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V1: Takeoff decision speed, the minimum speed where it will be possible to continue flight after an engine failue. This is also the maximum speed at which it will be possibel to bring the aircraft to a complete stop within the remaining runway length if takeoff is aborted.

VR: Rotation speed, where the pilot initiates rotation to liftof aircraft attitude and clibm away with the scheduled takeoff performance. VR is greater than V1

V2: Takeoff safety and initial climb speed, the minimum speed at which climb can be continued safely.

VARIOMETER: Any especially sensitive vertical speed indicator, typically found in gliders.

VASI: Visual Approach Slope Indicator, a system of lights place adjacent to a runway that allow the pilot to maintain a proper glideslope for landing. At many airports VASI has been replaced by PAPI, Precision Approach Path Indicator.

VFR ON TOP: ATC authorization for an IFR aircraft to operate in VFR conditions at an appropriate VFR altitude above the clouds

VFR: Visual Flight Rules, the rules that govern flight under visual conditions; also used to indicate that weather conditions are suitable for visual flight

VISUAL APPROACH: An approach conducted on an IFR flight plan which authorizes the pilot to procede visually and clear of clouds to the airport

VISUAL DESCENT POINT: A defined point on a non-precision instrument approach from which normal descent from the MDA to the runway can be commenced

VMC: Visual Meteorological Conditions, weather conditions where visibility and cloud ceiling allows legal VFR flight

VNAV: Vertical Navigation, engaging the altitude profile programmed into a flight management computer.

VNE: Velocity Never Exceed, the indicated airspeed above which dynamic air pressures threaten the integrity of the airframe. Often called the airframe's "redline".

VOR: Very High Frequency Omnidirectional Range Station, a ground based navigation aid transmitting VHF navigation signals, 360 degrees in azimuth, oriented from magnetic north


VORTAC: VHF Omnidirectional Range/Tactical Air Navigation, a radio navaid providing VOR azimuth, TACAN azimuth and TACAN distance measuring (DME) at one site

VORTEX STREET: A trail of vortices shed when airflow is turbulent.

VSI: Vertical Speed Indicator.


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