Table of Contents
1.0INTRODUCTION
1.1PurposeofThisDocument
1.2SummaryofOperationalCharacteristics
1.3BriefDescriptionoftheSystem
1.3.1FlightWarningComputerUnit(FWCU)
1.3.2WarningandCautionDisplay
1.3.3StatusandMaintenancePanel
1.3.4AdditionalWarningandCautionLights
1.3.5MiscellaneousInputs
1.4Interchangeability
1.4.1General
1.4.2InterchangeabilityDesiredforthe
ARINC726FWCS
1.4.3"GenerationInterchangeability"Considerations
1.5RegulatoryApproval
2.0INTERCHANGEABILITYSTANDARDS
2.1Introduction
2.2FormFactors,ConnectorsandIndexPinCoding
2.2.1FlightWarningComputerUnit(FWCU)
2.2.2WarningandCautionDisplay
2.3Interwiring
2.4PowerCircuitry
2.4.1PrimaryPowerInput
2.4.2PowerControlCircuitry
2.4.3TheCommonGround
2.4.4TheACCommonCold
2.5SystemsFunctionsandSignalCharacteristics
2.6EnvironmentalConditions
2.7Cooling
2.7.1FWCUCooling
2.7.2WarningandCautionDisplay
2.8GroundingandBonding
3.0SYSTEMDESIGN
3.1BasicPhilosophyoftheFWCS
3.2SystemFunctions
3.2.1GeneralFunctions
3.2.1.1Cancel/Storage
3.2.1.2Recall
3.2.1.3Intelligence
3.2.1.4Re-grading
3.2.1.5Inhibiting
3.2.1.6SelfTest
3.2.1.7GroundTest
3.2.2FlightAlertFunctions
3.2.2.1Configuration
3.2.2.2Overspeed
3.2.2.3MinimumSpeed
3.2.2.4AltitudeAlert
3.2.2.5Windshear
3.2.2.6GroundProximity
3.2.2.7CollisionAvoidance
3.3AircraftSystemsAlertFunctions
3.4SystemArchitecture
4.0STANDARDSIGNALCHARACTERISTICS
4.1GeneralAccuracyandOperatingRanges
4.1.1DigitalDataStandards
4.1.2SynchroStandards
4.1.3Standard"Applied"Voltage
4.1.4Standard"Ground"/"Open"Signal
4.1.5LowLevelDCSignalStandard
4.2SystemInputs
4.2.1RadioAltimeterBus
4.2.2RadioAltimeterBus
4.2.3IRSorAHRSBus
4.2.4ILSBus
4.2.5Engine/Fuel/AirframeDataBus
4.2.6CrosstalkBus
4.2.7WarningandCautionDisplayBus
4.2.8FCCInputs
4.2.9TCCBus
4.2.10SpareInputPorts
4.2.11AnalogInputs
4.2.11.1LowLevelDCInputs
4.2.11.2SynchroInputs
4.2.11.3DiscreteInputs
4.3SystemOutputs
4.3.1WarningandCautionDisplayBuses
4.3.2CrosstalkBus
4.3.3AIDSorMaintenanceBus
4.3.4StickShakerOutput
4.3.5MiscellaneousDiscretes
4.3.6AudioOutput
4.3.7AutomaticVolumeControl
5.0AUDIBLEWARNINGGENERATION
5.1General
5.2AudibleWarningGenerationFunctions
5.2.1AutopilotDisconnectWarning
5.2.2Stall
5.2.3GroundProximityWarningandGlideSlope
DeviationAlert
5.2.4Attenson
5.2.5Reset
5.2.6EmergencyAudioCancel
5.2.7Monitoring
5.2.8Priorities
6.0WARNINGANDCAUTIONDISPLAY(WCD)
6.1General
6.2DisplayTechnology
6.3BrightnessControl
6.4WarningandCautionDisplayInterfaces
7.0LOGICSTANDARDIZATION
8.0PROVISIONSFORAUTOMATICTESTEQUIPMENT
8.1General
8.2UnitIdentification
8.2.1PinAllocation
8.2.2UseofATLASLanguage
ATTACHMENTS
1AFlightWarningComputerSystemArchitectures
1BFWCConnectorPlacement
2StandardInterwiring
NotesApplicableToTheStandardInterwiring
ConnectorInsertPinLayouts
3FlightWarningSystemSpecificationofDigital
DataTransfer
4-1FlightPhaseAdaptation
4-2ClassificationofFlightWarningFunctions
5-1TypicalProgrammableInputsAssignmentsLists
5-2TypicalProgrammableOutputApplications
6InputsDistribution
7EnvironmentalTestCategories
8-1AudibleWarningFunction
8-2A.W.G.SoundsDefinition
APPENDIX
1ChronologyAndBibliography Abstract
Describes the characteristics of a Flight Warning Computer System (FWCS) intended for use in commercial transport aircraft. It is intended to process caution and warning inputs for visual and/or audible presentation to the flight crew.
