Pilot/Controller Glossary

constrained airspace, while considering operator preference with regard to both route and delay as defined in a
Trajectory Options Set (TOS).
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-
(See SEGMENTS OF A SID/STAR)

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.
(See DESIGNATED COMMON TRAFFIC ADVISORY FREQUENCY (CTAF) AREA.)
(Refer to AC 90-66, Non-Towered Airport Flight Operations.)

COMMUNITY-BASED ORGANIZATION (CBO)- A membership-based entity, described under Section
501(a,c), whose mission is the furtherance of model aviation. (see also, 49 United States Code (USC) 44809
(h) and Advisory Circular (AC) 91-57).
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 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.)

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.