Aviation Dictionary: V

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V1 The speed beyond which take-off should no longer be aborted. In other words, if V1 is reached, then you as the pilot are committed to the take-off. An aborted take-off after V1 will mean that there is not enough runway available to safely bring the aircraft to a stop
Va Design manoeuvring speed. Below this speed, the aircraft will stall before experiencing any structural failure if full application of any flight controls is experienced. Above Va and the aircraft may experience significant structural damage before stalling.
VA Volcanic Ash
Vacate Leaving the runway and joining a taxi way
Variable Pitch Propeller A propeller which has the ability to change its pitch in flight, either automatically or manually by the pilot,  which reduces drag and increases performance
VASI Visual approach slope indicator
VC Vicinity
Veering wind A clockwise change in wind direction
Vertical Stabiliser Used to provide directional stability. The rudder is attached to the vertical stabiliser
Vfe Maximum flap extended speed
VFR Visual Flight Rules. You may only fly when you can actually see where you are going.
VFR Transit Lanes A pathway through a control zone or control area that has specific altitude requirements which aircraft can fly through without obtaining a clearance.
Vfto Final take-off speed
VHF Very high frequency
VIS Visibility
Visibility The ability to clearly see an object at a certain distance. The minimum visibility required for VFR flight is 5km and when obtaining weather reports, either before your flight or via an ATIS, the visibility for a specific period of time will be displayed or given in the weather report.
Visual Departure A departure by an IFR flight when either part or all of an instrument procedure is not completed and the departure is executed based on visual reference to terrain.
Visual Reference Continuous reference to either land or water
Vle Maximum landing gear extended speed
Vlo Maximum landing gear operating speed
VMC Visual meteorological conditions
Vmca Minimum control speed in the air
Vmcg Minimum control speed on the ground
Vmo Maximum operating speed
VNAV Vertical navigation
Vne Never exceed Speed
Vno Normal Operating Speed
Volcanic Hazard Zones Areas of airspace designated around a volcano. These have special conditions and the size of the area can change based on the volcanic alert level. Entering a VHZ has specific requirements.
VOLMET Meteorological information for aircraft in flight
VOR A ground based radio station which is used for navigation by pilots who have a VOR receiver in the aircraft. A VOR transmits radials from the station.
Vr Rotate speed
Vso Stall speed - flaps extended
Vs1 Stall speed - clean 
VS Vertical speed
VSI Vertical speed indicator
Vso Stall speed in landing configuration
VTC Visual terminal chart
VTOSS Take-off safety speed
Vx Best angle of climb speed
Vy Best rate of climb speed

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