approach control service
- Air traffic control service for arriving or departing controlled flights. It is provided by an aerodrome control tower or area control center when it is necessary or desirable to combine the functions of the approach control services with those of the aerodrome control service or the area control service under the responsibility of one unit. The service may also be provided by an approach control office when it is desirable or necessary to establish a separate unit. The ARTCC (air route traffic control center) provides limited approach control services at some airports not served by an approach control facility.
Aviation dictionary. 2014.
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