Pilot/Controller Glossary

airspace begins at 14,500 MSL over the United
States, including that airspace overlying the waters
within 12 nautical miles of the coast of the 48
contiguous States and Alaska, up to, but not
including 18,000 feet MSL, and the airspace above
FL 600.
CONTROLLED AIRSPACE [ICAO]- An airspace
of defined dimensions within which air traffic control
service is provided to IFR flights and to VFR flights
in accordance with the airspace classification.
Note: Controlled airspace is a generic term which
covers ATS airspace Classes A, B, C, D, and E.

CONTROLLED TIME OF ARRIVAL- Arrival time
assigned during a Traffic Management Program. This
time may be modified due to adjustments or user
options.
CONTROLLER-

equipment onboard the aircraft or vehicle to be
detected.
(See AUTOMATIC DEPENDENT
SURVEILLANCE-BROADCAST.)
(See NON-COOPERATIVE SURVEILLANCE.)
(See RADAR.)
(See WIDE AREA MULTILATERATION.)

COORDINATES- The intersection of lines of
reference, usually expressed in degrees/minutes/
seconds of latitude and longitude, used to determine
position or location.
COORDINATION FIX- The fix in relation to which
facilities will handoff, transfer control of an aircraft,
or coordinate flight progress data. For terminal
facilities, it may also serve as a clearance for arriving
aircraft.

yutsrponm

(See AIR TRAFFIC CONTROL SPECIALIST.)

COPTER-
(See HELICOPTER.)

CONTROLLER [ICAO]- A person authorized to
provide air traffic control services.

CORRECTION- An error has been made in the
transmission and the correct version follows.

CONTROLLER
PILOT
DATA
LINK
COMMUNICATIONS (CPDLC)- A two-way
digital communications system that conveys textual
air traffic control messages between controllers and
pilots using ground or satellitebased radio relay
stations.

COUPLED APPROACH- An instrument approach
performed by the aircraft autopilot, and/or visually
depicted on the flight director, which is receiving
position information and/or steering commands from
onboard navigational equipment. In general, coupled
nonprecision approaches must be flown manually
(autopilot disengaged) at altitudes lower than 50 feet
AGL below the minimum descent altitude, and
coupled precision approaches must be flown
manually (autopilot disengaged) below 50 feet AGL
unless authorized to conduct autoland operations.
Coupled instrument approaches are commonly flown
to the allowable IFR weather minima established by
the operator or PIC, or flown VFR for training and
safety.

CONVECTIVE SIGMET- A weather advisory
concerning convective weather significant to the
safety of all aircraft. Convective SIGMETs are issued
for tornadoes, lines of thunderstorms, embedded
thunderstorms of any intensity level, areas of
thunderstorms greater than or equal to VIP level 4
with an area coverage of 4/10 (40%) or more, and hail
3/ inch or greater.
(See AIRMET.)
(See CWA.)
(See SAW.)
(See SIGMET.)
(Refer to AIM.)

CONVECTIVE SIGNIFICANT METEOROLOG
ICAL INFORMATION-
(See CONVECTIVE SIGMET.)

COOPERATIVE SURVEILLANCE- Any surveil
lance system, such as secondary surveillance radar
(SSR), wide-area multilateration (WAM), or ADS-
B, that is dependent upon the presence of certain

COUPLED SCHEDULING (CS)/ EXTENDED
METERING (XM)- Adds additional Constraint
Satisfaction Points for metered aircraft along their
route. This provides the ability to merge flows
upstream from the meter fix and results in a more
optimal distribution of delays over a greater distance
from the airport, increased meter list accuracy, and
more accurate delivery to the meter fix.
COURSE-
a. The intended direction of flight in the horizontal
plane measured in degrees from north.