Garmin Flight Deck 100 Marine Instruments User Manual


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190-00728-04 Rev. A
Embraer Prodigy
®
Flight Deck 100 Pilot’s Guide
393
HAZARD AVOIDANCE
ClassATAWSincorporatesradaraltimeterinputwiththeGPS-GSLaltitudetoprovideamoreaccurateposition
referencewhenatloweraltitudesforcertainalerttypes,andtoretainalevelofgroundproximitywarningcapability
in the unlikely event of an airport, terrain or obstacle database failure.
Baro-correctedaltitude(orindicatedaltitude)isderivedbyadjustingthealtimetersettingforlocalatmospheric
conditions.Themostaccuratebaro-correctedaltitudecanbeachievedbyfrequentlyupdatingthealtimetersetting
to the nearest reporting station along the flight path. However, because actual atmospheric conditions seldom
matchthestandardconditionsdenedbytheInternationalStandardAtmosphere(ISA)model(wherepressure,
temperature,andlapserateshavexedvalues),itiscommonforthebaro-correctedaltitude(asreadfromthe
altimeter)todifferfromtheGPS-MSLaltitude.Thisvariationresultsintheaircraft’struealtitudedifferingfrom
thebaro-correctedaltitude.
TAWS-Aprovidesthefollowingalerttypes:
•ForwardLookingTerrainAvoidance(FLTA)Alerting,whichconsistsof:
•RequiredTerrainClearance(RTC)/RequiredObstacleClearance(ROC)Alerting
•ImminentTerrainImpact(ITI)/ImminentObstacleImpact(IOI)Alerting
•PrematureDescentAlerting(PDA)
•GroundProximityWarningSystem(GPWS)Alerting,whichconsistsof:
•ExcessiveDescentRate(EDR)Alerting
•ExcessiveClosureRate(ECR)toTerrainAlerting
•FlightIntoTerrain(FIT)Alerting
•NegativeClimbRate(NCR)aftertakeoffAlerting
•ExcessivebelowGlideslope/GlidepathDeviation(GSD)Alerting
•AltitudeVoiceCallOut(VCO)Alerting
DISPLAYING TAWS-A DATA
TAWS-Ausesyellow(caution)andred(warning)todepictterrainandobstacles(withheightsgreaterthan
200feetabovegroundlevel,AGL)alertsrelativetoaircraftaltitude.Colorsareadjustedautomaticallyasthe
aircraftaltitudechanges.ThecolorsandsymbolsinFigure6-87andTable6-9areusedtorepresentterrain,
obstacles, and potential impact points.
Figure 6-87 Terrain Altitude/Color Correlation for TAWS-A
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