This information can also be found in the AIM and General Planning, Chapter Two.
AIRPORT SURVEILLANCE RADAR (ASR) APPROACH Radar providing position of
aircraft by azimuth and range data without elevation data. It is designed for a maximum range of
60 miles. Used for terminal approach control. Also used for Surveillance approaches. The ASR
approach is conducted in accordance with directions issued by a controller referring only to the
surveillance display. Also see GCA.
AIR ROUTE TRAFFIC CONTROL CENTER (ARTCC) A facility established to provide
traffic control service to Instrument Flight Rules (IFR) flights operating within controlled
airspace and principally during the enroute phase of flight.
AIR TRAFFIC CONTROL CLEARANCE Authorization by air traffic control facilities for
an aircraft to proceed under specified traffic conditions within controlled airspace.
ALTITUDE RESTRICTION An altitude or altitudes, stated in the order flown, which are to
be maintained until reaching a specific point or time. Altitude restrictions may be issued by
ATC due to traffic, terrain, or other airspace considerations.
APPROACH CONTROL FACILITY A terminal Air Traffic Control facility that provides
approach control service in a terminal area, (NOTE: Approach control service is provided by an
approach control facility for arriving and departing aircraft. At some airports not served by an
approach control facility, the Air Route Traffic Control Center provides limited approach control
AUTOMATIC TERMINAL INFORMATION SERVICE (ATIS) The continuous broadcast
of recorded non-control information in selected terminal areas. Its purpose is to improve
controller effectiveness and to relieve frequency congestion by automating the repetitive
transmission of essential but routine information.
CEILING The height above the earth's surface of the lowest layer of clouds or obscuring
phenomena that is reported as "broken," "overcast," or "obscuration," and not classified as "thin"
CIRCLETOLAND MANEUVER A maneuver initiated by the pilot to align the aircraft
with a runway for landing when a straightin landing from an instrument approach is not
possible or is not desirable.
CLEARANCE LIMIT The fix to which an aircraft is cleared.
CLEARED FOR THE OPTION ATC authorization for an aircraft to make a touchandgo,
low approach, Missed Approach, stop and go, or full stop landing at the discretion of the pilot.