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XIR
XIR X-ray image recording
XL Inductive reactance.
XL Moment of total lift of aerodyne about c.g.
XLTR Translator.
XM 1 Extra marker.
2 External master.
XMIT[S] Transmit[s].
XML Extensible markup language.
XMM X-ray multi-mirror [mission].
xmsn Tramnsmission.
xmt XMIT.
XMTR, xmtr Transmitter.
XN Runway intersection.
X n 1 Net thrust [at a specified condition].
2 The n th in-phase signal sample applied to digital filter
during any one integration period.
XNG Crossing.
XO 1 Executive officer (USN).
2 Plans and operations [executive order] (USAF).
XOE Operational electronic-warfare branch.
XPC External power connector, or contactor.
XPCD Expected.
XPD XPDR.
XPDR, xpdr ATC transponder.
xponder XPDR.
XPR XPDR.
XPS X-ray photoelectron spectroscopy.
XR 1 Code: Office of CoS Plans and Programs (AFSC).
2 Extended-range.
XRD X-ray diffractometer or diffractometry.
XRED X-ray energy dispersion analysis.
XRF/NAA X-ray fluorescence neutron-activation
analysis.
Xylonite
XRL X-ray laser.
XRT X-ray telescope.
XS 1 Atmospherics (ICAO).
2 Code: SITA.
xsmn Transmission (both radio and helicopter dynamic
parts).
XSS 1 Expendable sonobuoy [or sonar or sonic]
sensor(s).
2 Experimental small satellite.
XST 1 Experimental survivable technology.
2 Experimental supersonic transport.
xtal Crystal.
XTI X/open transport interface.
XTK Cross-track distance error.
XTRA X-band thin radar array (AFRL).
XTP Express transfer protocol.
XTRM Extreme.
XUAV Expendable UAV.
XUV Experimental unmanned vehicle (USA).
XVGA X-video graphics adpater.
X W+u Distance along OX axis of c.g. of wing and undercarriage
(landing gear) from c.g. of complete aircraft.
X-wind Crosswind, crosswind component.
XX Heavy [stormy] weather.
XXX CW transmission for uncertainty or alert (Int.).
Xydar Liquid-crystal thermoplastic, good microwave
transparency and often glass-reinforced (Dartco).
xylene Family of toxic aromatic and inflammable
hydrocarbons in some ways resembling benzene, with
general formula C 8 H 10 , widely used as solvent; trade name
Xylol.
Xylonite Proprietary thermosetting material similar to
Celluloid.
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