|
brated in hundreds of feet per minute. VFO Variable Frequency Oscillator VFOP Visual Flight Rules Operations Panel VFR Visual Flight Rules VHF Very High Frequency. The portion of the radio spec-
trum from 30 to 300 MHz. VHS Very High Speed
VHSIC-2 Very High Speed Integrated Circuits - phase 2
VIGV Variable Integral Guide Vane
VISTA Virtual Integrated Software Testbed for Avionics
VIU Video Interface Unit
V/L VOR/Localizer
VLSI Very Large Scale Integration
VLV Valve
V/M Voltmeter
Vmo The maximum airspeed at which an aircraft is certi-
fied to operate. This can be a fixed number or a func-
tion of configuration (gear, flaps,etc.) or altitude, or
both.
VNAV Vertical Navigation
VNR VHF Navigation Receiver
Voispond A calsel function that would automatically identify an
aircraft by a voice recording. Voispond is not yet
implemented.
VOR VHF Omnidirectional Radio Range. A system that pro-
vides bearing information to an aircraft.
VOR/DME A system in which a VOR and DME station are co-
located.
VOR/MB VOR/marker beacon
VORTAC A system in which a VOR and a TACAN station are co-
located.
VOS Velocity Of Sound
VOX Voice Transmission
VPN Vendor Part Number
VR Takeoff Rotation Velocity
VRAM Video Random Access Memory
VS Vertical Speed
VSAT Very Small Aperture Terminal
VSCF Variable Speed Constant Frequency
VSCS Voice Switching and Control System
VSI Vertical Speed Indicator
VSL Advisory Vertical Speed Limit advisory may be preventive or
corrective (TCAS).
VSM Vertical Separation Minimum
VSV Variable Station Vane
VSWR Voltage-Standing Wave Ratio. The ratio of the ampli-
tude of the voltage (or electric field) at a voltage max-
imum to that of an adjacent voltage minimum. Vswr
is a measurement of the mismatch between the load
and the transmission line.
VTO Volumetric Top-Off
VTOL Vertical Takeoff and Landing
W
WAAS Wide Area Augmentation System (Method of
Differential GPS)
WADGNSS Wide Area Differential Global Navigation Satellite
System
WADGPS Wide Area DGPS
WAFS World Area Forecast System
WAI Wing Anti-Ice
WARC-92 World Administrative Radio Conference (1992)
WARC-MOB World Administrative Radio Conference for the Mobile
| 
