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which an aircraft is cleared when issued an air traffic
clearance.
(See ICAO term CLEARANCE LIMIT.)
CLEARANCE LIMIT [ICAO]- The point of which
an aircraft is granted an air traffic control clearance.
CLEARANCE VOID IF NOT OFF BY (TIME)-
Used by ATC to advise an aircraft that the departure
clearance is automatically canceled if takeoff is not
made prior to a specified time. The pilot must obtain
a new clearance or cancel his/her IFR flight plan if not
off by the specified time.
(See ICAO term CLEARANCE VOID TIME.)
CLEARANCE VOID TIME [ICAO]- A time
specified by an air traffic control unit at which a
clearance ceases to be valid unless the aircraft
concerned has already taken action to comply
therewith.
CLEARED APPROACH- ATC authorization for an
aircraft to execute any standard or special instrument
approach procedure for that airport. Normally, an
aircraft will be cleared for a specific instrument
approach procedure.
(See CLEARED (Type of) APPROACH.)
(See INSTRUMENT APPROACH
PROCEDURE.)
(Refer to 14 CFR Part 91.)
(Refer to AIM.)
CLEARED (Type of) APPROACH- ATC authorization
for an aircraft to execute a specific instrument
approach procedure to an airport; e.g., “Cleared ILS
Runway Three Six Approach.”
(See APPROACH CLEARANCE.)
(See INSTRUMENT APPROACH
PROCEDURE.)
(Refer to 14 CFR Part 91.)
(Refer to AIM.)
CLEARED AS FILED- Means the aircraft is cleared
to proceed in accordance with the route of flight filed
in the flight plan. This clearance does not include the
altitude, DP, or DP Transition.
(See REQUEST FULL ROUTE CLEARANCE.)
(Refer to AIM.)
CLEARED FOR TAKEOFF- ATC authorization
for an aircraft to depart. It is predicated on known
traffic and known physical airport conditions.
CLEARED FOR THE OPTION- ATC authorization
for an aircraft to make a touch‐and‐go, low
approach, missed approach, stop and go, or full stop
landing at the discretion of the pilot. It is normally
used in training so that an instructor can evaluate a
student's performance under changing situations.
(See OPTION APPROACH.)
(Refer to AIM.)
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.
Pilot/Controller Glossary 2/14/08
PCG C-4
CLOSE PARALLEL RUNWAYS- Two parallel
runways whose extended centerlines are separated by
less than 4,300 feet, having a Precision Runway
Monitoring (PRM) system that permits simultaneous
independent ILS approaches.
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 involving
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.)
　
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