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ANDOCUMENTPreparedbyAIRLINESELECTRONICENGINEERINGCOMMITTEEPublishedbyAERONAUTICALRADIO,INC.2551RIVAROAD,ANNAPOLIS,MARYLAND21401-7435AIR/GROUNDCHARACTER-ORIENTEDPROTOCOLSPECIFICATIONARINCSPECIFICATION618-6PUBLISHED:June16,2006DISCLAIMERTHISDOCUMENTISBASEDONMATERIALSUBMITTEDBYVARIOUSPARTICIPANTSDURINGTHEDRAFTINGPROCESS.NEITHERAEECNORARINCHASMADEANYDETERMINATIONWHETHERTHESEMATERIALSCOULDBESUBJECTTOVALIDCLAIMSOFPATENT,COPYRIGHTOROTHERPROPRIETARYRIGHTSBYTHIRDPARTIES,ANDNOREPRESENTATIONORWARRANTY,EXPRESSORIMPLIED,ISMADEINTHISREGARD.AEECUSESREASONABLEEFFORTSTODEVELOPANDMAINTAINTHESEDOCUMENTS.HOWEVER,NOCERTIFICATIONORWARRANTYISMADEASTOTHETECHNICALACCURACYORSUFFICIENCYOFTHEDOCUMENTS,THEADEQUACY,MERCHANTABILITY,FITNESSFORINTENDEDPURPOSEORSAFETYOFANYPRODUCTS,COMPONENTS,ORSYSTEMSDESIGNED,TESTED,RATED,INSTALLEDOROPERATEDINACCORDANCEWITHANYASPECTOFTHISDOCUMENTORTHEABSENCEOFRISKORHAZARDASSOCIATEDWITHSUCHPRODUCTS,COMPONENTS,ORSYSTEMS.THEUSEROFTHISDOCUMENTACKNOWLEDGESTHATITSHALLBESOLELYRESPONSIBLEFORANYLOSS,CLAIMORDAMAGETHATITMAYINCURINCONNECTIONWITHITSUSEOFORRELIANCEONTHISDOCUMENT,ANDSHALLHOLDARINC,AEEC,ANDANYPARTYTHATPARTICIPATEDINTHEDRAFTINGOFTHEDOCUMENTHARMLESSAGAINSTANYCLAIMARISINGFROMITSUSEOFTHESTANDARD.THEUSEINTHISDOCUMENTOFANYTERM,SUCHASSHALLORMUST,ISNOTINTENDEDTOAFFECTTHESTATUSOFTHISDOCUMENTASAVOLUNTARYSTANDARDORINANYWAYTOMODIFYTHEABOVEDISCLAIMER.NOTHINGHEREINSHALLBEDEEMEDTOREQUIREANYPROVIDEROFEQUIPMENTTOINCORPORATEANYELEMENTOFTHISSTANDARDINITSPRODUCT.HOWEVER,VENDORSWHICHREPRESENTTHATTHEIRPRODUCTSARECOMPLIANTWITHTHISSTANDARDSHALLBEDEEMEDALSOTOHAVEREPRESENTEDTHATTHEIRPRODUCTSCONTAINORCONFORMTOTHEFEATURESTHATAREDESCRIBEDASMUSTORSHALLINTHESTANDARD.ANYUSEOFORRELIANCEONTHISDOCUMENTSHALLCONSTITUTEANACCEPTANCETHEREOF“ASIS”ANDBESUBJECTTOTHISDISCLAIMER.©2006BYAERONAUTICALRADIO,INC.2551RIVAROADANNAPOLIS,MARYLAND21401-7435USAPreparedbytheAirlinesElectronicEngineeringCommitteeSpecification618AdoptedbytheAirlinesElectronicEngineeringCommitteeNovember4,1992SummaryofDocumentSupplementsSupplementAdoptionDatePublishedSpecification618-1October19,1994December30,1994Specification618-2October22,1996December20,1996Specification618-3October8,1998November18,1998Specification618-4July16,1999August16,1999Specification618-5June26,2000August31,2000Specification618-6April4,2006June16,2006AdescriptionofthechangesintroducedbyeachsupplementisincludedonGoldenrodpaperattheendofthisdocument.ARINCSPECIFICATION618-6AIR/GROUNDCHARACTER-ORIENTEDPROTOCOLSPECIFICATIONPublished:June16,2006iiFOREWORDAeronauticalRadio,Inc.,theAEEC,andARINCStandardsAeronauticalRadio,Inc.(ARINC)wasincorporatedin1929byfourfledglingairlinesintheUnitedStatesasaprivately-ownedcompanydedicatedtoservingthecommunicationsneedsoftheairtransportindustry.Today,themajorU.S.airlinesremaintheCompany’sprincipalshareholders.Othershareholdersincludeanumberofnon-U.S.airlinesandotheraircraftoperators.ARINCsponsorsaviationindustrycommitteesandparticipatesinrelatedindustryactivitiesthatbenefitaviationatlargebyprovidingtechnicalleadershipandguidanceandfrequencymanagement.Theseactivitiesdirectlysupportairlinegoals:promotesafety,efficiency,regularity,andcost-effectivenessinaircraftoperations.TheAirlinesElectronicEngineeringCommittee(AEEC)isaninternationalbodyofairlinetechnicalprofessionalsthatleadsthedevelopmentoftechnicalstandardsforairborneelectronicequipment-includingavionicsandin-flightentertainmentequipment-usedincommercial,military,andbusinessaviation.TheAEECestablishesconsensus-based,voluntaryform,fit,function,andinterfacestandardsthatarepublishedbyARINCandareknownasARINCStandards.TheuseofARINCStandardsresultsinsubstantialbenefitstoairlinesbyallowingavionicsinterchangeabilityandcommonalityandreducingavionicscostbypromotingcompetition.TherearethreeclassesofARINCStandards:a)ARINCCharacteristics–Definetheform,fit,function,andinterfacesofavionicsandotherairlineelectronicequipment.ARINCCharacteristicsindicatetoprospectivemanufacturersofairlineelectronicequipmenttheconsideredandcoordinatedopinionoftheairlinetechnicalcommunityconcerningtherequisitesofnewequipmentincludingstandardizedphysicalandelectricalcharacteristicstofosterinterchangeabilityandcompetition.b)ARINCSpecifications–Areprincipallyusedtodefineeitherthephysicalpackagingormountingofavionicsequipment,datacommunicationstandards,orahigh-levelcomputerlanguage.c)ARINCReports–Provideguidelinesorgeneralinformationfoundbytheairlinestobegoodpractices,oftenrelatedtoavionicsmaintenanceandsupport.ThereleaseofanARINCStandarddoesnotobligateanyairlineorARINCtopurchaseequipmentsodescribed,nordoesitestablishorindicaterecognitionortheexistenceofanoperationalrequirementforsuchequipment,nordoesitconstituteendorsementofanymanufacturer’sproductdesignedorbuilttomeettheARINCStandard.InordertofacilitatethecontinuousproductimprovementofthisARINCStandard,twoitemsareincludedinthebackofthisvolume:AnErrataReportsolicitsanycorrectionstothetextordiagramsinthisARINCStandard.AnARINCIAProjectInitiation/Modification(APIM)formsolicitsanyrecommendationsforadditionofsubstantive