Issued.12/04/89
DO- RTCA.document.178,.Software.Considerations.in.
Airborne Systems and Equipment Certification,
Issued.03/22/85
DOA Delegation Option Authorization: A delegation of
authority.authorized.by.the.FAA.under.FAR.Part.
21,.Subpart.J.
DOC Documentation
DOCSIS Data Over Cable Service Interface Specifications
DOD Department.of.Defense
DOORS Dynamic Object Orientated Requirements System
Doppler Effect The change in frequency observed at the receiver
when.the.transmitter.and.receiver.are.in.motion.
relative.to.each.other.
DOS Disk Operating System
DOT Department.of.Transportation
DOTS Dynamic Ocean Tracking System
Downlink The.radio.transmission.path.downward.from.the.
aircraft.to.the.earth.
DP Departure.Procedures
DPAT Boeing.Engineering.Process.Council.Display.
Process.Action.Team
DPCU Digital.Passenger.Control.Unit
Dpi dots.per.inch
DPP Decision.Point.Process
DPR Dual.Port.RAM
DPSK Differential.Phase.Shift.Keying
DQG Digital.Quartz.Gyro
DR (.1.).Data.Reconing.. (.2.).Data.Receptacle.. (.3.).Dead.Reckoning:.The.worst.degraded. mode.of.FMS.navigation..DR.is.displayed.when. no.raw.position.data.is.received.by.the.FMS.for. a.set.time.delay..In.such.situations,.position.is. computed.by.monitoring.speed.and.direction. since.last.known.position.
DRER Designated.Radio.Engineering.Representative. (FAA)
Drift Angle The.angle.between.heading.and.track..It.is.due.to. the.effect.of.wind.currents..Sometimes.called.the. crab.angle.
DRN Document.Release.Notice
DSAD Digital.Service.Access.Device
DSARC Defense System Acquisition Review Cycle
DSB Double.Side.Band..An.AM.signal.with.the.carrier.
removed. Requires the same bandwidth as the
AM.signal. DSDU Data.Signal.Display.Unit DSF Display.System.Function DSP (.1.).Digital.Signal.Processor..
(.2.).Display.Select.Panel..
( 3 ) Domain Specific Part
DSPDRV Display.Driver DSPY Display.(annunciation.on.CDU) DSR Display.System.Replacement DSS Decision.Support.Systems DSSS Direct Sequence Spread Spectrum DST Decision.Support.Tool DSU (.1.).Data.Signaling.Unit..
(.2.).Domain.Service.Unit
DTC Design.To.Cost
DTD (.1.).Data.Terminal.Display..
( 2 ) Document Type Definition
DTE Data Terminal Equipment
DT&E Development.Test.and.Evaluation
DTG Distance-to-go
DTK Desired.Track
DTMF Dual Tone Multi-Frequency
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