《AircraftSystem》AircraftTiresGuangzhouCivilAivationCollege《AircraftSystem》ClassificationofTiresTypeSizePlyrating(層數(shù)）

TubeortubelessGuangzhouCivilAivationCollege《AircraftSystem》ClassificationofTiresTypeⅢtireCharacteristic:

Lowpressure,piston-poweraircraft.Constructioncharacter:Thesectionwidthisrelativelywideinrelationtothebeaddiameter.DesignatingMethod:Sectionwidthandrimdiameter9.50-16tire:thesectionwidthis9.5inches,therimdiameteris16inches.GuangzhouCivilAivationCollege《AircraftSystem》GuangzhouCivilAivationCollege《AircraftSystem》GuangzhouCivilAivationCollege《AircraftSystem》ClassificationofTiresTypeⅦtireCharacteristic:

Extra-highpressure,jetaircraft.Constructioncharacter:

Plyratingfrom4to38.DesignatingMethod:Outsidediameterandsectionwidth38×13tire:Theoutsidediameteris38inches,thesectionwidthis13inches.GuangzhouCivilAivationCollege《AircraftSystem》GuangzhouCivilAivationCollege《AircraftSystem》GuangzhouCivilAivationCollege《AircraftSystem》ClassificationofTiresTypeⅧtireCharacteristic:Jetaircraft，highload-carryingability,Plyrating:4to38Constructioncharacter:Lowprofile.DesignatingMethod:Outsidediameter,sectionwidthandrimdiameter.30×11.50-14.5tire:Theoutsidediameteris30inches,Thesectionwidthis11.50inches,Therimdiameteris14.5inches.GuangzhouCivilAivationCollege《AircraftSystem》ClassificationofTiresDesignatingMethod:ATypeVIIIorthree-partnomenclaturetireisidentifiedby3parameters:overalldiameter,sectionwidth,andrimdiameter.Theyarearrangedinthatorderwiththefirsttwoseparatedbyan“X”andthesecondtwoseparatedbya“–.”Forexample:18X4.25—10designatesatirethatis18inchesindiameterwitha4.25-inchsectionwidthtobemountedona10-inchwheelrim.GuangzhouCivilAivationCollege《AircraftSystem》GuangzhouCivilAivationCollege《AircraftSystem》BiasorRadialTireAnothermeansofclassifyinganaircrafttireisbythedirectionofthepliesusedinconstructionofthetire,eitherbiasorradial.Traditionalaircrafttiresarebiasplytires.Thepliesarewrappedtoformthetireandgiveitstrength.Theangleofthepliesinrelationtothedirectionofrotationofthetirevariesbetween30°and60°.GuangzhouCivilAivationCollege《AircraftSystem》BiasorRadialTireInthismanner,theplieshavethebiasofthefabricfromwhichtheyareconstructedfacingthedirectionofrotationandacrossthetire.Hence,theyarecalledbiastires.Theresultisflexibilityasthesidewallcanflexwiththefabricplieslaidonthebias.GuangzhouCivilAivationCollege《AircraftSystem》GuangzhouCivilAivationCollege《AircraftSystem》PlyRatingItisjustastrengthindexbutinthepast.Tiresaregivenaplyrating,ratherthanspecifyingtheactualnumberoflayersoffabricmaterialusedinthecarcass.Theplyratingofatirerelatestoitsmaximumstaticloadanditsinflationpressure.GuangzhouCivilAivationCollege《AircraftSystem》TubeorTubelessTiresTubelesstires:one-tenthofaninchthickinnerliner“TUBELESS”onthesidewallTubetires:noinnerliner,smootherinsidesurface.no“identification”onthesidewallGuangzhouCivilAivationCollege《AircraftSystem》ConstructionofTireAutomobileandtrucktires1.differentspecificationsfromthoseusedforaircrafttires.2.tooperateforlongperiodsoftime.3.arelativelylargebutsteadyloadatreasonablyhighrotationalspeeds．4.arelativelysmallamountofdeflection（變形）.CarTires:acontinualdeflectionofonlyabout12to14%.GuangzhouCivilAivationCollege《AircraftSystem》ConstructionofTireAirplanetires1.strongenoughtoabsorbthetremendousloadsexertedonthemattouchdown.2.theymustoperateatveryhighspeeds.3.thegroundrolldurationislimited.4.adeflectionofbetween32and35%,morethantwicethatallowedforautomobiletiresGuangzhouCivilAivationCollege《AircraftSystem》BEAD（胎緣）Thebeadsaremadeofbundlesofhigh-strengthcarbon-steelwire,withone,two,orthreeofthesebundlesusedineachsideofthetire.Themostimportantpartofatire.Toprovidesafirmmountingsurfaceforthetireonthewheel.Allofthegroundforcesonthetireterminateinthebead.[Figure9-71]GuangzhouCivilAivationCollege《AircraftSystem》RubberApexStrips(橡膠填充層)Definition:Topackandstreamlinetheroundbeadbundles,sothefabricwillfitsmoothlyaroundthemwithnovoids.GuangzhouCivilAivationCollege《AircraftSystem》Flippers（隔離層）Definition:Layersofrubberandfabricenclosethebeadbundlestoinsulatethecarcasspliesfromthebeadwires.Function:Becausethegreatestamountofheatinthetireisconcentratedinthebeadarea,thisinsulationincreasesthedurabilityofthetire.GuangzhouCivilAivationCollege《AircraftSystem》CARCASSandTURN-UPS（胎體和重疊層）layersorpliesofrubber-coatednylon-cordfabric.thecordsofthefabricatanangleofapproximately450tothelengthofthestrip．thestripsextendcompletelyacrossthetireandlapbackoverthebeadstoformtheplyturn-ups.eachsuccessiveplyofthefabricisplacedinsuchawaythatthecordscrosseachotheratapproximately900tobalancethestrengthofthecarcass.GuangzhouCivilAivationCollege《AircraftSystem》CHAFERS

（胎緣包覆層）Definition:Layersoffabricandrubberwraparoundtheedgesofthecarcasspliesandenclosetheentirebeadarea.Function:Theyprovidechaferesistancebetweenthebeadandthewheel.GuangzhouCivilAivationCollege《AircraftSystem》UNDERTREAD（底胎面）Definition:Apliesofspeciallycompoundedrubberplacedoverthecarcass’.Function:Toprovidegoodadhesionbetweenthetreadandthecarcass.GuangzhouCivilAivationCollege《AircraftSystem》TREADREINFORCINGLAYER（胎面加強層）Definition:Oneormorepliesofnylonfabricstrengthensthetread.Function:1.toopposesthecentrifugalforcesthattrytopullthetreadfromthecarcassduringhigh-speedoperation.GuangzhouCivilAivationCollege《AircraftSystem》TREADREINFORCINGLAYER

（胎面加強層）2.Italsostabilizesthetreadonthecordbodyandpreventsitfromsquirming（蠕動)ormoving.3.Thisreinforcementdoesnotenterintotheplyratingofthetire,butitisusedasaguidefortheretreaderwhenbuffingthetiretoremovethetread.GuangzhouCivilAivationCollege《AircraftSystem》TUBELESSTIRELINER（無內(nèi)胎輪胎襯層）Definition:Aspecialcompoundofrubberthatislesspermeablethantherubberusedintherestofthetire.athincoatingofrubberovertheinnerplycordsprotectsthelinerfromchafing.Function:Thelineractsasacontainerfortheairandminimizestheamountofairthatseepsoutthroughthecasingplies.GuangzhouCivilAivationCollege《AircraftSystem》TREAD（胎面）Definition:Thewearingsurfaceontheoutercircumferenceofthetire.Characteristic:1.Itismadeofspeciallycompoundedrubber.2.Apatternofgroovesmoldedintoitssurfacetogivethetiretherequiredtraction(附著力）accordingtothetypeofrunwaysurfacetheaircraftwillencounter.GuangzhouCivilAivationCollege《AircraftSystem》GuangzhouCivilAivationCollege《AircraftSystem》TREADPATTERNSPlainTreadPlain,orsmooth,treadisusedonsomehelicopterandonverylightairplanes.Allweathertread1.All-weathertreadshavearibtreadinthecenteranddiamondsmoldedintotheshoulders．2.Thediamond-shapedtreadpatterniseffectiveforaircraftoperatingongrassorhard-packeddirt,andtheribtreadinthecentergivesgoodtractiononhardsurfacedrunways．【Figure9-72』GuangzhouCivilAivationCollege《AircraftSystem》RibTreadTheribtreadisthemostpopulartreadpatternfoundonmodernaircrafttoday.1.useonhard-surfacedrunways.2.longtreadwearlife3.goodtraction4.exceptionallygooddirectionalstability.[Figure9-73]Thewidthanddepthofthegrooves,theirplacementonthetreadaredeterminedbyoperatingconditionsofaircraftforwhichtheyaredesigned.GuangzhouCivilAivationCollege《AircraftSystem》CHINE(胎脊、偏轉器）Chinesordeflectorsmoldedintotheuppersidewalloftireonthenosewheel.Tiresfordualnosewheelinstallationshavechinesononesideonly,Singlenosewheelinstallationshavedualchines(deflectors)，oneoneithersideofthetire．[Figure9-74]Function:Topreventwaterorslushfrombeingthrownupbythenosewheelandenteringtheengines，[Figure9-74]GuangzhouCivilAivationCollege《AircraftSystem》SIDEWALLDefinition:ArubbercoveringthatextendsfromthetreaddowntothebeadheelFunction:Toprotectthecarcassfrominjuriessuchascutsorbruisesandfromexposuretomoistureandozone.GuangzhouCivilAivationCollege《AircraftSystem》VENTHOLESDefinition:Ventholesinthelowersidewalltoallowtheairseepingintosidewalltoescape.Theseholesaremarkedwithpaintandmustbekeptopenwhenthetireisretreaded.Function:Whenthetirewasheated,toavoidplyseparationandthetreadtobethrownfromthetire.GuangzhouCivilAivationCollege《AircraftSystem》TIREINSPECTIONONTHEAIRCRAFTMostinspectionontheaircraftScheduledinspectionsofthetiresThetechnicianshouldtakealookatthetiresanytimeworkisbeingdoneinthevicinityofthegear.GuangzhouCivilAivationCollege《AircraftSystem》輪胎充氣旳基本要求1.假如將輪胎一直維持在正確壓力，輪胎壽命會更長。2.假如用干燥旳空氣給輪胎充氣，確保氧氣含量不超出5%。3.假如輪胎壓力比正確壓力低5%或更低，則為輪胎充氣。4.假如輪胎壓力比正常壓力低5%—15%，給輪胎充氣并在24小時后檢驗。5.假如輪胎壓力比正常壓力低15—30%，拆卸并更換機輪和輪胎組件。6.假如輪胎壓力比正常壓力低超出30%，拆卸并更換機輪和輪胎組件。假如輪胎在壓力下降后機輪轉動并承擔飛機重量，更換安裝在輪軸對側旳機輪和輪胎組件。GuangzhouCivilAivationCollege《AircraftSystem》HeatDamageThegreatestenemyofanaircrafttireisheat.Heatresource:1.Theheatgeneratedwithinthetireasitrollsovertheground,thesidewallsflexandcauseinternalheat2.Theheatfromexternalsourcessuchasthebrakesorhotrunwaysurfaces.GuangzhouCivilAivationCollege《AircraftSystem》InflationPressure1.ThepressureshouldbecheckedDailyinspectionPreflightinspection2.Differencesinairpressurebetweendualmountedtiresshouldcauseconcern.Itdefeatsthepurposeofdualmountedtires3.Anypressuredifferenceshouldbecorrectedandnotedintheaircraftlogbook.Consulttheaircraftservicemanualtodeterminetheexacttirepressuretolerances.GuangzhouCivilAivationCollege《AircraftSystem》InflationPressureInflationpressureshouldalwaysbemeasuredwhenthetireiscold.Twotothreehoursshouldelapseafteraflightorbeforethepressureismeasured.Tirepressurecheckisthemostimportantpartsofroutinepreventivemaintenance.Thepressureintheaircraftservicemanual,ratherthanthatlistedinthetiremanufacturer'sproductmanuals.

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

ItcausesoverdeflectionExcessheatwithinthetire.(45%deflection,threetimesheatbuildsupintire)Treadwornawayontheshouldersmorethaninthecenter.Tiresshowingthispatternofwearshouldbecarefullyexaminedforevidenceofhiddendamage.GuangzhouCivilAivationCollege《AircraftSystem》Under-inflationGuangzhouCivilAivationCollege《AircraftSystem》TREADCONDITIONBasicstrengthofatireisdeterminedbyitscarcass,atirelosesnothingofitsstrengthaslongasthetreaddoesnotweardowntothebodyplies.Itshouldberemovedforretreadingwhilethereisstillatleast1/32-inchoftreadleftatitsmostshallowpoint.GuangzhouCivilAivationCollege《AircraftSystem》GuangzhouCivilAivationCollege《AircraftSystem》CorrectInflationPressureNormalWearThecorrectinflationpressurewillwearthetreaduniformly.[Figure9-76]GuangzhouCivilAivationCollege《AircraftSystem》GuangzhouCivilAivationCollege《AircraftSystem》AbnormalWearofTireTread1.UneventreadwearCause:thelandinggearisoutofalignment.Measures:Wheelalignmentshouldbecheckedsoitconformstothespecificationsoftheaircraftservicemanual.Iftheunevenwearisslightandthelandinggearisnotadjusted,thetiresmayberemoved,carefullyinspected,andreversedsothewearwillevenout.GuangzhouCivilAivationCollege《AircraftSystem》AbnormalWearofTireTread2TreadwearinspotsCause:malfunctioningbrakesimproperlytorquedbearingswornstrutpartslandingwithbrakesengaged.GuangzhouCivilAivationCollege《AircraftSystem》TreadcutAtireshouldberemovedformserviceifthetreadiscutacrossmorethanone-halfofaribwidthCause:glass,rock,ormetal[Figure9-80]groovedrunway[Figure9-82]Note:removeglass,rock,ormetalwithabluntawlorscrewdriver.GuangzhouCivilAivationCollege《AircraftSystem》TreadburnAtireshouldberemovedformserviceifthetreadshowstheburningmarkonthecontactpointwiththerunwayorwaterontherunway.[Figure9-81]Cause:hydroplaning(打滑）alockedbrakeGuangzhouCivilAivationCollege《AircraftSystem》InspectionofTread1.Ifthecordbodypliesarevisible,thetirecannotberetrodden.[Figure9-79]2.Ifthetreadreinforcementjustisshowing,thetiresarepossiblyretrodden.3.Anytimethetreadiscutmorethanhalfwayacrossarib，oranyofthecarcasspliesareexposed，thetireshouldberemovedfromservice．[Figure9-80]GuangzhouCivilAivationCollege《AircraftSystem》InspectionofTread4.bitsofglass,rockormetalembeddedinthetreadshouldbecarefullyremovedwithabluntawlorasmallscrewdriver.5.Tiresshowingburnatthepointofcontactshouldberemovedfromservice.6.Operatingongroovedrunwayscancausechevron-shaped(V-shape)cutsacrosstheribsofatire.Iftheyextendacrossmorethanone-halfoftherib,thetireshouldberemovedfromservice.GuangzhouCivilAivationCollege《AircraftSystem》InspectionofTread7.Anydamagedorsuspectareaofthetireshouldbemarkedwithalight-coloredmarkerbeforedeflatingthetire.8.Anytreaddamageshouldbecarefullyevaluatedbyalicensedretreadingagencytodeterminewhetherornotthetireisrepairable.GuangzhouCivilAivationCollege《AircraftSystem》SidewallPurpose:Itprotectsthecarcasspliesfromdamage,eitherfrommechanicalabrasion,fromdeteriorationbychemicals，orbythesun.1.ifsmallsnags,cuts,weathercracksdon’texposethecords,thetireshouldnotberemovedformaintenance.2.Checkforopenholesonthesidewall.Theventisusedtorelievetheairdiffusedintothebodypliesfromthetirecompartmentinordertoprotectthepliesfromseparation.GuangzhouCivilAivationCollege《AircraftSystem》ProcedureofTireRemoval

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

Caution:Nokindoftiretoolshouldbeusedtoprythebeadfromthewheel,becausethewheelcanbecomenickedorscratched--stressconcentrationsatthepointofthenickorscratchthatcouldleadtowheelfailure.GuangzhouCivilAivationCollege《AircraftSystem》ProcedureofTireRemoval8.removethewheelbolts,thenremovethewheelhalvesfromthetire.9.forthetubelesstire,theO-ringbetweenthewheelhalvesshouldbeinspectedfordamage.GuangzhouCivilAivationCollege《AircraftSystem》ReplacementofTire1.Abortedtake-off2.Severebrakes3.Thefusibleplughasmeltedandthetirewasdeflated.4.Ifonetireinadualinstallationfails,anotheroneshouldbereplacedatthesametime.GuangzhouCivilAivationCollege《AircraftSystem》InspectionofInnerLinercracksbulgesorblisters（凸起）Caution:1.beadshouldnotbespreadmorethanthesectionwidthofthetire.2.forceusedtospreadthebeadsshouldnotbeconcentratedinonearea.3.improperspreadingmethodcankink（紐結）thewirebundlesandthetiremustbescrapped.GuangzhouCivilAivationCollege《AircraftSystem》Inspectionofthemarkedarea1.inflatethetire2.cutsshouldbeopenedupenoughtocheckthedepth.3.Puncturesthatdonotexceedone-quarterinchontheoutsideofthetire,one-eighthinchontheinside,neverpuncturethetire.GuangzhouCivilAivationCollege《AircraftSystem》InspectionofBead&AdjacentArea1.Severedamagefromtiretoolsandchafingtherim.2.Damagefromexcessiveheatsuchasanunusualappearanceortexture.GuangzhouCivilAivationCollege《AircraftSystem》RejectionofTireThefollowingtiresmustbescraped:Anyevidenceofbreakscausedbyflexing（彎曲）.Thistypeofdamageisoftenassociatedwithotherdamagethatmaynotbevisible.Beaddamagetomorethanthechafers,oranydamagethatwouldpreventthebeadofatubelesstirefromsealingtothewheel.Anyevidenceofseparationbetweenthepliesaroundthebeadwire.

GuangzhouCivilAivationCollege《AircraftSystem》RejectionofTireThefollowingtiresmustbescraped:Anyinjurythatwouldrequireareinforcement.Kinkedorbrokenbeads.Weathercracksorradialcracksinthesidewallthatextendintothecordbody.Blistersorotherevidenceofheatdamage.Cracked,deteriorated,ordamagedinnerlinersoftubelesstires.

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

wrappedinheavypaperTubescanbestoredinthepropersizetirewithinflation.Inflationpressureisjustenoughtorounditout.Neverhangtubesovernailsorpegs.GuangzhouCivilAivationCollege《AircraftSystem》StorageofTubeDonotcauseanysharpfoldorcrease(摺痕，皺痕).Tubesshouldbestoredinacool,dry,darkareaawayfromanyelectricalequipment.Inspection:elasticity,cracking,evidenceofchafing.throughcheckofvalvestem,valvecoretightnessorleakage.checkforleaksbyinflationbeforeinstallation.GuangzhouCivilAivationCollege《AircraftSystem》MountingofTireM.S.Mmustbefollowedindetailwhenmountingandremovingatire.Suchas:bolttorquelubricationrequirementwheelbalancingGuangzhouCivilAivationCollege《AircraftSystem》MountingofTubelessTireInspectionbeforemounting:Nonicksorscratches（擦傷）inthebeadseatareaofthewheel.TheO-ringareaiscriticalfortubelesstire.(cleantheseareawithaclothdampenedwithisopropylalcohol異丙醇)NocorrosionoranyscratchedfinishonthewheelThermalfuseplugshouldbecheckedforsecurityandcondition.TheconditionoftheairvalveGuangzhouCivilAivationCollege《AircraftSystem》MountingofTubelessTireInspectionbeforemounting:Assurethattireisapprovedtype.ThereisnoF.Oinsidethetire.Thebeadareashouldbewipedcleanwitharagdampenedwithisopropylalcohol.TheO-ringshouldbelubricatedwiththesamegreaseusedforthewheelbearingandiscarefullyplacedinthegroovewithoutstretchingortwisting.GuangzhouCivilAivationCollege《AircraftSystem》MountingofTubelessTirePlacetheinboardwheelhalfonaclean,flatsurface.2.Thetireshouldthenbeplacedovertheinboardwheelhalfwiththereddotindicatingthetire’slightpointadjacenttothewheelvalve,orifsomeothermarkonthewheelidentifiesitsheavypoint,adjacenttothatmark.3.Theoutboardwheelhalfisplacedinsidethetire,theboltholesarelinedup.

GuangzhouCivilAivationCollege《AircraftSystem》MountingofTubelessTire4.Paintananti-seizecompound(防咬劑）suchasLubtorkonthethreadsofboltsandnuts,bothsidesofwashers,andtheninstallboltsandnuts.5.Allthenutsaredrawnupincrisscrossfashiontoone-halfoftherequiredtorque,thenallofthefastenersaretightenedtofulltorque.Note:Wheelboltsshouldonlybetightenedusingaaccuratehand-torquewrench.Neveruseaimpactwrenchnanyboltwherethetorqueiscritical.Aseriesofblowsorjerkscreatestressesgreaterthantheboltisdesignatedtotake.GuangzhouCivilAivationCollege《AircraftSystem》MountingofTubelessTire6.Thewheelandtireassemblyshouldbeplacedinasafetycage,theairpressureregulatorisadjustedtotherecommendedtirepressure,andtheninflatethetiregradually.Thetechnicianshouldwatchthetiretobesurethebeadseatsagainstthewheelflange.7.Allnylontiresstretchwhentheyareinitiallyinflatedandshouldbeallowedtoremainfor12to24hourswithnoloadapplied.Thepressureshouldbeadjustedafterthisperiod.8.Continuetomonitortheinflationpressurelossdaily,butitshouldnotexceed5%inany24-hourperiod.GuangzhouCivilAivationCollege《AircraftSystem》MountingofTubeTire1.Thetireandtubemustbecorrectforinstallation.2.Anydamageorcorrosionofthewheelshouldbetreated.Corrosion--Removalofdamagetrace–restoringoxidefilm–Twocoatsofzincchromateprimer–finishshouldberestoredtomatchtheresttomatchtherestofthewheel.3.Wipethebeadseatareawitharagdampenedwithisopropylalcoholbeforemounting.GuangzhouCivilAivationCollege《AircraftSystem》MountingofTubeTire4.Theinsideofthetiremustbecleanand