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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.)
Pilot/Controller Glossary 8/5/04
PCG C−4
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.
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.)
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.)
COMBINED CENTER-RAPCON− An air traffic
facility which combines the functions of an ARTCC
and a radar approach control facility.
(See AIR ROUTE TRAFFIC CONTROL
CENTER.)
(See RADAR APPROACH CONTROL
FACILITY.)
COMMON POINT− A significant point over which
two or more aircraft will report passing or have
reported passing before proceeding on the same or
diverging tracks. To establish/maintain longitudinal
separation, a controller may determine a common
point not originally in the aircraft’s flight plan and
then clear the aircraft to fly over the point.
(See SIGNIFICANT POINT.)
COMMON PORTION−
(See COMMON ROUTE.)
COMMON ROUTE− That segment of a North
American Route between the inland navigation
facility and the coastal fix.
OR
COMMON ROUTE− Typically the portion of a
RNAV STAR between the en route transition end
point and the runway transition start point; however,
the common route may only consist of a single point
that joins the en route and runway transitions.
COMMON TRAFFIC ADVISORY FREQUENCY
(CTAF)− A frequency designed for the purpose of
carrying out airport advisory practices while operating
to or from an airport without an operating control
tower. The CTAF may be a UNICOM, Multicom,
FSS, or tower frequency and is identified in appropriate
aeronautical publications.
(Refer to AC 90-42, Traffic Advisory Practices at
Airports Without Operating Control Towers.)
COMPASS LOCATOR− A low power, low or
medium frequency (L/MF) radio beacon installed at
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