Air traffic control

Air traffic control

An in-airport service that facilitates the safe and orderly movement of aircrafts within and between airports, achieved by interpreting data from radar and weather devices, and by maintaining contact with pilots.

Industry: Aviation

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Air traffic control

en-route alternate aerodrome

Aviation; Air traffic control

An aerodrome at which an aircraft would be able to land after experiencing an abnormal or emergency condition while en route.

vertical separation

Aviation; Air traffic control

The separation between aircraft expressed in units of vertical distance.

visual separation

Aviation; Air traffic control

A means used by controllers to separate aircraft operating in visual meteorolgical conditions (VMC). (a) VFR—The controller, having determined that a potential conflict exists, issues clearances, ...

upwind leg

Aviation; Air traffic control

A flight path parallel to the landing runway in the direction of landing.

wind direction indicator

Aviation; Air traffic control

(1) An indicator that is in the form of a truncated cone made of fabric and that is not less than 12 ft long and, at the larger end, not less than 3 ft in diameter, so constructed as to give a clear ...

visual approach slope indicator system (VASIS)

Aviation; Air traffic control

An approach slope indicator system consisting of four light units situated on the left side of the runway in the form of two wing bars referred to as the upwind and downwind wing bars. The aircraft ...

visual approach slope indicator systems

Aviation; Air traffic control

Aerodrome facilities, including mechanical and electro-optical devices, providing vertical visual approach slope guidance to aircraft during the approach to landing. Lighting facilities provide this ...