UML Unified Modeling Language
UMS User-Modifiable Software
UMSDT User-Modifiable Software Development Tool
UMT Universal.Mount
Unpaired A DME channel without a corresponding VOR or
Channel ILS frequency.
Uplink The.radio.transmission.path.upward.from.the.
earth.to.the.aircraft.
UP Universal.Platform
UPR User.Preferred.Route
UPRM Universal.Platform.Resource.Management
UPSMS UPS.Management.System
UPS Uninterruptible.Power.Supply
USAF United.States.Air.Force
USB Upper.Sideband.is.the.information-carrying.band.
and is the frequency produced by adding the
carrier frequency and the modulating frequency.
USTB Unstabilized
UTC Universal.Time.Coordinated.(French)
UTE Universal.Trigger.Engine
UTP Unshielded.Twisted.Pair
UUT Unit.Under.Test
UV Upper.Sideband.Voice
UW Unique Word
V (.1.).Velocity.. (.2.).Volt
V ( ) Critical.engine.failure.velocity..A.pilot.selectable. speed.on.the.PFD.
V ( R ) Takeoff.rotation.speed..A.pilot.selectable.speed. on.the.PFD.
V ( ) Takeoff.safety.speed..A.pilot.selectable.speed.on. the.PFD.
V ( T ) A general target speed for flight. A pilot selectable speed.on.the.PFD.
VA Volt-Amperes
VAC Volts.Alternating.Current
VAP (.1.).Value.Added.Processor.. (.2.).Visual.Aids.Panel
VAPS (.1.).Virtual.Applications.Prototyping.System.. (.2.).Virtual.Avionics.Prototyping.System
VAR (.1.).Variation.. (.2.).Visual-Aural.Radio.Range. (.3.).Volt-Amps.Reactive
VASI Visual.Approach.Slope.Indicator
VAU Voltage.Averaging.Unit
V BAR PFD.Flight.Director.Symbology.for.which.the. command.bars.move.vertically.for.pitch.command. and.rotate.for.roll.command.
VBV Variable.Bypass.Valve
VC (.1.).Design.Cruising.Speed.. (.2.).Virtual.Circuit
VCB Virtual.Circuit.Bridge
VCD (.1.).Variable.Capacitance.Diode.. (.2.).Voltage.Controlled.Device
VCMAX Active.Maximum.Control.Speed
VCMIN Active.Minimum.Control.Speed
VCO Variable Controlled Oscillator
VCU VDL.Control.Unit
VD (.1.).Design.Diving.Speed..
(.2.).Heading.to.a.DME.Distance
VDC Volts.Direct.Current
VDL VHF.Data.Link
VDL Mx VHF.Data.Link.Mode.X
VDR VHF.Digital.Radio
VER Version
| 
