DDU Display.Drive.Unit
DEB Design.Eye.Box..The.three.dimensional.volume.in. space.surrounding.the.Design.Eye.Position.from. which.the.HUD.information.can.be.viewed.
DECCA A.navigation.system.widely.used.by.shipping.in. Europe..The.ground.facilities.consist.of.a.master. station.and.several.slave.stations.
Decimal Base-10.counting.system..Numbers.include.0,.1,. 2,.3,.4,.5,.6,.7,.8,.9.
ded Dedicated
DEFDARS Digital Expandable Flight Data Acquisition and
Recording.System
DEFL Deflection
DEG Degree
DEL Delete
Demand Mode An.ACARS.mode.of.operation.in.which.
communications.may.be.initiated.by.the.ground.
processor.or.the.airborne.system.
DEP (.1.).Departure..
(.2.).Design.Eye.Position..The.position.at.each.
pilot’s.station.from.which.a.seated.pilot.achieves.
the.optimum.combination.of.outside.visibility.and.
instrument.scan.
DER Designated.Engineering.Representative:.
Designation.of.authority.by.the.FAA.authorized.
under.FAR.Part.183,.Subpart.B.
DES Descent
DESCR Description
Desensitization TCAS.sensitivity.level.(threat.volume).reduction
DES Descent:.An.autopilot.Flight.director.mode.
DEST Destination
DEV Deviation
DF Definition File
DFA Direction.Finding.Antenna
DFCS Digital.Flight.Control.System
DFDAF Digital Flight Data Acquisition Function
DFDAMU Digital Flight Data Acquisition Management Unit
DFDAU Digital Flight Data Acquisition Unit. The DFDAU
samples, conditions and digitizes the flight data.
DFDR Digital.Flight.Data.Recorder
DFDU Digital.Flight.Data.Unit
DFIDU Dual.Function.Interactive.Display.Unit
DFIU Digital.Flight.Instrument.Unit
DFS Digital Frequency Select
DFU Digital.Function.Unit
DG Directional.Gyro:.Mode.of.AHS.operation.that.
provides heading data without the benefit of a flux
(AHRS).or.normal.alignment.(IRS).
DGAC Direction.Generale.de.l’Avaiation.Civile.(France’s.
Civil.Aviation.Agency).
DGNSS Differential.Global.Navigation.Satellite.System
DGPS Differential.Global.Positioning.System.
DH ( 1 ) Dataflash Header .
( 2 ) Decision Height: Specified height in the
precision.approach.at.which.a.missed.approach.
must be initiated if the required visual reference to
continue.the.approach.has.not.been.established.
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