Table of Contents
1.0INTRODUCTION
1.1PurposeofthisDocument
1.2SummaryofOperationalCharacteristics
1.3BriefDescriptionoftheSystem
1.4Interchangeability
1.5RegulatoryApproval
1.6Reliability
1.7TestabilityandMaintainability
1.8FlightSimulator
2.0INTERCHANGEABILITYSTANDARDS
2.1Introduction
2.2FormFactor,ConnectorandIndexPinCoding
2.3StandardizedSignaling
2.4StandardInterwiring
2.5PowerCircuitry
2.6ThermalInterfaceandDesign
2.7EnvironmentalConditions
2.8ADIRUMounting
2.9AirplaneDynamicEnvironment
2.10InitializationProtocolandHeadingSet
2.11Airframe-UniqueFunctions
2.12Weights
3.0SYSTEMDESIGNCONSIDERATIONSFORTHEINERTIAL
REFERENCESEGMENTOFTHEADIRU
3.1Introduction
3.2General
3.3BasicModesofSystemOperation
3.4Outputs(InertialReference)
3.5IRIntegrityMonitoringandSelf-Test
3.6InertialReferenceFunctionAccuracy
3.7InitializationProtocol
3.8HeadingSet(AttitudeModeOnly)
3.9IRSUpdatingwithGNSSData
4.0SYSTEMDESIGNFORTHEAIRDATAREFERENCESEGMENT
OFADIRU
4.1PitotandStaticAirSystem
4.2AirDataModule(ADM)
4.3AirDataReferenceIntegrityMonitoring
4.4TemperatureSensor
4.5AltitudeBaro-CorrectionSources
4.6IndicatedAngleofAttackSensors
4.7DigitalSignalStandards
4.8IndicatorStandards
4.9Built-InTestEquipment(BITE)
5.0STANDARDSSIGNALCHARACTERISTICSFORTHEINERTIAL
REFERENCESEGMENTOFTHEADIRU
5.1Introduction
5.2GeneralAccuracyandOperatingRanges
5.3DataSignals
5.4ControlSignals
5.5GPSTimeMarkInput
6.0STANDARDSIGNALCHARACTERISTICSFORTHEAIR
DATAREFERENCESEGMENTOFTHEADIRU
6.1Introduction
6.2PressureLimits
6.3ADMLeakRate
6.4ADMInputManagement
6.5ADIRUIntercommunication
6.6ADM-ADIRUInterface
6.7Airframe-UniqueFunctions
6.8MonitoringandFailureWarning
6.9FunctionalTestProvisions
6.10StandardTemperatureSensorCharacteristics
6.11GeneralCharacteristicsofADIRUComputerOutputs
6.12SpecificCharacteristicsofADRDigitalOutputs
6.13ADIRUComputerInputs
6.14SpecialEnvironmentalTestingConsiderations
7.0CONTROL/DISPLAYUNIT(CDU)DESIGN
7.1General
7.2FormFactorsandConnector
7.3Cooling
7.4PanelIllumination
7.5AnnunciatorDimming
7.6PowerSupplyforCDUOperation
7.7CDUInterfaceSummary
7.8LiquidSpillageProtection
7.9DisplayTest
8.0PROVISIONSFORAUTOMATICTESTEQUIPMENT
8.1General
8.2UnitIdentification
9.0BUILT-INTESTEQUIPMENT(BITE)
9.1Built-InTestEquipment(BITE)
9.2BITEDisplay
9.3FaultMonitor
9.4Self-TestInitiation
9.5MonitorMemoryOutput
ATTACHMENTS
1-1StandardADIRSConnector
1-2AirDataandInertialReferenceUnit(ADIRU)-
DimensionsandTolerances
1-3ADIRUMountingTray-Generallayout
2-1TypicalADIRSArchitecture
2-2TypicalADIRSArchitecture
2-3ARINC738ADIRS/ARINC743GPSInterconnect
3-1Control/DisplayUnit(CDU)OutlineandMounting
3-2CDUAnnunciatorDisplayDimming
3-3CDUConnectorPinLayout/Usage
4-1StandardInterwiring
4-2StandardInterwiringLayoutDiagram
5AccommodationofAirframe-UniqueFunctions
6EnvironmentalTestCategories
7-1IRDigitalSummary-Inputs/Outputs
7-2DigitalDataStandards,ADRPortionofADIRU
7-3ADMDigitalDataStandards
8-1IRDigitalControlWordFormat
8-2DigitalStatusWordFormat
8-3ADMDiscreteWordFormat
9PCIPlatinumSensingElements
10-1AdditionalARINC429OutputsforARINC738
(ADIRS)WhenUsedwithARINC743(GPS)
10-2DiscreteARINC429OutputsDefinitionfor
ARINC738(ADIRS)WhenUsedwithARINC743(GPS)
10-3AdditionalARINC429InputsforARINC738(ADIRS)
WhenUsedwithARINC743(GPS)
10-4DiscreteARINC429InputDefinitionforARINC738
(ADIRS)WhenUsedwithARINC743(GPS)
11GPSTimeMark
APPENDICES
1Symbols,DefinitionsandEquations
2Non-StandardApplications Abstract
Describes the characteristics of an integrated digital Air Data and Inertial References System (ADIRS) intended for installation in subsonic commercial transport aircraft. Provides general and specific design guidance for the development of an ADIRS for airline use.
