Aviation Maintenance Terms beginning with V

V

Volts; Voltage; Vertical; Valve

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V ac, Vac, or VAC

Volts Alternating Current

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V dc, Vdc, or VDC

Volts Direct Current

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V1

The maximum speed in the takeoff at which the pilot must take the first action (e.g., apply brakes, reduce thrust, deploy speed brakes) to stop the airplane within the accelerate-stop distance. V1 also means the minimum speed in the takeoff, following a failure of the critical engine at VEF, at which the pilot can continue the takeoff and achieve the required height above the takeoff surface within the takeoff distance.

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V2

Takeoff safety speed

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V2

Takeoff safety speed.

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V2min

Minimum takeoff safety speed.

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VA

Volt-Amperes

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VA

Design maneuvering speed.

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VAPP

Target approach airspeed

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VAR

Volt-Ampere Reactive

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VB

Design speed for maximum gust intensity.

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VC

Design cruising speed.

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VD

Design diving speed.

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VDF /MDF

Demonstrated flight diving speed.

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VEF

The speed at which the critical engine is assumed to fail during takeoff.

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VF

Design flap speed.

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VFC /MFC

Maximum speed for stability characteristics.

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VFE

Maximum flap extended speed

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VFE

Maximum flap extended speed.

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VFOM

Vertical Figure of Merit

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VFR

Visual flight rules.

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VFR

Visual Flight Rules

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VFR

Visual Flight Rules

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VFTO

Final takeoff speed.

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VH

Maximum speed in level flight at maximum continuous power

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VH

Maximum speed in level flight with maximum continuous power.

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VHF

Very high frequency.

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VHF

Very high frequency.

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VHF (vhf)

Very High Frequency (30 to 300 MHz)

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VIFF

Vectoring in forward flight. A method of enhancing the maneuverability of an airplane by vectoring the exhaust gases and/or fan-discharge air to produce thrust components not parallel to the longitudinal axis of the aircraft.

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VLE

Maximum landing gear extended speed.

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VLO

Maximum landing gear operating speed.

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VLOF

Lift-off speed.

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VLSI

Very Large-Scale Integration

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VMC

Minimum control speed with the critical engine inoperative.

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VMO

Maximum operating limit speed

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VMO /MMO

Maximum operating limit speed.

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VMU

Minimum unstick speed.

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VNE

Never-exceed speed. The maximum speed the aircraft is allowed to attain in any conditions of flight.

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VNE

Never-exceed speed

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VNE

Never-exceed speed.

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VNO

Maximum structural cruising speed.

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VOR

Very high frequency Omni Range navigation.

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VOR

VHF Omnirange; Visual Omnirange

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VOR

Very High Frequency Omnidirectional Range

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VOR

Very high frequency omnirange station.

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VORTAC

An electronic navigation system that contains both a VOR and a TACAN facility.

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VORTAC

VOR Tactical Air Navigation

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VORTAC

Collocated VOR and TACAN.

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VR

Voltage Regulator

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VR

Rotation speed.

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VREF

Reference landing speed.

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VRMS

Volts Root Means Square

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VS

Stalling speed or the minimum steady flight speed at which the airplane is controllable

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VS0

The stalling speed or the minimum steady flight speed in the landing configuration.

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VS1

The stalling speed or the minimum steady flight speed obtained in a specific configuration.

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VSA

Visual Separation on Approach

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VSR

Reference stall speed.

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VSR1

Reference stall speed in a specific configuration.

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VSRO

Reference stall speed in the landing configuration.

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VSW

Speed at which onset of natural or artificial stall warning occurs.

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VTOSS

Takeoff safety speed for Category A rotorcraft.

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VX

Speed for best angle of climb.

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VY

Speed for best rate of climb

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VY

Speed for best rate of climb.

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