WRAU Weather.Radar.Attention.Unit
WRS Wide-area.Reference.Station
WRT WXR.Receiver/Transmitter
WSDDM Weather.Support.for.Deicing.Decision.Making
W/STEP With.Step.Change.in.Altitude
WT Weight
WX Weather
WXI WXR.Indicator
WXP Weather.Radar.Panel
WXR Weather.Radar.System
WWW World.Wide.Web
WYPT Waypoint.Altitude
XA ARINC
X-BAND The frequency range between 8000 and .
12500.MHz
XB International.Air.Transport.Association.(IATA)
X-Channel A.DME.channel..There.are.126.X-channels.for.
DME operation. For the first 63 channels, the
ground-to-air frequency is 63 MHz be low the
air-to-ground frequency. For the second 63-X
Channels the ground-to-air frequency is 63 MHz
above the air-to-ground frequency.
XCVR Transceiver
XFR Transfer
XID Exchange Identification
XLS Cross-side
XLTR Translator
XM External.Master
XMIT Transmit
XML eXtended.Markup.Language
XMTR/RCVR Transmitter/Receiver
XPD ATC.Transponder.(also.XPDR,.X.PNDR,.TPR)
XPDR Transponder
XPTR Cross Pointer: The flight director command bars.
Pitch.command.is.shown.with.vertical.motion.of.
the.horizontal.bar.and.roll.command.is.shown.
with.lateral.motion.on.the.vertical.bar.
XS SITA
XSIDE Cross-side
XTI X/Open Transport Interface
XTK Crosstrack.(crosstrack.error)
XTP Express.Transfer.Protocol
Yagi Antenna An.antenna.with.its.maximum.radiation.parallel.
to.the.long.axis.of.its.array,.consisting.of.a.driven.
dipole, a parasitic dipole reflector, and one
parasitic.dipole.director.or.more. YAW Refers.to.movement.about.the.vertical.axis.of.the.
aircraft
YSAS Yaw.Stability.Augmentation.System
YD Yaw.Damper
Z ( 1 ) Refer to reflectivity factor .
(.2.).Zulu.(GM.Time)
ZDE Zone Distribution Equipment
ZFW Zero.Fuel.Weight
Z-Marker A.marker.beacon,.sometimes.referred.to.as.a.
station locator, that provides positive identification
to.the.pilot.when.the.aircraft.is.passing.directly.
over a low-frequency navigation aid.
Z Zulu.Time
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