Table of Contents
1.0INTRODUCTIONANDDESCRIPTION
1.1PurposeofThisDocument
1.2SummaryofGPWSOperationalCharacteristics
1.3BriefDescriptionoftheSystem
1.4Interchangeability
1.5RegulatoryApproval
2.0INTERCHANGEABILITYSTANDARDS
2.1Introduction
2.2FormFactor,ConnectorsandIndexPinCoding
2.3Interwiring
2.4PowerCircuitry
2.4.1PrimaryPowerInput
2.4.2PowerControlCircuitry
2.4.3TheACCommonCold
2.4.4TheCommonGround
2.5SystemFunctionsandSignalCharacteristics
2.6EnvironmentalConditions
2.7Cooling
2.8GroundingandBonding
3.0SYSTEMDESIGNCONSIDERATIONS
3.1GPWSOperation
3.1.1GroundProximityAudibleWarning
3.1.2GroundProximityVisualWarning
3.1.3GlideSlopeDeviationAudibleAlert
3.1.4GlideSlopeDeviationVisualAlert
3.2OperatingModes
3.2.1MechanizationforMode3
3.2.2GlideSlopeModeAutomaticEnablingand
Deactivation
3.2.3GlideSlopeModeInhibit
3.2.3.1GlideSlopeModeManualInhibitFunction
3.2.3.2GlideSlopeModeAutomaticInhibitFunction
3.2.4GlideSlopeModeRe-Arming
3.3SignalInputs
3.3.1RadioHeightandValidity
3.3.2AltitudeRateandValidity
3.3.3LandingGearandFlapDiscretes
3.3.4GlideSlopeDeviationandValidity
3.3.5Self-Test
3.3.6AudioOutputSuppression
3.3.7GlideSlopeModeAutomaticEnablingand
Deactivation
3.3.8GlideSlopeModeManualInhibit
3.4SignalOutputs
3.4.1GroundProximityWarningDiscrete(Visual)
Warning
3.4.2GroundProximityAudibleWarning
3.4.3GlideSlopeModeAudibleAlerts
3.4.4MonitorOutput
3.5DiscreteWarningMode/MaintenanceMonitor
Output
3.6GrowthFeatures
3.7GeneralGuidance
3.7.1BarometricAltitudeRateDataValidityClose
totheGround
3.7.2OperationalFactorsAffectingGPWS
InstallationDesign
4.0STANDARDSIGNALCHARACTERISTICS
4.1InputSignals
4.1.1RadioHeight
4.1.2AltitudeRate
4.1.3LandingGear/FlapDiscrete(Ground)
4.1.4GlideSlopeDeviation
4.1.5Self-TestInitiation
4.1.6AudioOutputSuppression/InhibitAllModes
4.1.7GlideSlopeModeInhibit(Ground)
4.1.8GlideSlopeModeEnable(Ground)
4.1.9MachNumber/Airspeed
4.1.10SelectedRunwayHeading
4.1.11MagneticHeading
4.2OutputSignals
4.2.1GroundProximityWarningDiscrete(Visual)
Warning
4.2.2AudibleWarningandAlertOutputs
4.2.2.1LowLevelAudibleWarninganAlertOutputs
4.2.2.2HighLevelAudibleWarningandAlertOutputs
4.2.3MonitorOutput
4.2.4GlideSlopeVisualAlertOutput
4.2.5GlideSlopeModeManualInhibitActive
Output(Growth)
5.0PROVISIONSFORAUTOMATICTESTEQUIPMENT
5.1General
5.2UnitIdentification
5.3PinAllocation
5.4UseofATLASLanguage
6.0BUILT-INTESTEQUIPMENT
6.1Built-InTestEquipment(BITE)
6.2Display
6.3FaultMonitor
6.4Selt-TestInitiation
6.5MonitorMemoryOutput
ATTACHMENTS
1GPWComputerConnectorPositioning
2StandardInterwiring
NotesApplicabletotheInterwiring
3EnvironmentalTestCategories
4LogicInputSneakCircuitProjection
5DiscreteWordFormat
APPENDICES
1TechnicalStandardOrderforGPWSEquipment
(Part1)GPWSWarningEnvelopes(Part2)
2GPWSBackground
3Bibliography Abstract
Describes the characteristics of a Ground Proximity Warning System (GPWS) designed for installation in civil turbine-powered commercial aircraft. It aids pilots by providing audible and visible warnings or alerts when an aircraft approaches terrain more closely than, or deviates downward from an ILS glide slope beyond the limits set into the system.
