Table of Contents
Foreword
Introduction
1.0Generalstandards
1.1Operationofcontrols
1.2Accessibilityofcontrols
1.3Effectsoftests
2.0Minimumperformancestandardsunderstandardtest
conditions
2.1Accuracyofpilot'sdisplay
2.2Accuracyoftheprecisionequipmentoutput
2.3Precisionequipmentoutputnoise
2.4Timeconstant
2.5Ratedata
2.6Failurewarningsystem
2.6.1Warningconditions
2.6.2Warningindicationcharacteristics
2.7Transmitteroperatingfrequency
2.8Emissionofradio-frequencyenergy
2.9Multiplexoperation
2.10Self-testfeature
3.0Minimumperformancestandardsunderenvironmental
testconditions
3.1Temperature-altitudetests
3.1.1Lowtemperaturetest
3.1.2Hightemperaturetest
3.1.3Decompressiontest(whenrequired)
3.1.4Altitudetest
3.1.5Overpressuretest(whenrequired)
3.2Humiditytest
3.3Shocktest
3.4Vibrationtest
3.5Temperaturevariationtest
3.6Powerinputtest
3.6.1Electricalinputvariationtest
3.6.2Lowvoltagetest
3.7Conductedvoltagetransienttest
3.8Conductedaudio-frequencysusceptibilitytest
3.9Audio-frequencymagneticfieldsusceptibility
test
3.10Radio-frequencysusceptibilitytest(radiatedand
conducted)
3.11Explosiontest(whenrequired)
3.12Waterproofness(dripproof)test(whenrequired)
3.13Hydraulicfluidtest(whenrequired)
3.14Sandanddusttest(whenrequired)
3.15Fungusresistancetest(whenrequired)
3.16Saltspraytest(whenrequired)
Table1
Membership
AppendixA-Testprocedures-airbornelowrangeradar
altimeters
PartI-Definitionsoftermsandconditionsoftest
APowerinputvoltage-directcurrent
BPowerinputvoltage-alternatingcurrent
CAdjustmentofequipment
DTestinstrumentprecautions
EAmbientconditions
FWarm-upperiod
GConnectedload
HDescriptionoftestequipment
PartII-Detailedtestprocedures
T-1Accuracy(inflight)
T-2Altitudeaccuracyandloopgain
T-3Altitudenoise
T-4Timeconstant
Figures1-3
AppendixB-Minimumperformancestandardsforlowrange
radaraltimeters(externallooploss
standards)
1.0Definitionofexternallooploss
2.0Characteristicsofexternallooploss
3.0Externallooploss,beamlimitedcase
4.0Externallooploss,pulselimitedcase
5.0EssentialsofForF(H)
5.1M(H)
5.2V*(H)
6.0Curvesofexternallooploss
Figures1-6
AppendixC-Antennaconcepts
1.0Antennaconcepts
2.0Thecalculationofexternallooploss(CWorbeam
limitedpulsecase)
2.1Generalexpression
2.2Derivationofthegeneralexpression
2.3Externallooplossforconstantbeamandsigmao
(theta)
2.4ExternallooplossforconstantbeamandLambert
lawscattering
2.5Externallooplossforcostothepowermoftheta
beamandLambertlawscattering
2.6Simplederivationforexternallooploss
3.0Pulsedaltimetercase
3.1Asimplederivationforthepulselimitedcase
4.0Thechoiceofsigmao(0)
4.1Pulselimitedcase
4.2Lessthan100ftperformance
5.0Effectsofantennaspacing
5.1Firstapproachtotheeffects
5.2ValueofVinrespecttotheassumptions
Figures1and2 Abstract
Defines test procedures for those characteristics of an Airborne Low-Range Radar Altimeter that are essential for its operation in applications to provide measured height above terrain for obstruction clearance and landing.
