5 Terms
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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
User agency
Aviation; Air traffic control
The agency, organisation or military command responsible for the activity for which Class F airspace has been provided. The user agency shall be identified for Class F restricted areas, military ...
Uncertainty phase
Aviation; Air traffic control
(1) Canada: Phase that begins when: (a) with the exception of an arrival report, no communication has been received from an aircraft within 30 min after the time a communication should have been ...
Waypoint (WP)
Aviation; Air traffic control
A specified geographical location, defined by longitude and latitude, that is used in the definition of routes and terminal segments and for progress-reporting purposes.
Visual flight rules (VFR)
Aviation; Air traffic control
The rules that govern the procedures for conducting flight under visual conditions. Note: The abbreviation "VFR" is used by pilots and controllers to indicate a type of flight plan (FP) or weather ...
Vehicle control service (VCS)
Aviation; Air traffic control
The provision, by FSSs, of commands and instructions to control the movements of ground traffic on manoeuvring areas at designated uncontrolled aerodromes.
Under the hood
Aviation; Air traffic control
An expression indicating that the pilot is using a hood to restrict visibility outside the cockpit while simulating instrument flight. An instrument-rated pilot is required in the other control seat ...
Wide area augmentation system (WAAS)
Aviation; Air traffic control
U.S. and Canada: The augmentation to global positioning system (GPS) to meet en route and terminal navigation, non-precision approach and precision approach CAT I accuracy, integrity, continuity and ...
