Table of Contents
1.0INTRODUCTION
1.1Purpose
1.2Customers'Needs
1.3RelationshipwithOtherSpecification
1.3.1General
1.3.2RelationshipwithMIL-STD-704B
1.3.3OtherStandardsandMilitary
Specifications
1.3.4ARINCEquipmentCharacteristics
1.4Useof"SpecificationLanguage"
1.5UseofThisReport
1.6SignificanceofInterchangeability
1.7WireImpedancesandElectricalCurrent
Requirements
1.8Credits
2.0POWERSYSTEMCHARACTERISTICS
2.1General
2.2PowerSources
2.2.1+28VDCPower
2.2.1.1Availability
2.2.1.2Characteristics
2.2.2115Volt,400CPSHzPower
2.2.2.1Availability
2.2.2.2ACPowerCharacteristics
2.2.326VoltInstrumentationBusandUseof
theTerm"AutopilotPhase"
2.3VoltageRegulation
2.3.1MIL-STD-704BRequirements
2.3.1.1PowerCharacteristicsattheEquipment
Terminals
2.3.1.2SteadyStateVoltageandFrequencyLimits
2.3.2BatterySupplies
2.3.2.1Lead-AcidBatteries
2.3.2.2NickelCadmiumBatteries
2.4NoiseandHarmonicContent
2.5TypicalAircraftPowerSystem
2.6ClassificationofOperatingModes
2.6.1NormalElectric-SystemOperation
2.6.2AbnormalElectric-SystemOperation
2.6.3EmergencyElectric-SystemOperation
2.6.4GroundPowerOperation
3.0VOLTAGETRANSIENTS
3.1BackgroundInformation
3.2SignificanceofTransientsonDCBusesas
OpposedtoThoseonACBuses
3.3VoltageTransientProtection
4.0INTERFERENCECONTROL
4.1General
4.2RelationshipofAirlineNeedstoMIL-E-
6051andMIL-I-6181
4.3RTCA/EUROCAEInterferenceControl
Standards
4.4EquipmentSusceptibilitytoConducted
Noise
4.5GenerationofNoiseandInterference
4.6SusceptibilitytoRadiatedInterference
4.7OtherInterferenceControlConsiderations
4.8UseofSinglePointGroundCircuitry
4.9CategoriesofInterferenceProtection
4.10WireShields(Screens)
5.0CIRCUITPROTECTION
5.1General
5.2PowerFeedCircuitBreakersandFuses
5.3EquipmentProtectionbyPowerFeedCircuit
BreakersandFuses
6.0EMERGENCYPOWERANDEQUIPMENTOPERATION
6.1NeedforEmergencyPower
6.2CharacteristicsofPowerfromEmergency
Sources
6.3EquipmentOperationDuringEmergency
conditions
6.4EmergencySourceofAircraftPower
7.0INSTRUMENTATIONCIRCUITS
7.1General
7.2NeedandImportanceofProvidingan
Internal26VACInstrumentationSupply
7.3OverloadProtectionof26V.A.C.Internal
PowerSources
7.4ChoiceBetweenAircraftandInternal
SystemInstrumentationPower
7.5NeedtoAvoidSneakCircuits
8.0EQUIPMENTUTILIZATIONPOWERDESIGN
8.1ChoiceofPower
8.1.1IndustryMutuallyAgreesUponTypesof
Power
8.1.2WhyItisNotAcceptableforThisorThat
EquipmenttoUtilizeTypesofPowerOther
ThanSetForthIntheARINCSpec
8.2RequirementsforEquipmentToleranceto
SupplyVoltageVariation
8.2.1EquipmentOperatingfrom+28VoltDCPower
8.2.2EquipmentOperatingfrom115VACPower
8.2.3LowVoltageOperation
8.3RequirementforEquipmentRejectionof
RippleontheDCPower
8.4EquipmentandPersonnelProtection
8.4.1ProtectionAgainstHighVoltage
8.4.2PotentialonExternalParts
8.4.3ProtectionofComponents
8.4.4ProtectiveDevices
8.5PreventionofSmoke
8.6ReversePolarityProtection
9.0AIRPLANECOMPUTERBUS
ATTACHMENTS
1MilitaryStandard704BAircraftElectric
PowerCharacteristics
2"Old"VS."New"115VACPowerSystems
3-1CategoriesofInterferenceProtection
3-2WireShieldingGroundingStandards
4TypicalAirlineInstallations
5AlternateSource26VACExcitation
6InterwiringDiagrams
7"ComputerBus"Power
APPENDICES
1ReferencePublicationsSpecifications
andReports
2Chronology,Participation,and
BibliographyoftheAircraftElectrical
PowerUpdateProject
3LockheedElectricPowerSpecforL-1011
4AircraftElectricalPowerSystem
Transients-BoeingReportD-6-336855OriginalIndustryProposalsforTransient
5OriginalIndustryProposalsforTransient
Limits
6EffectiveBusImpedanceInOhms
7AchievingElectromagneticCompatibility
ByControloftheWiringInstallation
DouglasPaper1661
8VariableSpeedConstantFrequency
ElectricalPowerSystem
9TypicalNickel-CadmiumBatteryDischarge
Curves
10TypicalAircraftCircuitBreakerTime-
CircuitCharacteristics
11SummaryofIndustryDesiredChangesto
MIL-STD-704B
12ElectricPowerQualitySpecification
Comparison
13MilitaryStandard704ElectricPower,
Aircraft,CharacteristicsandUtilization
ofOctober6,1959
14MilitaryStandard704AElectricPower,
Aircraft,CharacteristicsandUtilization
ofMay5,1970
15AEECPowerUpdateProject-U.S.Navy
Comments
Abstract
Provides guidance to airframe manufacturers concerning the utilization of aircraft electrical power. This standard covers the description of basic power characteristics, and detailed guidance concerning transient protection, interference control, and equipment installation considerations.
