航空英语证书考试(pec)-飞行器术语

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1、航空英语证书考试(PEC)-飞行器术语Abort-Earlymissionterminationduetofailure(s)thatprecludemissioncontinuation.ReturntoEarthofthecrewisaccomplishedinsidethespacecraftdesignedforEarthreturnandlanding(seeAborttoEarth,AborttoOrbit).AborttoEarth-Earlymissiontermination,withdirectreturntotheEarth'ssurfaceast

2、heimmediateobjective.AborttoOrbit-Anearlymissionterminationthathasanimmediateobjectiveofplacingtheflightsystem(CEV)inEarthorbit,priortoreturntotheEarth'ssurface.AcceptanceTests-Testsconductedtoverifythathardwaredeliveredtohigher-levelassemblypriortodeliverytotheflighttestandpriortodelive

3、rytotheoperationalinventoryorforoperationalsparesconformstoprogramrequirements.Acceptancetestingalsoincludesfinal"sell-off"ofthefullyassembledCEV.Annunciate-Toprovideavisual,tactileoraudibleindication.Ascent-ThetimefromliftofffromtheEarth'ssurface,tospacecraftinsertionintoEarthorbit.Asce

4、ntAbort-Earlymissionterminationduetofailure(s)thatprecludemissioncontinuation.ReturntoEarthofthecrewisaccomplishedinsidethespacecraftdesignedforEarthreturnandlanding.AttitudeandPointingConstraints-Constraints,restrictionsorrequirementsonthevehiclesorientationinspace.Thesemayincludethings

5、suchasrequirementstoorientasensorataspecifictarget(suchasaspecificstar),oraconstraintlimitingtheamountoftimeavehicleaxiscanbeorientedtowardaparticulartarget(suchasthesun,ordeepspace).Theyalsoincludeconstraintsorrestrictionsonmaneuverratesandattitudedeadbands.Automatedcontrol-Automatic,as

6、opposedtohumanoperationorcontrolofaprocess,equipmentorasystem;orthetechniquesandequipmentusedtoachievethis.Automationisthecontrolorexecutionofactionswithnohumaninteraction.Automatedcontroldoesnotexcludethecapabilityformanualintervention/commanding,butmanualintervention/commandingisexplic

7、itlynotrequiredtoaccomplishthefunction.Autonomousoperations-Definedasaflightvehicleoperatingindependentofexternalcommandsorcontrol(i.e.,commandsfrommissioncontrolonEarth).Autonomousoperationscanbefullyautomatedorrequiresomedegreeofmanualcommanding/interventionbytheonboard