The air
traffic control center at Memphis (1965).
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Air
Traffic Control
Air
traffic control involves monitoring the movements of all aircraft, both
in the air and on the ground, in the vicinity of an airport. Its main
purpose is to keep aircraft safely separated to prevent accidents. Air
traffic control is needed so that the risk of collision becomes extremely
low. This can be achieved only by strictly following procedures that are
set out and monitored by air traffic controllers, individuals who direct
air traffic within assigned airspace and control moving aircraft and service
vehicles at airports.
In
flight, an aircraft follows en route air traffic control instructions
as it flies through successive flight information regions. When it approaches
an airport for landing, the aircraft enters the terminal control area
where it is monitored by controllers using radar and who constantly tell
pilots how to navigate within the area. Controllers also monitor the aircraft
all the way to the ground and tell the pilot how to maneuver on the ground
to avoid collisions on the ground of the airfield and how to reach its
final location where passengers can disembark. Departing aircraft go through
a reverse procedure. Overall, the degree of control depends greatly on
the weather conditions. In general, the better the weather, then the less
the control.
The
International Civil Aviation Organization (ICAO), defines the objectives
of air traffic control as:
-
Preventing
collisions between aircraft in flight
-
Preventing
collisions between aircraft on the maneuvering area of an airport
and obstructions on that area
-
Expediting
and maintaining an orderly flow of air traffic
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Providing
advice and information useful for the safe and efficient conduct of
flights
-
Notifying
appropriate organizations regarding aircraft in need of search and
rescue aid, and assisting such organizations as required
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