TM 1-1520-240-10            B-5 ABBREVIATION TERM UHF Ultra High Frequency . . . . . . . . US United States . . . . . . . . . . USB Upper Sideband . . . . . . . . UTIL Utility . . . . . . . . UTM Universal Transverse Mercator . . . . . . . . V Volt(s) . . . . . . . . . . . VAC Volts Alternating Current . . . . . . . . VAR Variation . . . . . . . . Vcgi Estimated Airspeed Limit with an . . . . . . . . . Operating Cruise Guide Indicator VDC Volts Direct Current . . . . . . . . VENT Ventilate . . . . . . . VFR Visual Flight Regulations . . . . . . . . Vh Maximum Airspeed in Level Flight . . . . . . . . . . (as Limited by CGI, PTIT, or Torque) VHF Very High Frequency . . . . . . . . VGI Vertical Gyro Indicator . . . . . . . . . VLF Very Low Frequency . . . . . . . . . Vmax Maximum Airspeed Limit . . . . . . . (Indicator Red Line) Vne Velocity (Airspeed) Never Exceed . . . . . . . . . VOL Volume . . . . . . . . VOR Very High Frequency Omni-Direc . . . . . . . . tional Range ABBREVIATION TERM VSI Vertical Speed Indicator . . . . . . . . . W West or Wide . . . . . . . . . . . WARN Warning . . . . . . WB Wide Band . . . . . . . . . WL Water Line . . . . . . . . . WOD Word of Day . . . . . . . WSHLD or W/S Windshield . . . . . . . . . WT Weight . . . . . . . . . X Times or By . . . . . . . . . . . XFEED Crossfeed . . . . . . XFER Transfer . . . . . . . XMIT Transmit . . . . . . . . XMSN Transmission . . . . . . . XTK/TKE Cross Track/Track Angle Error . . . . _ Degrees or Temperature . . . . . . . . . . . _C Degrees Celsius . . . . . . . . . . _/KTS Degrees per Knots . . . . . . . % Percent . . . . . . . . . . . 3/REV Three Vibrations for Each Revolu . . . . . . . tion of the Rotor