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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
the site of the outer or middle marker of an instrument
landing system (ILS). It can be used for navigation at
distances of approximately 15 miles or as authorized
in the approach procedure.
a. Outer Compass Locator (LOM)- A compass
locator installed at the site of the outer marker of an
instrument landing system.
(See OUTER MARKER.)
b. Middle Compass Locator (LMM)- A compass
locator installed at the site of the middle marker of an
instrument landing system.
(See MIDDLE MARKER.)
(See ICAO term LOCATOR.)
COMPASS ROSE- A circle, graduated in degrees,
printed on some charts or marked on the ground at an
airport. It is used as a reference to either true or
magnetic direction.
COMPLY WITH RESTRICTIONS- An ATC
instruction that requires an aircraft being vectored
2/14/08 Pilot/Controller Glossary
PCG C-5
back onto an arrival or departure procedure to comply
with all altitude and/or speed restrictions depicted on
the procedure. This term may be used in lieu of
repeating each remaining restriction that appears on
the procedure.
COMPOSITE FLIGHT PLAN- A flight plan which
specifies VFR operation for one portion of flight and
IFR for another portion. It is used primarily in
military operations.
(Refer to AIM.)
COMPOSITE ROUTE SYSTEM- An organized
oceanic route structure, incorporating reduced lateral
spacing between routes, in which composite
separation is authorized.
COMPOSITE SEPARATION- A method of separating
aircraft in a composite route system where, by
management of route and altitude assignments, a
combination of half the lateral minimum specified for
the area concerned and half the vertical minimum is
applied.
COMPULSORY REPORTING POINTS- Reporting
points which must be reported to ATC. They are
designated on aeronautical charts by solid triangles or
filed in a flight plan as fixes selected to define direct
routes. These points are geographical locations
which are defined by navigation aids/fixes. Pilots
should discontinue position reporting over compulsory
reporting points when informed by ATC that
their aircraft is in “radar contact.”
CONFLICT ALERT- A function of certain air traffic
control automated systems designed to alert radar
controllers to existing or pending situations between
tracked targets (known IFR or VFR aircraft) that
require his/her immediate attention/action.
(See MODE C INTRUDER ALERT.)
CONFLICT RESOLUTION- The resolution of
potential conflictions between aircraft that are radar
identified and in communication with ATC by
ensuring that radar targets do not touch. Pertinent
traffic advisories shall be issued when this procedure
is applied.
Note:This procedure shall not be provided utilizing
mosaic radar systems.
CONFORMANCE- The condition established when
an aircraft's actual position is within the conformance
region constructed around that aircraft at its position,
according to the trajectory associated with the
aircraft's Current Plan.
CONFORMANCE REGION- A volume, bounded
laterally, vertically, and longitudinally, within which
an aircraft must be at a given time in order to be in
conformance with the Current Plan Trajectory for that
aircraft. At a given time, the conformance region is
determined by the simultaneous application of the
lateral, vertical, and longitudinal conformance
bounds for the aircraft at the position defined by time
and aircraft's trajectory.
CONSOLAN- A low frequency, long‐distance
NAVAID used principally for transoceanic navigations.
CONTACTa.
Establish communication with (followed by the
name of the facility and, if appropriate, the frequency
to be used).
b. A flight condition wherein the pilot ascertains
the attitude of his/her aircraft and navigates by visual
reference to the surface.
(See CONTACT APPROACH.)
(See RADAR CONTACT.)
CONTACT APPROACH- An approach wherein an
aircraft on an IFR flight plan, having an air traffic
control authorization, operating clear of clouds with
at least 1 mile flight visibility and a reasonable
expectation of continuing to the destination airport in
those conditions, may deviate from the instrument
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