires187psi,the60°Ftemperaturedropwillrequirethepressuretobe12％greater,or210psi.Themaximumallowablesafe-inflationpressureinAMMcouldnotbeenexceeded.Nylontirewillstretchandincreasetheirvolumeenoughtocausepressuredropaftertheyarefirstinflated.Thepressuresshouldbeadjusted12to24hoursafterfirstinstallation.Conclusion:Every5°Ftemperaturedropwillrequiretheinflationpressuretobeincreased5％.2021/3/29星期一51GuangzhouCivilAivationCollege《AircraftSystem》Over-inflationItcausesmorecenterlinewearonthetreadthanthatontheshoulder.Whenatireisworninthisway,ithasmuchlessresistancetoskiddingthanwhenitstreadwearsuniformly.2021/3/29星期一52GuangzhouCivilAivationCollege《AircraftSystem》Over-inflation2021/3/29星期一53GuangzhouCivilAivationCollege《AircraftSystem》Under-inflation

ItcausesoverdeflectionExcessheatwithinthetire.(45%deflection,threetimesheatbuildsupintire)Treadwornawayontheshouldersmorethaninthecenter.Tiresshowingthispatternofwearshouldbecarefullyexaminedforevidenceofhiddendamage.2021/3/29星期一54GuangzhouCivilAivationCollege《AircraftSystem》Under-inflation2021/3/29星期一55GuangzhouCivilAivationCollege《AircraftSystem》TREADCONDITIONBasicstrengthofatireisdeterminedbyitscarcass,atirelosesnothingofitsstrengthaslongasthetreaddoesnotweardowntothebodyplies.Itshouldberemovedforretreadingwhilethereisstillatleast1/32-inchoftreadleftatitsmostshallowpoint.2021/3/29星期一56GuangzhouCivilAivationCollege《AircraftSystem》2021/3/29星期一57GuangzhouCivilAivationCollege《AircraftSystem》CorrectInflationPressureNormalWearThecorrectinflationpressurewillwearthetreaduniformly.[Figure9-76]2021/3/29星期一58GuangzhouCivilAivationCollege《AircraftSystem》2021/3/29星期一59GuangzhouCivilAivationCollege《AircraftSystem》AbnormalWearofTireTread1.UneventreadwearCause:thelandinggearisoutofalignment.Measures:Wheelalignmentshouldbecheckedsoitconformstothespecificationsoftheaircraftservicemanual.Iftheunevenwearisslightandthelandinggearisnotadjusted,thetiresmayberemoved,carefullyinspected,andreversedsothewearwillevenout.2021/3/29星期一60GuangzhouCivilAivationCollege《AircraftSystem》AbnormalWearofTireTread2TreadwearinspotsCause:malfunctioningbrakesimproperlytorquedbearingswornstrutpartslandingwithbrakesengaged.2021/3/29星期一61GuangzhouCivilAivationCollege《AircraftSystem》TreadcutAtireshouldberemovedformserviceifthetreadiscutacrossmorethanone-halfofaribwidthCause:glass,rock,ormetal[Figure9-80]groovedrunway[Figure9-82]Note:removeglass,rock,ormetalwithabluntawlorscrewdriver.2021/3/29星期一622021/3/29星期一632021/3/29星期一64GuangzhouCivilAivationCollege《AircraftSystem》TreadburnAtireshouldberemovedformserviceifthetreadshowstheburningmarkonthecontactpointwiththerunwayorwaterontherunway.[Figure9-81]Cause:hydroplaning(打滑）alockedbrake2021/3/29星期一652021/3/29星期一66GuangzhouCivilAivationCollege《AircraftSystem》InspectionofTread1.Ifthecordbodypliesarevisible,thetirecannotberetrodden.[Figure9-79]2.Ifthetreadreinforcementjustisshowing,thetiresarepossiblyretrodden.3.Anytimethetreadiscutmorethanhalfwayacrossarib，oranyofthecarcasspliesareexposed，thetireshouldberemovedfromservice．[Figure9-80]2021/3/29星期一672021/3/29星期一68GuangzhouCivilAivationCollege《AircraftSystem》InspectionofTread4.bitsofglass,rockormetalembeddedinthetreadshouldbecarefullyremovedwithabluntawlorasmallscrewdriver.5.Tiresshowingburnatthepointofcontactshouldberemovedfromservice.6.Operatingongroovedrunwayscancausechevron-shaped(V-shape)cutsacrosstheribsofatire.Iftheyextendacrossmorethanone-halfoftherib,thetireshouldberemovedfromservice.2021/3/29星期一69GuangzhouCivilAivationCollege《AircraftSystem》InspectionofTread7.Anydamagedorsuspectareaofthetireshouldbemarkedwithalight-coloredmarkerbeforedeflatingthetire.8.Anytreaddamageshouldbecarefullyevaluatedbyalicensedretreadingagencytodeterminewhetherornotthetireisrepairable.2021/3/29星期一70GuangzhouCivilAivationCollege《AircraftSystem》SidewallPurpose:Itprotectsthecarcasspliesfromdamage,eitherfrommechanicalabrasion,fromdeteriorationbychemicals，orbythesun.1.ifsmallsnags,cuts,weathercracksdon’texposethecords,thetireshouldnotberemovedformaintenance.2.Checkforopenholesonthesidewall.Theventisusedtorelievetheairdiffusedintothebodypliesfromthetirecompartmentinordertoprotectthepliesfromseparation.2021/3/29星期一71GuangzhouCivilAivationCollege《AircraftSystem》ProcedureofTireRemoval

1.jacktheaircraftup.2.whentheweightisoff,deflatethetireusingadeflatorcap.3.removedthecoverofinflationvalve.4.removethewheel.5.clean,inspectionandrepackthebearingswithpropergrease,protectitfromdamage.2021/3/29星期一72GuangzhouCivilAivationCollege《AircraftSystem》ProcedureofTireRemoval6.putthewheelonaflatsurface,thebeadseparatedfromthebeadseatareaofthewheelusingastraightpushasneartotherimaspossible.[Figure9-83]

Caution:Nokindoftiretoolshouldbeusedtoprythebeadfromthewheel,becausethewheelcanbecomenickedorscratched--stressconcentrationsatthepointofthenickorscratchthatcouldleadtowheelfailure.2021/3/29星期一732021/3/29星期一74GuangzhouCivilAivationCollege《AircraftSystem》ProcedureofTireRemoval8.removethewheelbolts,thenremovethewheelhalvesfromthetire.9.forthetubelesstire,theO-ringbetweenthewheelhalvesshouldbeinspectedfordamage.2021/3/29星期一75GuangzhouCivilAivationCollege《AircraftSystem》ReplacementofTire1.Abortedtake-off2.Severebrakes3.Thefusibleplughasmeltedandthetirewasdeflated.4.Ifonetireinadualinstallationfails,anotheroneshouldbereplacedatthesametime.2021/3/29星期一76GuangzhouCivilAivationCollege《AircraftSystem》InspectionofInnerLinercracksbulgesorblisters（凸起）Caution:1.beadshouldnotbespreadmorethanthesectionwidthofthetire.2.forceusedtospreadthebeadsshouldnotbeconcentratedinonearea.3.improperspreadingmethodcankink（纽结）thewirebundlesandthetiremustbescrapped.2021/3/29星期一77GuangzhouCivilAivationCollege《AircraftSystem》Inspectionofthemarkedarea1.inflatethetire2.cutsshouldbeopenedupenoughtocheckthedepth.3.Puncturesthatdonotexceedone-quarterinchontheoutsideofthetire,one-eighthinchontheinside,neverpuncturethetire.2021/3/29星期一78GuangzhouCivilAivationCollege《AircraftSystem》InspectionofBead&AdjacentArea1.Severedamagefromtiretoolsandchafingtherim.2.Damagefromexcessiveheatsuchasanunusualappearanceortexture.2021/3/29星期一79GuangzhouCivilAivationCollege《AircraftSystem》RejectionofTireThefollowingtiresmustbescraped:Anyevidenceofbreakscausedbyflexing（弯曲）.Thistypeofdamageisoftenassociatedwithotherdamagethatmaynotbevisible.Beaddamagetomorethanthechafers,oranydamagethatwouldpreventthebeadofatubelesstirefromsealingtothewheel.Anyevidenceofseparationbetweenthepliesaroundthebeadwire.

2021/3/29星期一80GuangzhouCivilAivationCollege《AircraftSystem》RejectionofTireThefollowingtiresmustbescraped:Anyinjurythatwouldrequireareinforcement.Kinkedorbrokenbeads.Weathercracksorradialcracksinthesidewallthatextendintothecordbody.Blistersorotherevidenceofheatdamage.Cracked,deteriorated,ordamagedinnerlinersoftubelesstires.

2021/3/29星期一81GuangzhouCivilAivationCollege《AircraftSystem》StorageofTireAllnewandretreadedtiresshouldbestoredinacool,dryarea,outofdirectsunlightandawayfromanyelectricalmachinery(Ozonedamage).Thetemperatureshouldbekeptbetween32°Fand80°F.Thetiresshouldbestoredverticallyinspecialrackswiththetiresupportedonaflatsurfacewhichisatleastthreeorfourincheswide.2021/3/29星期一82GuangzhouCivilAivationCollege《AircraftSystem》StorageofTireStacktirehorizontally:1.theyshouldnotbestackedmorethanfivetireshighfortireswithadiameterofupto40inches.2.notmorethanfourtireshighforthosewithadiameterbetween40and49inches.3.notmorethanthreehighfortireswithadiameterlargerthan49inches.[Figure9-84]2021/3/29星期一832021/3/29星期一84GuangzhouCivilAivationCollege《AircraftSystem》AircrafttubesTwotype:1.Unreinforcedrubbertubefornormalapplication.2.Specialheavy-dutyreinforcedtubeincludealayerofnylonfabricmoldedtoinsidecircumferencetoprotectitfromchafingagainsttherimandfromheatcausedbybrakeapplication.Material:aspeciallycompoundednaturalrubberLeakagecauses:Aholeordefectivevalve2021/3/29星期一85GuangzhouCivilAivationCollege《AircraftSystem》TubeInspectionLeakage:spreadadropofwaterovertheendofthevalvetocheckifthecoreisperfect.iftheleakisnotinthevalve,thetubemustberemoved,inflatedandputintoawatercontainertocheckforleakageasfollowing:2021/3/29星期一86GuangzhouCivilAivationCollege《AircraftSystem》TubeInspection1.wheninflatingatirethatisnotinatire,onlyenoughairisusedtorounditout.2.checktheareacarefullyaroundthevalvestemandthevalvepadforanyindicationofthepadpullingawayfromthetube.3.theinnercircumferenceofthetubeshouldbeexaminedforevidenceofchafingagainstthetoeofthebead.4.theinnercircumferenceofthetubeshouldbeexaminedforanyheatedindication.Ithaslostitssmooth,contour-developedsquarecorners.2021/3/29星期一87GuangzhouCivilAivationCollege《AircraftSystem》StorageofTubeTubesshouldbestoredinoriginalcartons.Theycanbedustedwithtiretalcum(滑石粉）

wrappedinheavypaperTubescanbestoredinthepropersizetirewithinflation.Inflationpressureisjustenoughtorounditout.Neverhangtubesovernailsorpegs.2021/3/29星期一88GuangzhouCivilAivationCollege《AircraftSystem》StorageofTubeDonotcauseanysharpfoldorcrease(摺痕，皱痕).Tubesshouldbestoredinacool,dry,darkareaawayfromanyelectricalequipment.Inspection:elasticity,cracking,evidenceofchafing.throughcheckofvalvestem,valvecoretightnessorleakage.checkforleaksbyinflationbeforeinstallation.2021/3/29星期一89GuangzhouCivilAivationCollege《AircraftSystem》MountingofTireM.S.Mmustbefollowedindetailwhenmountingandremovingatire.Suchas:bolttorquelubricationrequirementwheelbalancing2021/3/29星期一902021/3/29星期一912021/3/29星期一92GuangzhouCivilAivationCollege《AircraftSystem》MountingofTubelessTireInspectionbeforemounting:Nonicksorscratches（擦伤）inthebeadseatareaofthewheel.TheO-ringareaiscriticalfortubelesstire.(cleantheseareawithaclothdampenedwithisopropylalcohol异丙醇)NocorrosionoranyscratchedfinishonthewheelThermalfuseplugshouldbecheckedforsecurityandcondition.Theconditionoftheairvalve2021/3/29星期一93GuangzhouCivilAivationCollege《AircraftSystem》MountingofTubelessTireInspectionbeforemounting:Assurethattireisapprovedtype.ThereisnoF.Oinsidethetire.Thebeadareashouldbewipedcleanwitharagdampenedwithisopropylalcohol.TheO-ringshouldbelubricatedwiththesamegreaseusedforthewheelbearingandiscarefullyplacedinthegroovewithoutstretchingortwisting.2021/3/29星期一94GuangzhouCivilAivationCollege《AircraftSystem》MountingofTubelessTirePlacetheinboardwheelhalfonaclean,flatsurface.2.Thetireshouldthenbeplacedovertheinboardwheelhalfwiththereddotindicatingthetire’slightpointadjacenttothewheelvalve,orifsomeothermarkonthewheelidentifiesitsheavypoint,adjacenttothatmark.3.Theoutboardwheelhalfisplacedinsidethetire,theboltholesarelinedup.

2021/3/29星期一95GuangzhouCivilAivationCollege《AircraftSystem》MountingofTubelessTire4.Paintananti-seizecompound(防咬剂）suchasLubtorkonthethreadsofboltsandnuts,bothsidesofwashers,andtheninstallboltsandnuts.5.Allthenutsaredrawnupincrisscrossfashiontoone-halfoftherequiredtorque,thenallofthefastenersaretightenedtofulltorque.Note:Wheelboltsshouldonlybetightenedusingaaccuratehand-torquewrench.Neveruseaimpactwrenchnanyboltwherethetorqueiscritical.Aseriesofblowsorjerkscreatestressesgreaterthantheboltisdesignatedtotake.2021/3/29星期一96GuangzhouCivilAivationCollege《AircraftSystem》MountingofTubelessTire6.Thewheelandtireassemblyshouldbeplacedinasafetycage,theairpressureregulatorisadjustedtotherecommendedtirepressure,and