Table of Contents
1.0INTRODUCTIONANDDESCRIPTION
1.1PurposeandScope
1.2RelationshiptoOtherDocuments
1.3FunctionalOverview
1.4SystemDescription
1.5DataBaseControl
1.6Interchangeability
1.6.1General
1.6.2InterchangeabilityDesiredfortheTAWS
Components
1.6.3"GenerationInterchangeability"Considerations
1.7RegulatoryApproval
1.8IntegrityandAvailability
1.9Reliability
1.10TestabilityandMaintainability
1.11FlightSimulators
1.12TAWSOptionalFeatures
2.0INTERCHANGEABILITYSTANDARDS
2.1Introduction
2.2FormFactors,Connectors,andIndexPinCoding
2.3StandardInterwiring
2.3.1Standard"Open"
2.3.2Standard"Ground"
2.4PowerCircuitry
2.4.1PrimaryPowerInput
2.4.2PowerControlCircuitry
2.4.3TheACCommonCold
2.4.4TheCommonGround
2.4.5TAWSPowerOutputs
2.4.5.1TCMPower
2.4.5.2ResistiveSensorExcitationPower
2.4.5.3AirDataComputerPower
2.4.6Batteries
2.5StandardizedSignaling
2.5.1GeneralAccuracyandOperatingRanges
2.5.2Resolution
2.5.3ARINC429DataBus
2.5.3.1ARINC429DataBusInputs
2.5.3.2ARINC429DataBusOutputs
2.5.4DiscreteSignals
2.5.4.1DiscreteInput-Open/Ground
2.5.4.2DiscreteInput-Open/28Vdc
2.5.4.3GroundDiscreteOutput
2.5.4.3.1LowPowerDiscreteOutput
2.5.4.3.2HighPowerDiscreteOutput
2.5.5StandardAnnunciators
2.5.6DisplayOutputBusOptions
2.5.6.1AEEC453DisplayBus
2.5.6.2OtherDisplayOutputs
2.5.7RS-232Interface
2.5.8Built-InTest
2.6EnvironmentalConditions
2.7Cooling
2.8Weights
2.9GroundingandBonding
2.10Power
3.0SYSTEMDESIGNCONSIDERATIONS
3.1TAWSSystemFunctions
4.0INTERFACESANDPROTOCOLS
4.1TAWSArchitecture
4.2DigitalInterfaces
4.2.1ARINC429Interfaces
4.2.1.1ARINC429InputLabels
4.2.1.2ARINC429OutputLabels
4.2.2RS-422Input
4.3AnalogInputs
4.3.1StaticAirTemperature(SAT)
4.3.1.1SAT,CurrentModulated
4.3.1.2SAT,DCRadio(ARINC565)
4.3.1.3SAT,DC
4.3.2RadioHeight
4.3.3BarometricAltitudeRate
4.3.3.1Baro-Alt.Rate,DCRadio
4.3.3.2Baro-Alt.Rate,DC
4.3.3.3Baro-Alt.Rate,DC(ARINC575/576)
4.3.3.4Baro-Alt.Rate,ACRadio(ARINC545A/565)
4.3.4BarometricAltitude
4.3.4.1DCSignal
4.3.4.2ARINC565Signal
4.3.5GlideslopeandLocalizer
4.3.6GlideslopeValidity-LowLevel
4.3.7Airspeed
4.3.7.1ComputedAirspeed(ARINC545/565)
4.3.7.2CalibratedAirspeed
4.3.7.3IndicatedAirspeed
4.3.7.4MachNumber(ARINC545/565)
4.3.7.5MachNumber(ARINC575)
4.3.8RollAttitude
4.3.9PitchAttitude
4.4DiscreteInputs
4.4.1SignalDiscretes
4.4.2ProgramDiscretes
4.5DiscreteOutputs
4.5.1Logic/LampDrivers
4.5.2MonitorLampDrivers
4.5.3TerrainDisplaySwitchingDiscretes
4.6TAWSConfigurationModule(TCM)
4.7AudioOutputs
4.7.1AudioSpeaker
4.7.2InterphoneOutput
4.8DisplayVideoOutput
4.9DataLoadingInterface
4.10TCMInterface
4.11ATEInterface
5.0BUILT-INTESTANDMAINTENANCEPROVISIONS
5.1FaultDetectionandReporting
5.1.1General
5.1.2SelfMonitoring
5.1.3FailureRateMonitor
5.1.4FaultMessaging
5.2RampMaintenanceandReturntoServiceTesting
5.3ProvisionsforAutomaticTestEquipment
5.3.1General
5.3.2ATETesting
5.3.3UpgradestoATE
5.4TAWSConfigurationVerification
ATTACHMENTS
1-1115VAC-RearConnector
1-228VDC-RearConnector
1-3TAWS-RearConnectorLayout
2-1RearConnectorInsertConfiguration
2-2TAWCInterfacePins(byShellandPinNumber)
2-3TypicalMulti-UsePinUtilization
3EnvironmentalTestCategories(RTCADO-160)
4-1TAWSInputBlockDiagram-Typical
4-2TAWSOutputBlockDiagram-Typical
5TAWSConfigurationModule(TCM)Characteristics
6ExampleTAWSConfigurationModule(TCM)Data
7-1TypicalARINC429InputLabels
7-2TypicalARINC429OutputLabels
8GlossaryofAcronyms Abstract
Provides the characteristics of a Terrain Awareness and Warning System (TAWS) - Analog intended for installation in aircraft with a mix of analog and digital signal interfaces. The intent of this document is to provide general and specific guidance for the development and the installation of the TAWS unit primarily for airline use. Describes the desired operational capability of the equipment, the standards necessary to ensure interchangeability, form factor, and pin assignments. Aims to encourage equipment manufacturers to produce maintenance-free, high performance equipment rather than that of minimum weight and dimensions.
