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Pilot/Controller Glossary

VORTICES

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 Circular patterns of air created by the movement of an airfoil through
the air when generating lift.

As an airfoil moves through the atmosphere in sustained flight, an area
of area of low pressure is created above

it. The air flowing from the high pressure area to the low pressure
areround and about the tips of the airfoil

tends to roll up into two rapidly rotating vortices, cylindrical in
shape. These vortices are the most predominant

parts of aircraft wake turbulence and their rotational force is
dependent upon the wing loading, gross weight,

and speed of the generating aircraft. The vortices from medium to super
aircraft can be of extremely high velocity

and hazardous to smaller aircraft.

(See AIRCRAFT CLASSES.)
(See WAKE TURBULENCE.)
(Refer to AIM.)

VOT

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 A ground facility which emits a test signal to check VOR receiver
accuracy. Some VOTs are available

to the user while airborne, and others are limited to ground use only.

(See CHART SUPPLEMENT.)
(Refer to 14 CFR Part 91.)
(Refer to AIM.)

VR

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(See VFR MILITARY TRAINING ROUTES.)

VSCS

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(See VOICE SWITCHING AND CONTROL SYSTEM.)

VTOL AIRCRAFT

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(See VERTICAL TAKEOFF AND LANDING AIRCRAFT.)

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