CATCH POINT- A fix/waypoint that serves as a transition point from the high altitude waypoint navigation structure to an arrival procedure (STAR) or the low altitude ground-based navigation structure.
CEILING- The heights 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” or “partial.”
(See ICAO term CEILING.)
CEILING [ICAO]- The height above the ground or water of the base of the lowest layer of cloud below 6,000 meters (20,000 feet) covering more than half the sky.
CENRAP-
(See CENTER RADAR ARTS
PRESENTATION/PROCESSING.)
CENRAP‐PLUS-
(See CENTER RADAR ARTS
PRESENTATION/PROCESSING‐PLUS.)
CENTER-
(See AIR ROUTE TRAFFIC CONTROL
CENTER.)
CENTER'S AREA- The specified airspace within which an air route traffic control center (ARTCC) provides air traffic control and advisory service.
(See AIR ROUTE TRAFFIC CONTROL
CENTER.)
(Refer to AIM.)
CENTER RADAR ARTS PRESENTATION/ PROCESSING- A computer program developed to provide a back‐up system for airport surveillance radar in the event of a failure or malfunction. The program uses air route traffic control center radar for the processing and presentation of data on the ARTS IIA or IIIA displays.
CENTER RADAR ARTS PRESENTATION/ PROCESSING‐PLUS-A computer program developed to provide a back‐up system for airport surveillance radar in the event of a terminal secondary radar system failure. The program uses a combination of Air Route Traffic Control Center Radar and terminal airport surveillance radar primary targets displayed simultaneously for the processing and presentation of data on the ARTS IIA or IIIA displays.
CENTER TRACON AUTOMATION SYSTEM (CTAS)- A computerized set of programs designed to aid Air Route Traffic Control Centers and TRACONs in the management and control of air traffic.
CENTER WEATHER ADVISORY- An unsched-uled weather advisory issued by Center Weather Service Unit meteorologists for ATC use to alert pilots of existing or anticipated adverse weather conditions within the next 2 hours. A CWA may modify or redefine a SIGMET.
(See AWW.)
(See AIRMET.)
(See CONVECTIVE SIGMET.)
(See SIGMET.)
(Refer to AIM.)
CENTRAL EAST PACIFIC-An organized route system between the U.S. West Coast and Hawaii.
CEP-
(See CENTRAL EAST PACIFIC.)
CERAP-
(See COMBINED CENTER‐RAPCON.)
CERTIFIED TOWER RADAR DISPLAY (CTRD)-A FAA radar display certified for use in the NAS.
CFR-
(See CALL FOR RELEASE.)
CHAFF- Thin, narrow metallic reflectors of various lengths and frequency responses, used to reflect radar energy. These reflectors when dropped from aircraft and allowed to drift downward result in large targets on the radar display.
CHARTED VFR FLYWAYS- Charted VFR Fly-ways are flight paths recommended for use to bypass areas heavily traversed by large turbine‐powered aircraft. Pilot compliance with recommended flyways and associated altitudes is strictly voluntary. VFR Flyway Planning charts are published on the back of existing VFR Terminal Area charts.
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