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Pilot/Controller Glossary

3/29/18

PCG C−4

CLEARED THROUGH− ATC authorization for an

aircraft to make intermediate stops at specified

airports without refiling a flight plan while en route

to the clearance limit.

CLEARED TO LAND− ATC authorization for an

aircraft to land. It is predicated on known traffic and

known physical airport conditions.

CLEARWAY− An area beyond the takeoff runway

under the control of airport authorities within which

terrain or fixed obstacles may not extend above

specified limits. These areas may be required for

certain turbine-powered operations and the size and

upward slope of the clearway will differ depending on

when the aircraft was certificated.

(Refer to 14 CFR Part 1.)

CLIMB TO VFR− ATC authorization for an aircraft

to climb to VFR conditions within Class B, C, D, and

E surface areas when the only weather limitation is

restricted visibility. The aircraft must remain clear of

clouds while climbing to VFR.

(See SPECIAL VFR CONDITIONS.)
(Refer to AIM.)

CLIMBOUT− That portion of flight operation

between takeoff and the initial cruising altitude.

CLIMB VIA– An abbreviated ATC clearance that

requires compliance with the procedure lateral path,

associated speed restrictions, and altitude restrictions

along the cleared route or procedure.

CLOSE PARALLEL RUNWAYS− Two parallel

runways whose extended centerlines are separated by

less than 4,300 feet and at least 3000 feet (750 feet for

SOIA operations) for which ATC is authorized to

conduct simultaneous independent approach opera-

tions. PRM and simultaneous close parallel appear in

approach title. Dual communications, special pilot

training, an Attention All Users Page (AAUP), NTZ

monitoring by displays that have aural and visual

alerting algorithms are required. A high update rate

surveillance sensor is required for certain runway or

approach course spacing.

CLOSED RUNWAY− A runway that is unusable for

aircraft operations. Only the airport management/

military operations office can close a runway.

CLOSED TRAFFIC− Successive operations involv-

ing takeoffs and landings or low approaches where

the aircraft does not exit the traffic pattern.
CLOUD− A cloud is a visible accumulation of

minute water droplets and/or ice particles in the

atmosphere above the Earth’s surface. Cloud differs

from ground fog, fog, or ice fog only in that the latter

are, by definition, in contact with the Earth’s surface.
CLT−

(See CALCULATED LANDING TIME.)

CLUTTER− In radar operations, clutter refers to the

reception and visual display of radar returns caused

by precipitation, chaff, terrain, numerous aircraft

targets, or other phenomena. Such returns may limit

or preclude ATC from providing services based on

radar.

(See CHAFF.)
(See GROUND CLUTTER.)
(See PRECIPITATION.)
(See TARGET.)
(See ICAO term RADAR CLUTTER.)

CMNPS−

(See CANADIAN MINIMUM NAVIGATION

PERFORMANCE SPECIFICATION AIRSPACE.)

COASTAL FIX− A navigation aid or intersection

where an aircraft transitions between the domestic

route structure and the oceanic route structure.
CODES− The number assigned to a particular

multiple pulse reply signal transmitted by a

transponder.

(See DISCRETE CODE.)

COLD TEMPERATURE COMPENSATION− An

action on the part of the pilot to adjust an aircraft’s

indicated altitude due to the effect of cold

temperatures on true altitude above terrain versus

aircraft indicated altitude. The amount of

compensation required increases at a greater rate with

a decrease in temperature and increase in height

above the reporting station.
COLLABORATIVE TRAJECTORY OPTIONS

PROGRAM (CTOP)− CTOP is a traffic management

program administered by the Air Traffic Control

System Command Center (ATCSCC) that manages

demand through constrained airspace, while consid-

ering operator preference with regard to both route

and delay as defined in a Trajectory Options Set

(TOS).

Pilot/Controller Glossary

2/28/19