Table of Contents
1.0INTRODUCTIONANDDESCRIPTION
1.1Purpose
1.2FunctionsandModesofOperation
1.3Reliability
1.4UnitDescription
1.5Interchangeability
1.6RegulatoryApproval
2.0STANDARDSREQUIREDTOEFFECTINTERCHANGEABILITY
2.1FormFactors,Connectors,andIndexPinCoding
2.2InputandOutputSignalCharacteristics
2.3StandardInterwiring
2.4PowerCircuitry
2.5Weights
2.6EnvironmentalConditions
2.7NavigationUnitMounting
2.8ExternalProgramControl
2.9INSInter-Communications
2.10Inter-SystemComparison
2.11Control/DisplayOperationalCharacteristics
3.0SYSTEMDESIGNCONSIDERATIONS
3.1General
3.2BasicModesofSystemOperation
3.3SystemControls
3.4SystemInputs
3.5Outputs
3.6IntegrityMonitoringandFailureWarningOutputs
3.7INSEquipmentAccuracy
3.8INSInter-CommunicationsSystem
3.9INSInter-SystemComparison
3.10INSSteeringSignal
4.0STANDARDSIGNALCHARACTERISTICS
4.1GeneralAccuracyandOperatingRanges
4.2Inputs
4.3Outputs
5.0BASICDIGITALSIGNALSTANDARDS
5.1BasicSerialDataTransmissionStandards
5.2DataMessage
5.3TransmissionOrder
5.4ElectricalCharacteristics
5.5DigitalTransmitter
5.6DigitalReceiver
5.7DataCircuitSwitching
5.8RemoteDisplayDevices
6.0NAVIGATIONUNITDESIGN
6.1General
6.2MountingRigidity
7.0ELECTRONICSDESIGN
7.1General
7.2Time-SharedDigital-to-Analog(D/A)Converter
7.3TimeSharedDigitalOutputs
7.4Alignment"FigureofMerit"
7.5OutputIsolation
8.0CONTROL/DISPLAYUNITDESIGN
8.1General
8.2DataLoading
8.3PairingofOutputsforDisplay
8.4DiscretePushButtonControls
8.5DisplayDimmers
8.6PanelIllumination
8.7PolarityofDisplayedInformation
8.8DisplayLegibility
9.0MODESELECTORUNITDESIGN
9.1General
9.2ModeSelectorSwitch
9.3FunctionalTestSwitch(Optional)
9.4"Ready-Nav"Light
9.5"BATT"WarningLight
9.6PanelIllumination
10.0REMOTECONTROLANDDISPLAYUNITDESIGN
10.1General
ATTACHMENT
1NOTESAPPLICABLETOTHEINSSTANDARDINTERWIRING
2-1STANDARDINTERWIRING
2-2STANDARDINTERWIRING
3-1INSPINASSIGNMENTS(LEFTHANDPLUGS)
3-2"""(RIGHTHANDPLUGS)
3-3INSNAVIGATIONUNIT-FORMFACTOR
3-4"""-MOUNTINGDIMENSIONSAND
TOLERANCES
3-5DELETED
3-6INSPLATFORMMOUNT
4BATTERYUNITFORMFACTOR
5INPUTSANDOUTPUTS
6INSSYNCHROEXCITATION
7-1INSCONTROL/DISPLAYUNITPINASSIGNMENTS
7-2""""(PUSHBUTTONCONTROLS)
7-3""""(SELECTORSWITCH-PUSHBUTTON
CONTROLS)
7-4"REMOTECONTROLDISPLAYUNITS(SEPARATEUNITS)
8-1INSMODESELECTORPANELPINASSIGNMENT
8-2""""FORMFACTOR
9FUTURECOMPASSCOUPLERSYSTEM
10-1CUSTOMERNEEDSFORATTITUDEOUTPUTISOLATION
10-2ATTITUDEOUTPUTISOLATIONNEEDS
11-1POSSIBLEINSTRUMENTATIONCONFIGURATIONSUSINGBASIC
INSOUTPUTS
11-2TYPICALINSTRUMENTATIONSINGLESERVO(EXISTING)HSI
11-3TYPICALINSTRUMENTATIONFORTRACKANGLEBASICDISPLAY
ONTHREESERVO(NEW)HSI
11-4TYPICALINSTRUMENTATION-USEOFDRIFTANGLEPLUS
TRACKANGLEERROR(NEWTHREESERVOHSI)
12-1SUMMARYOFDIGITALOUTPUTSTANDARDS
12-2DIGITALSIGNALTIMING
12-3SIGNALTIMINGTOLERANCES
12-4BCDCODEASSIGNMENTS
12-5INSLABEL/ADDRESSCODEASSIGNMENTS
12-5-1ARINC575DADSLABEL/ADDRESSCODEASSIGNMENTS
12-6INSINPUTOUTPUTCIRCUITSTANDARDS
12-7TYPICALEXAMPLESOFSTANDARDBINARYDATAEXPRESSED
INTWO'SCOMPLEMENTFRACTIONALNOTATION
12-8LOGICLEVELWAVEFORMS
12-9ARINCBCDDIGITALWORDSTRUCTURESAPPLICABLETO
CHARACTERISTICS561,568,AND575
13INS"COMPUTERBUS"POWER
14INTERCHANGEOFDATABETWEENINSSYSTEMS
JohnMarySIGNALPHASEREVERSALFORTWO-WIREPITCHROLL
OUTPUTS
APPENDIX1DIAGRAMOFINSTERMINOLOGY
APPENDIX1DISCUSSIONOFINSTERMINOLOGYPROBLEMS
APPENDIX2DOPPLERRADARNAVIGATIONNOMENCLATURE(EXTRACTED
FROMARINCCHARACTERISTIC543)
APPENDIXX-1CHRONOLOGYOFAEECINSNEWSLETTERS
APPENDIXX-2INSSUBCOMMITTEEMEETINGPARTICIPANTS Abstract
Defines the requirements of an INS, which provides sensor and steering command outputs. The INS includes inertial sensing and provides outputs for aircraft attitude, present position, and steering signals suitable for operating the pilot's instruments. The basic INS provides complete self-contained horizontal navigation capability intended to serve as the sole means of navigation on a worldwide basis.
