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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 PERFORMANCE
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 unscheduled
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.)
Pilot/Controller Glossary 2/14/08
PCG C-2
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 Flyways
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.
CHARTED VISUAL FLIGHT PROCEDURE
APPROACH- An approach conducted while
operating on an instrument flight rules (IFR) flight
plan which authorizes the pilot of an aircraft to
proceed visually and clear of clouds to the airport via
visual landmarks and other information depicted on
a charted visual flight procedure. This approach must
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