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Aeronautical Information Manual (AIM), page 627

12/10/15 Pilot/Controller Glossary

C
CALCULATED LANDING TIME- A term that may
be used in place of tentative or actual calculated
landing time, whichever applies.
CALL FOR RELEASE- Wherein the overlying
ARTCC requires a terminal facility to initiate verbal
coordination to secure ARTCC approval for release
of a departure into the en route environment.
CALL UP- Initial voice contact between a facility
and an aircraft, using the identification of the unit
being called and the unit initiating the call.

(Refer to AIM.)

CANADIAN MINIMUM NAVIGATION PERFOR-

MANCE SPECIFICATION AIRSPACE- That

portion of Canadian domestic airspace within which

MNPS separation may be applied.

CARDINAL ALTITUDES- "Odd" or "Even"
thousand-foot altitudes or flight levels; e.g., 5,000,
6,000, 7,000, FL 250, FL 260, FL 270.
(See ALTITUDE.)
(See FLIGHT LEVEL.)
CARDINAL FLIGHT LEVELS-
(See CARDINAL ALTITUDES.)

CAT-
(See CLEAR-AIR TURBULENCE.)
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.)


PCG C-1

Page 627 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   626 -- Page 627 -- 628