Table of Contents
1.0INTRODUCTIONANDDESCRIPTION
1.1PurposeofthisCharacteristic
1.2FunctionsandModesofOperation
1.2.1BasicModesofOperation
1.2.1.1NormalOperation
1.2.1.2BackuporReversionaryModes
1.3Reliability
1.4UnitDescription
1.4.1HeadingandAttitudeSensorUnit
1.4.2ControlPanel
1.4.3Displays
1.5Interchangeability
1.5.1General
1.6Regulatory
2.0STANDARDSREQUIREDTOEFFECTINTERCHANGEABILITY
2.1FormFactors,Connectors,andIndexPinCoding
2.1.1HeadingandAttitudeSensorUnit
2.1.2StandardAvionicsRackSpace
2.2InputandOutputSignalCharacteristics
2.3StandardInterwiring
2.4PowerCircuitry
2.4.1PrimaryPowerInput
2.4.226VACSynchroExcitation
2.5Weights
2.6EnvironmentalConditions
2.7Mounting
2.7.1Orientation
2.7.2MountingTolerances
3.0SYSTEMDESIGNCONSIDERATIONS
3.1General
3.1.1.RangeofOperation
3.1.2RelationshiptoRemoteComputers
3.1.3RelationshiptotheMagneticallySlavedGyro
Compass
3.1.4NoLatitudeInput
3.1.5AttitudeOutputIsolation
3.2BasicModesofSystemOperation
3.2.1NormalOperation
3.2.2BackuporReversionMode
3.3Outputs
3.4IntegrityMonitoringandFailureWarning
3.4.1MonitoringRequirements
3.4.1.1BasicGuidance
3.4.1.2SpecificMonitoringRequirements
3.4.2FailureWarningInputs
3.4.3FailureWarningOutputs
3.4.3.1General
3.4.3.2PrimaryWarningofPitchandRollFailures
3.4.3.3AuxiliaryFailureWarningOutput
3.4.3.4HeadingFailureWarningOutput
3.4.4ReversionModeAlertOutputs
3.5Accuracy
3.5.1PitchandRoll
3.5.1.1SystemDynamicOperatingErrors
3.5.1.2SystemStaticOperatingErrors
3.5.2PlatformHeading
3.6MagneticSlavingCutout
4.0STANDARDSIGNALCHARACTERISTICS
4.1GeneralAccuracyandOperatingRanges
4.1.1Resolution
4.1.2StandardizedOutputSignals
4.1.2.1SynchroStandards
4.1.2.2Standard"AppliedVoltage"
4.1.2.3"StandardGround"Signal
4.1.2.4PhaseReversingVoltageStandards
4.2Inputs
4.2.1TrueAirspeed(TAS)Data
4.2.1.1AnalogVoltage
4.2.1.2Synchro
4.2.1.3SerialDigital
4.2.2TASFailureWarning
4.2.3TheInputThat'sNot!
4.3Outputs
4.3.1PlatformHeading
4.3.2Pitch
4.3.2.1General
4.3.2.2OutputNo.1
4.3.2.3OutputsNo.2and3
4.3.2.4OutputNo.4(Two-wireforAutopilot)
4.3.2.5OutputNo.5(Two-wireforWeatherRadar)
4.3.3Roll
4.3.3.1General
4.3.3.2OutputNo.1
4.3.3.3OutputsNo.2and3
4.3.3.4OutputNo.4(Two-wireforAutopilot)
4.3.3.5OutputNo.5(Two-wireforWeatherRadar)
4.3.4AccelerationSignals
4.3.5FailureWarningOutputs
4.3.5.1AttitudeWarning
4.3.5.2HeadingWarning
4.3.5.3ReversionModeWarning
4.3.5.4MagneticSlavingCutout
5.0HEADINGANDATTITUDESENSORDESIGN
5.1General
5.2MountingRigidity
5.3VibrationIsolators
ATTACHMENT1NotesApplicabletotheHeadingandAttitude
SensorStandardInterwiring
ATTACHMENT2-1StandardInterwiring
ATTACHMENT2-2StandardInterwiring
ATTACHMENT3-1HASSensorUnit
ATTACHMENT3-2HASSensorUnit
ATTACHMENT4-1HASSensorUnitDimensionsandTolerances
ATTACHMENT4-2HASSensorUnitDimensionsandTolerances
ATTACHMENT5HeadingandAttitudeSensorInputsandOutputs
ATTACHMENT6HASSynchroExcitationsforStandardAft
FacingInstallations
ATTACHMENT7AttitudeOutputIsolationNeeds
ATTACHMENT8TypicalFlightProfile-LosAngelestoNewYork
ATTACHMENT9SignalPhaseReversalforTwo-wirePitchRoll
Outputs Abstract
Provides basic requirements for basic Heading and Attitude Sensor (HAS) specifically designed for installation in commercial transport type aircraft. Provides roll, pitch and stabilized heading outputs that can serve as primary references for the purpose of both guidance and display.
