《英汉民航词典》

BOEINGCOMMERCIALAIRPLANEGROUP

A

ABEAM(ABM),Beside:Anaircraftisabeamastation

whenthatstationis90°totherightorleftofthetrackof

theaircraft.

90

ABSOLUTEALTITUDE,Theactualdistancetheaircraft

isabovetheground.

ABSOLUTEPRESSURE,Pressureofaliquidorgas

measuredrelativetoavacuum.

ACARS,SEE-AIRCRAFT(ORARINC)REPORTING

ADDRESSINGANDCOMMUNICATIONSYSTEM

AircraftorARINCReportingAddressingand

CommunicationSystem

ACCELERATION,Therateofchangeinvelocitywith

respecttotime.

ACCESSORYGEARBOX,Apartoftheengine,

mechanicallydrivenbyacompressororanangle

gearbox,fordrivingcomponentsnecessaryforengine

andairplaneoperations.

TECHNICALDICTIONARY

ACCUMULATOR(NO.1),Acontainerwithhydraulic

fluidpressurizedbydryairornitrogenforoperationof

componentswhennormalhydraulicsupplyisnot

available.

NO1

ACCUMULATOR(NO.2),Inacomputer,aspecial

storageregisterassociatedwiththearithmeticlogicunit,

usedforholdingtheresultsofacomputationordata

transfer.

NO2

ACMS,SEE-AIRCRAFTCONDITIONMONITORING

SYSTEM

AircraftConditionMonitoringSystem

ACTUATOR,Amechanicaldeviceoperatedelectrically,

hydraulically,pneumaticallyormechanicallyfor

transmittingmotionbetweencomponents.

ADC,SEE-AIRDATACOMPUTER

AirDataComputer

ADF,SEE-AUTOMATICDIRECTIONFINDER

AutomaticDirectionFinder

ADI,AttitudeDirectionIndicator,Anelectronicdisplayof

airplaneattitudeinformationinpitchandroll.

TECHNICALDICTIONARY

AERONAUTICALRADIOINCORPORATED,ARINCis

acorporationwhoseprincipalstockholdersareUnited

Statesscheduledairlines,airtransportcompanies,

aircraftmanufacturers,andforeignflagairlines.ARINC

developsandpublishesstandardsforelectronic

equipmentandsystems.

AGILITYTUNING,ThecapabilityoftheDMEto

alternatelytunebetweentwodifferentDMEstationsin

ordertogettwodistancereadingsfromone

interrogator.

DME

DME

AILERON,Ahingedmoveablepartonthetrailingedge

ofeachwingforairplaneroll(wingupandwingdown)

control.

AILERONFORCELIMITER,Anelectro-mechanical

deviceforlimitingthecontrolwheelmovementbythe

autopilotduringautopilotoperation.

AIRCLEANER,Acomponentinthepneumaticsystem

forremovingdirtfromtheengineairsupplytotheair

conditioningsystem.

TECHNICALDICTIONARY

AIRPORTELEVATION/FIELDELEVATION,The

highestpointofanairport'susablerunwaysmeasured

infeetfrommeansealevel.Inafewcountries,the

airportelevationisdeterminedattheairportreference

point.

AIRROUTETRAFFICCONTROLCENTER(ARTCC),

Afacilityestablishedtoprovideairtrafficcontrolservice

toaircraftoperatingonIFRflightplanswithincontrolled

airspaceandprincipallyduringtheenroutephaseof

flight.

ARTCC

AIRTRAFFICCONTROL(ATC),Aserviceoperatedby

appropriateauthoritytopromotethesafe,orderlyand

expeditiousflowofairtraffic.

ATC

AIRCYCLEMACHINE,Acompressorandturbineona

commonshaftforcoolingtheairinanairconditioning

system.Theairiscooledbyexpansionfromhightolow

pressureacrosstheturbine.Thecompressorisdriven

bytheturbine.

TECHNICALDICTIONARY

AIRDATACOMPUTER,Acomputerwhichproducesair

datainformation,suchasaltitudeandairspeed,based

onpressureandtemperaturemeasurements.

AIRTRAFFICCONTROL,Asystemcomprisedof

groundandairbornecomponentsusedtoidentify,track

andlocateaircraft.

AIR/GROUNDSENSOR,Anelectricaldeviceoperated

bythelandinggear,whichtransmitsonground/inair

informationforsystemoperationinflightoronthe

ground.

AIRBORNEVIBRATIONMONITOR,TheAVMtakes

thesignalfromtheenginemountedaccelerometerand

calculatesthevibrationonthatengine.

AVM

AVM

AIRWAY,Acontrolareaorportionthereofestablished

intheformofacorridorequippedwithradionavigation

aids.

AIRCRAFT(orARINC)COMMUNICATIONS

ADDRESSINGANDREPORTINGSYSTEM,An

addressabledigitaldatalinksystemwhichpermitsthe

exchangeofdataandmessagesbetweenanaircraft

andaground-basedoperationscenteroveraradio

network.

AIRCRAFTCONDITIONMONITORINGSYSTEM,A

systemofsensorsandrecorderstomonitorvarious

airplanesystems'performanceandstatus.

TECHNICALDICTIONARY

AIRFOIL,Asurfacedesignedtoobtainausefulreaction,

suchaslift,fromtheairthroughwhichitmoves.Wings,

stabilizersandcontrolsurfacesareairfoils.

AIRSPEED(IDS,TDS),Thespeedoftheairplane

throughtheair.

AIRSPEEDINDEX,Anadjustablepointeronthe

airspeedindicator.

AIRWORTHINESS,Theconditionoftheaircraftwith

respecttoitsaerodynamic,mechanical,andlegalability

tofly.

ALGORITHM,Astep-by-stepprocedureforsolvinga

problem,forexample,theprocedureforfindingthe

squarerootofanumber.

AIRPLANEFLIGHTMANUAL(AFM),Thelegal

documentcontainingperformanceandoperatinglimits,

operatingprocedures,andtakeoffandlanding

performance.

AFM

AIRPORTANALYSIS,Acomprehensivesetoftakeoff

weightlimitationsforagivenairportrunway,generally

presentedasafunctionofairporttemperature,wind,

andaircraftflapsetting.

TECHNICALDICTIONARY

AIRSPEEDBUGS,Adjustablepointersontheairspeed

indicator.

ALLOY,Amixtureofabasicmetalandsmallamounts

ofothermetalstochangethepropertiesofthebasic

metal.

ALPHASPEED,Minimumairplanespeed.

ALPHAVANE,Asmallmoveableairfoilonthesideof

thefuselagetransmittingairplaneanglerelativeto

airstreamforthestallwarningsystem.

ALTERNATE,Tochangefromoneconditiontoanother.

ALTERNATE,Anadditionalairportselectedduring

flightplanning,usuallynearthedestinationairport,tobe

usedwhenitisdesirabletodivertfromtheoriginal

destinationairport.

TECHNICALDICTIONARY

ALTERNATEAERODROME,Anaerodrometowhich

anaircraftmayproceedwhenitbecomeseither

impossibleorinadvisabletoproceedtoorlandatthe

aerodromeofintendedlanding.

ALTIMETERSETTING,Theadjustmentofthealtimeter

toaccountforlocalvariationsinatmosphericpressure.

ALTITUDEACQUIRE,Adigitalflightcontrolsystem

modetotransitionfromclimb(ordescend)tolevelflight.

ALTITUDEALERT,Aflightdeckalertoccuringwhenthe

airplaneapproachesordepartsaselectedaltitude.

ALTITUDECAPABILITY,Themaximumaltitudeat

whichtheairplanecanbeflownatforagiventhrust,

speedandatmospherecondition.

ALTITUDEHOLD(ALTHOLD),Amodeoftheautopilot

orflightdirectortomaintainaselectedaltitude.

ALTHOLD

ALTITUDEINTERVENTION,Pilotcontrolofthe

airplane'saltitudeduringVNAVoperation.

AMBIENT,Thesurroundingatmosphere.

TECHNICALDICTIONARY

AMBIENTPRESSURE,Pressureofairsurroundingan

object,measuredinpoundspersquareinch(psi).

psi

AMBIENTTEMPERATURE,Temperatureofair

surroundinganobject,measuredindegreesCelsius

(°C)ordegreesFahrenheit(°F).

°C

°F

AMPERE,Aunitofelectricalcurrent.Onevoltacross

oneohmofresistancecausescurrentflowofone

ampere.

1

1

1

AMPLITUDE,Thesizeormagnitudeofavoltageor

currentwaveform.

ANALOG,Quantitiesorrepresentationsthatare

variableoveracontinuousrange.

ANALOG-TO-DIGITAL,Theprocessofconvertingan

analogsignaltoadigitalsignal.

ANDGATE,Adeviceorcircuitwithtwoormoreinputs

ofbinarydigitalinformationandoneoutput.Theoutput

is1onlywhenalloftheinputsare1.Theoutputis0

whenanyoneormoreinputsare0.

1

1

0

0

TECHNICALDICTIONARY

ANEROID,Asealedflexibledevicecontainingairatlow

pressure,whichexpandsorcontractsduringchangeof

pressureoutsidethedevice.

ANGLEGEARBOX,Apartofanengine,mechanically

drivenbythecompressor,whichdrivestheaccessory

gearbox.Amechanicaldeviceforchangingthedirection

ofdrive.

ANGLEOFATTACK,Theangleofthewingchordin

relationtothefreestreamairflowasitmovesforward

throughtheair.

ANGLEOFINCIDENCE,Theacuteanglewhichthe

wingchordmakeswiththelongitudinalaxisofthe

aircraft.

TECHNICALDICTIONARY

ANNUNCIATIONS,Audioorvisualindicationsusedto

callattentiontoaneventthathastakenplace.

ANNUNCIATOR,Avisualdeviceconsistingofanumber

oflights.Eachlightindicatestheconditionwhichexists

orhasexistedinanassociatedcircuitandislabeled

accordingly.

ANODE,Theelementtowardwhichtheprincipalstream

ofelectronsflows.

ANOMALY,Notnormal.

ANTENNA,Adevicewhich,usedinconjunctionwitha

transmitterorreceiver,isusedforradiatingorreceiving

radiowaves.

ANTI-ICING,Amethodofpreventingiceformationon

thewingleadingedgesandenginenacelles.

ANTI-SKID,Asystemforprovidingmaximumbraking

withoutskiddingforanyrunwaycondition.Anti-skid

componentsarepartofthebrakesystem.

TECHNICALDICTIONARY

APPENDIX,AsupplementtotheAirplaneFlightManual

containingadditionalperformanceforaircraft

configurationsnotcontainedinthebasicmanual.A

collectionofsupplementarymaterialattheendofa

book.

APEXPIN,Apinforjoiningthetwosectionsofthe

torsionlinkonthelandinggear.

APPROACHMODE,Anautopilot/flightdirectormode

whichisacombinationoflocalizerforrollcontroland

glideslopeforpitchcontrol.Thismodeisusedwhenfull

instrumentlandingsystemisavailable.

APU,SEE-AUXILIARYPOWERUNIT

AuxiliaryPowerUnit

ARINC,SEE-AERONAUTICALRADIO

INCORPORATED

AeronauticalRadioIncorporated

ARM,Tomakereadyforoperation.

TECHNICALDICTIONARY

ARC,Thecurvedtrackoverthegroundofanaircraft

flyingataconstantdistancefromameasuring

equipment(DME).

DME

AREANAVIGATION/RNAV,Amethodofnavigation

thatpermitsaircraftoperationsonanydesiredcourse

withinthecoverageofstation-referencednavigation

signalsorwithinthelimitsofself-containedsystem

capability.

ARTIFICIALFEEL,Aforcedevelopedintheflight

controlorbrakesystemforopposingorrestricting

movement.

ASPIRATEDTATPROBE,Asensorthatmeasurestotal

airtemperaturewhentheairplaneisintheairandthat

measuresoutsideairtemperaturewhentheairplaneis

ontheground.Theoutsideairtemperatureismeasured

byusingbleedairtodrawambientairthroughthe

sensorwhentheairplaneisnotmoving.

ASSEMBLY,Thefittingtogetherofacompletestructure

orunit.

ASSUMEDTEMPERATUREREDUCEDTHRUST,The

lowerthrustobtainedbysettingahigherthanactual

OutsideAirTemperature(OAT).

ATC,SEE-AIRTRAFFICCONTROL

AirTrafficControl

TECHNICALDICTIONARY

ATE,SEE-AUTOMATICTESTEQUIPMENT

AutomaticTestEquipment

ATMOSPHERICPRESSURE,Pressureofairduetothe

earth'satmosphere,expressedinpoundspersquare

inch(psi)orinchesofmercury(inHg)ormillibars(mB).

psi

inHg

mB

ATTITUDE,Therelativeorientationoftheairplanewith

respecttopitch,roll,andyaw.

AUDIOCONTROUSELECTORPANEL,Thepanelin

theairplanewhichcontrolsandselectstheroutingof

audio.

AUTOLAND,AutomaticlandingusingtheDigitalFlight

ControlSystem.

AUTOMATICDIRECTIONFINDER,Asystemwhich

determinesthedirectionofaradiostation.

ADF

AUTOMATICFLIGHTCONTROLSYSTEM,Asystem

composedofallnecessarysubsystemsneededtoguide

theflightofanairplane.

AUTOMATICTESTEQUIPMENT,Systemtest

equipmentthatoperatesundercomputercontrol.

TECHNICALDICTIONARY

AUTOPILOT,Asystemwhichautomaticallycontrols

andguidestheflightofanairplane.

AUTOPILOTFLIGHTDIRECTORSYSTEM,An

integratedsystemcontainingautopilotandflightdirector

functions.

AUTOTHROTTLE,Asystemwhichautomatically

controlsthethrottlesofanairplane.

AUXILIARYPOWERUNIT,Asmallturbineenginein

theairplaneforsupplyingelectricalandpneumatic

powerforsystemsoperationonthegroundorinflight.

AVIONICS,Anacronymdesignatingthefieldofaviation

electronics.

AVM,SEE-AIRBORNEVIBRATIONMONITOR

AirborneVibrationMonitor

AXIALFLOWCOMPRESSOR,Atypeofcompressor

usedinagasturbineengineinwhichairpassesthrough

thecompressorinastraightflow,fronttorear.

AXIS,Animaginarystraightlineoranactualphysical

component(suchasanaxle)aroundwhichabodycan

rotate.

TECHNICALDICTIONARY

B

BACKCOURSEAPPROACH,Anapproachtoarunway

whichisoppositethenormalapproach.Fora

backcourseapproach,glideslopesignalsarenot

availableandthesenseoflocalizersignalsmustbe

reversed.

BACKGROUNDDATA,DatashownontheEFISthat

doesnotreadilychange,forexample,navigationalaids.

BAFFLE,Apartitioninatankorreservoirtoprevent

fluidmovementinthetankorreservoir.

BALANCETAB,Asmallhingedmoveablepartonthe

trailingedgeofacontrolsurface(aileron,elevator,

rudder).Thetabmovesinanoppositedirectiontothe

controlsurfaceforassistingmovementofthecontrol

surface.

TECHNICALDICTIONARY

BALANCEDFIELDLENGTH,Thefieldlength

associatedwithoptimumaircraftperformancewhen

obstaclesarenotaconstraint.Inthiscase,afterengine

failureatV1,thedistancerequiredtoaccelerate,takeoff

andreachaheightof35feetisequaltothedistance

requiredtostopfromthesamespeed.

V1

35

BALLAST,Aweightinstalledinanaircrafttomaintain

thecenterofgravitywithinallowablelimits.

BALLNUT,Afixedsphericalnutdrivenbythe

jackscrewforflapandstabilizermovement.

BAROUTOFVIEW,Asignalusedtoremovetheflight

directorcommandbar(s).

BAROMETRICPRESSURE,Thepressureofairabove

zeropressuremeasuredininchesofmercury(inHg)or

inmillibars(MB).

in

Hg

MB

BASEMETAL,Theunderliningmetaltowhichalloying

agentsormetalsareadded.

BATTERY,Anelectricaldeviceforchangingstored

chemicalenergyintodirectelectriccurrent.

TECHNICALDICTIONARY

BATTERYBUS,Anelectricalconductorsuppliedwith

directcurrentfromthebatteryortransformer-rectifierfor

powersupplytooperatingcomponents.

BATTERYCHARGER,Anelectricaldevicesupplied

withalternatingcurrent,whichproducesadirectcurrent

outputforchargingthebatteryontheairplane.

BAY,Acompartmentintheairplanestructure.

BCD,SEE-BINARYCODEDDECIMAL

BinaryCodedDecimal

BEACON,Adevicewhichemitsasignalforuseasa

guidanceorwarningaid.

BEARING(NO.1),Asurfacethatsupportsamoving

partandreducesfrictionbetweenthetwo.

NO1

BEARING(NO.2),Thedirectionfromanairplanetoa

groundstation.

NO2

TECHNICALDICTIONARY

BELLCRANK,Adoubleleverinthecontrolsystemfor

changingdirectionofmotion.

BELLOWS(NO.1),Acorrugatedflexibleductinthe

pneumaticsystemforabsorbingexpansionofductdue

toheat.

BELLOWS(NO.2),Corrugatedfoldedorpleated

containerorcompartmentusedtomeasurepressure.

BEZEL,Thepartofaninstrumentcaseforlockingthe

glass.

BIAS,Thepotentialdifferenceappliedbetweentwo

pointsforcontrollingacircuit.

BILGE,Thelowestpartofanaircraftfuselage.Aplace

wherewater,dirtandothercontaminantscollect.

TECHNICALDICTIONARY

BINARYCODEDDECIMAL,Asystemofcodingeach

digitinadecimalnumberusingthebinaryequivalent.

BINARYNUMBERSYSTEM,Anumbersystemusing

twosymbols(usuallydenoted0and1)andhaving2as

itsbase.

01

2

BIT,Inthebinarynumbersystem,thesmallestunitof

information,consistingofa0ora1.

01

BITE,SEE-BUILT-INTESTEQUIPMENT

Built-inTestEquipment.

BLANKDISPLAY,Adisplaythatdoesnothaveany

indications,normallyduetofailure.

BLACKBOX,Acontainerforelectroniccircuitstorecord

flightdata.

BLEEDAIR,Airtakenfromtheenginetopowervarious

aircraftaccessories.

BLEEDVALVE,Avalveinthepneumaticsystemforair

supplyfromtheengineorauxiliarypowerunittothe

pneumaticmanifold.Avalveontheengineforreducing

pressureinthecompressorsection.

TECHNICALDICTIONARY

BLOCKERDOOR,Adeviceontheengineforblocking

thenormalairflowduringthrustreverseroperation.

BLOWER,Anelectricallyoperatedfanforcirculatingair.

BLOWOUTPANEL,Apanelinthestructurebetween

twocompartmentsthatopenstoequalizepressurein

thecompartments.

BODYGEAR,Thelandinggearattachedtothe

fuselagestructure.

BONDINGJUMPER,Anelectricalconnectionbetween

acomponentandairplanestructureforelectrical

grounding.

TECHNICALDICTIONARY

BOOLEANALGEBRA,Amathematicalsystemfor

writingcombinationsoflogicalstatements.

BOOSTPUMP,Anelectricallyoperatedfuelpumpfor

fuelsupplyfromtheairplanefueltanktothefuel

manifold.

BORESCOPE,Anelectro-opticaldeviceforlookingat

internalpartsofanenginethroughholesintheengine.

(borescopeports)

BOURDONTUBE,Acurvedflattubeinapressuregage

formovingthepointerwhenpressurechangesinside

thetube.

BRACKET,Toencloseorsurround.

BRAKEENERGYLIMITWEIGHT,Themaximum

takeoffweightbasedontheabilityofthebrakesto

absorbapredeterminedamountofenergyduringa

rejectedtakeoff.

BREATHER,Aventtoambientoftheengineoilsystem.

TECHNICALDICTIONARY

BUFFET,Vibrationofthewingsandairframeresulting

fromunsteadyairflowoverthewing;causedwhen

airspeedistooslow,thebankangleistoosteep,or

airspeedistoofast.

BUILT-INTESTEQUIPMENT,Equipmentinstalledon

theairplaneandinairplanesystemstotestthesystems

withoutexternaltestequipment.

BUFFETMARGIN,Theamountofresidualmaneuver

capabilitypresentbeforetheonsetofbuffet.

BUGSPEED,Apreselecteedspeedtobeobserved

duringcertainmaneuvers,particularlytheapproachand

landingsequence.

BULKHEAD,Astructuralpartitioninthefuselageor

wing.

BUNGEE,Amechanicaldevice(springorashock

absorber)forassistinglandinggearoperation.

BUS,Asinglewireorgroupofwireswhichtransfers

power,data,ortimingbetweenseveralunitsor

modules.

TECHNICALDICTIONARY

BUSDRUM,Amechanicalconnectionwithpulleysand

cablesinthecontrolsystem.

BUSPROTECTIONPANEL,Amodule(blackbox)

containingelectricalcircuitsforcontrolandprotectionof

electricalalternatingcurrentsupplytotheairplane.

BUTTERFLYVALVE,Anactuator-operated,rotating

deviceinaductforclosingandopeningtheduct

passage.

BUTTOCKLINE,Averticalreferenceplanealongthe

fuselageforhorizontalmeasurementsoftheairplane.

TECHNICALDICTIONARY

BYPASSVALVE,Avalvethroughwhichairorfluidwill

flowifthenormalflowpathisblocked.

BYTE,Agrouporstringofbinarydigits.Abyteis

usuallyeightbitslong.

8

C

CABINALTITUDE,Atmosphericpressuremaintained

withinthecabin,indicatedintermsoffeetabovesea

level.

CALIBRATE,Torepair,adjust,fixorcorrectthe

measuringcapabilitiesofameasuringdevice.

CALIBRATEDAIRSPEED(CAS),Indicatedairspeed

(IAS)correctedforpositionerror.

CAS

IAS

CAM,Arotatingdeviceformovementofmechanical

Components.

TECHNICALDICTIONARY

CAM-OUT,Anautopilotconditioninwhichtheactuator

detentpistonisoverridden,eithermanuallyorbythe

otherautopilotactuator.

CAP,SEE-CAPTURE

Capture

CAPACITANCE,Themeasurementofelectricalenergy

storedinacapacitor(condenser).

CAPACITOR,Anelectricalcomponentoftwometal

platesseparatedbyadielectricmaterial,forstoring

electricalenergy.

CAPTURE,Anautopilotorflightdirectorfunctionto

acquireaselectedmode.

CAP

CARDFILE,Acontainerontheairplaneforprinted

circuitcards.

TECHNICALDICTIONARY

CASCADE,Twoormoresimilarcircuitsoramplifying

stagesinwhichtheoutputofonecircuitprovidesthe

inputofthenext.

CASCADEVANE,Avaneforturningtheengineairflow

duringoperationofthrustreverser.

CASEDRAIN,Adraincarryinglubricatingandcooling

fluidfromahydraulicpump.

CATHODE,Theelementfromwhichtheprincipal

streamofelectronsflows.

CATHODERAYTUBE,Anevacuatedglasstubewitha

viewingscreen,usedfordisplayinginformation.

CEILING,Theheightabovethegroundorwaterofthe

baseofthelowestlayerofcloudbelow6000meters

(20,000feet)coveringmorethanhalfthesky.

6000

20,000

TECHNICALDICTIONARY

CELSIUS,Atemperaturescaleinwhichzeroisthe

freezingpointofwaterand100istheboilingpointof

water.

°C

0°C

100°C

CENTEROFGRAVITY,Thebalancepointofanobject

orrigidstructureexpressedintermsofpercentMean

AerodynamicChordorininchesfromareferencepoint.

CENTERINGCAM,Acamformovingamechanismtoa

neutralposition.

CERTIFIEDCONFIGURATION,Aconfigurationofthe

aircraftapprovedforoperationbythelocalgoverning

agency.

CENTRALPROCESSINGUNIT,Inacomputeror

digitalcircuit,thesectioncontainingthearithmeticand

logic,control,andinternalmemorycircuits.

CENTRIFUGALFLOWCOMPRESSOR,Atypeof

compressorinwhichairistakenintothecenterofthe

impellerandisslungoutwardcentrifugallyintoadiffuser

whereitisslowedandpressureisincreased.

CG,SEE-CENTEROFGRAVITY

CenterofGravity

TECHNICALDICTIONARY

CHANGEOVER,Conversionfromonemodetoanother.

CHARGINGVALVE,Avalveforsupplyingairorfluidto

areservoir.

CHECKVALVE,Avalveallowingflowinonlyone

direction.SeeNon-ReturnValve.

NonReturnValve

CHECKSUM,Inacomputer,asummationofdigitsor

bitswhichareprimarilyusedforerrordetection.

CHIPDETECTOR,Amagneticpluginsumpsof

lubricatedcomponentsfordetectionofinternalfailureof

thecomponent.

CHORD,Astructuralcomponentofsparsorframes.

TECHNICALDICTIONARY

CIRCUIT,Aclosedpaththroughwhichcurrentflows

fromasource,throughvariouscomponents,andback

tothesource.

CIRCUITBREAKER,Adevicethatautomatically

interruptstheflowofelectricity(current)duringfault

conditiontoprotectwiringfromexcesscurrent.Circuit

breakersarealsousedasameanstomanually

deactivatethesystem.

CLEARWAY1,Anareabeyondthetakeoffendofthe

runwaywhichisclearofallnon-frangibleobjectswhich

maybeusedastakeoffdistanceavailablewhen

calculatingatakeoffweight.

CLEARWAY2,Adefinedrectangularareaonthe

groundorwaterunderthecontroloftheappropriate

authority,selectedorpreparedasasuitableareaover

whichanaeroplanemaymakeaportionofitsinitial

climbtoaspecifiedheight.

CLIMB,Phaseofflightwherethealtitudeisincreasing.

CLIMBLIMITWEIGHT,Maximumtakeoffweightbased

onaminimumclimbgradientwithoneengine

inoperative.

CLOCKSIGNAL,Acontinuousstringofpulsesusedfor

synchronization.

TECHNICALDICTIONARY

COALESCER,Adeviceinthewaterseparatorfor

collectingmoisturefromthecoldair.

COAXIALCABLE,Anelectricalcableusually

connectinganantennawithareceiverortransmitter.

Thecablehasaninnerconductorandanouter

groundedshield.

COAXIALSHAFT,Twoshaftsrotatingoneinsidethe

otherforrotatingthelowandhighpressure

compressorsbythelowandhighpressureengine

turbines.

COMBUSTIONCHAMBER,Apartofanenginefor

burningfuelintheairsuppliedbythecompressor.

TECHNICALDICTIONARY

COMMANDBAR,Aflightdirectorpitchorrollcommand

indication.

COMPANYROUTE,Arouteflownbytheairplane

operatorthatisnormallystoredintheflight

managementcomputer'sdatabase.

COMPASSLOCATOR,Alowpower,lowormedium

frequency(L/MF)radiobeaconusuallyinstalledin

conjunctionwiththeouterormiddlemarkerofan

instrumentlandingsystem(ILS).Itcanbeusedfor

navigationasauthorizedintheapproachprocedure.

NDB

1.OuterCompassLocator(LOM),Acompass

locatorinstalledinconjunctionwiththeouter

markerofaninstrumentlandingsystem.

1

2

NDB

NDB

2.MiddleCompassLocator(LMM),Acompass

locatorinstalledinconjunctionwiththemiddle

markerofaninstrumentlandingsystem.

COMPENSATION,Tooffset,balance,orcounteract.

COMPENSATOR,Adualcapacitorforchangingthefuel

gagingcircuitcapacitanceduetochangesinfuel

density.

COMPOSITEMATERIALS,Non-metallicmaterialsused

forairplaneconstruction.Fiberglass,Nomex,Kevlar,

graphiteEpoxyarecompositematerials.

Nomex

Kevlar

TECHNICALDICTIONARY

COMPRESSOR,Arotatingpartofanenginedrivenby

amechanicalshaftfromtheturbinesforincreasingair

pressureandtemperaturebeforetheairentersthe

combustionchamber,Lowpressurecompressor-front

sectionofcompressor,Highpressurecompressor-rear

sectionofcompressor.

COMPRESSORSTALL,Aneventthatoccurswhen

thereisacompletestoppageofairorreversalofairflow

throughthecompressor.

COMPRESSORSURGE,SEE-COMPRESSOR

CompressorStall

STALLCOMPUTEDAIRSPEED,Indicatedairspeed

correctedforthestaticsourceerror.

TECHNICALDICTIONARY

COMPUTER,Adevicethatperformsarithmetic

operations,manipulatesdata,andmakesdecisions.

CONDENSER,Thecomponentinanairconditioning

systemwhereheatenergyisgiventotheairandthe

refrigerantormoisturevaporischangedintoaliquid.

CONEBOLT,Aboltintheshapeofaconeforengine

attachmenttotheairplanestructure.

CONFIGURATION,Thepositionofflightcontrols,

landinggear,etc.,foraparticularphaseofflight,e.g.,

TakeoffConfiguration,LandingConfiguration,etc.

CONFIGURATIONDEVIATIONLIST(CDL),Appendix

intheAirplaneFlightManual(AFM)allowingoperation

oftheairplanewithcertainairframepartsmissingwhich

mayaffecttheaerodynamicperformanceofthe

airplane.

CDL

TECHNICALDICTIONARY

CONSTANTSPEEDDRIVE,Ahydro-mechanical

componentforchangingvariableenginegearboxspeed

toconstantspeedtodrivetheelectricalpower.

CONTROLAXES,Thethreeaxesoftheairplanewhich

areperpendiculartoeachotherandpassthroughthe

centerofgravityoftheairplane.

Pitchaxis-Horizontalorlateralaxis,passesthrough

theairplanefromonesidetotheother-

noseupandnosedowncontrolisby

elevators(andstabilizerfortrim).

Rollaxis-Longitudinalaxis,passesthroughthe

airplanefromfronttorear-wingupand

wingdowncontrolisbyaileronsand

flightspoilers.

Yawaxis-Verticalaxis,passesthroughthe

airplanefromtoptobottom-leftand

rightcontrolisbyrudder.

TECHNICALDICTIONARY

CONTROLCOLUMN,Amechanicalcomponentused

bytheflightcrewforoperationofailerons,flightspoilers

andelevators.

CONTROLSURFACE,Moveablepanelsonwingsand

tailformovementofairplaneonpitch,rollandyawaxes.

CONTROLTAB,SEE-BALANCETAB

BalanceTab

CONTROLAREA,Acontrolledairspaceextending

upwardsfromaspecifiedlimitabovetheearth.

CONTROLZONE,Acontrolledairspaceextending

upwardsfromthesurfaceoftheearthtoaspecified

upperlimit.

CONTROLLEDAIRSPACE,Anairspaceofdefined

dimensionswithinwhichairtrafficcontrolserviceis

providedtoIFRflightsandtoVFRflightsinaccordance

withtheairspaceclassification.

TECHNICALDICTIONARY

CONVERSION,Tochangeintoanotherform.

COORDINATES,Theintersectionoflinesofreference,

usuallyexpressedindegrees/minutes/tenthsofminutes

oflatitudeandlongitude,usedtodeterminepositionor

location.

COR