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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 8/5/04
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 radar display that provides a presentation of
primary, beacon radar videos, and alphanumeric data
from an Air Traffic Control radar system, which is
certified by the FAA to provide radar services.
Examples include Digital Bright Radar Indicator
Tower Equipment (DBRITE), Tower Display
Workstation (TDW) and BRITE.
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 be authorized
and under the control of the appropriate air traffic
control facility. Weather minimums required are
depicted on the chart.
CHASE− An aircraft flown in proximity to another
aircraft normally to observe its performance during
training or testing.
CHASE AIRCRAFT−
(See CHASE.)
CIRCLE-TO-LAND MANEUVER− A maneuver
initiated by the pilot to align the aircraft with a
runway for landing when a straight-in landing from
an instrument approach is not possible or is not
desirable. At tower controlled airports, this maneuver
is made only after ATC authorization has been
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