Aviation Glossary
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V
Definition of: V
Velocity, now used in defining airspeeds:
VA = Maneuvering Speed (max structural speed for full control deflection)
VD = Max Dive Speed (for certification only)
VFE = Max Flaps Extended Speed
VLE = Max Landing Gear Extended Speed
VLO = Max Landing Gear Operation Speed
VNE = Never Exceed Speed
VNO = Max Structural Cruising Speed
VS0 = Stalling Speed Landing Configuration
VS1 = Stalling Speed in a specified Configuration
VX = Best Angle of Climb Speed
VXSE = Best Angle of Climb Speed, one engine out
VY = Best Rate of Climb Speed
VYSE = Best Rate of Climb Speed, one engine out
VARIOMETER
Definition of: VARIOMETER
A panel instrument, often as simple as a tiny ball in a vertical tube, indicating subtle pitch movements of an aircraft.
VENTRAL FIN
Definition of: VENTRAL FIN
A fin/rudder extension on the bottom of a fuselage. Opposite of DORSAL FIN.
VENTURI TUBE
Definition of: VENTURI TUBE
A small, hourglass-shaped metal tube, usually set laterally on a fuselage in the slipstream to create suction for gyroscopic panel instruments. Now outdated by more sophisticated means.
VFR
Definition of: VFR
Visual Flight Rules that govern the procedures for conducting flight under visual conditions. The term is also used in the US to indicate weather conditions that are equal to or greater than minimum VFR requirements. Also used by pilots and controllers to indicate a type of flight plan.
VFR ON TOP
Definition of: VFR ON TOP
Flight in which a cloud ceiling exists but modified VISUAL FLIGHT RULES are in effect if the aircraft travels above the cloud layer.
VISUAL METEOROLOGICAL CONDITIONS (VMC)
Definition of: VISUAL METEOROLOGICAL CONDITIONS (VMC)
Meteorological conditions expressed in terms of visibility, distance from clouds, and ceiling equal to or better than specified minima.
VOR
Definition of: VOR
VHF Omnirange. A ground-based navigation aid transmitting very high frequency (VHF) navigation signals 360° in azimuth, on radials oriented from magnetic north. The VOR periodically identifies itself by Morse Code and may have an additional voice identification feature. Voice features can be used by ATC or FSS for transmitting information to pilots.
VORTAC
Definition of: VORTAC
VOR + TACAN (Tactical Air Navigation); combined radio navigation aids.
VSI
Definition of: VSI
Vertical Speed Indicator. A panel instrument that gauges rate of climb or descent in feet-per-minute (fpm). Also Rate Of Climb Indicator.
