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messages between controllers and pilots.
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
3/4 inch or greater.
(See AIRMET.)
(See AWW.)
(See CWA.)
(See SIGMET.)
(Refer to AIM.)
CONVECTIVE SIGNIFICANT METEOROLOGICAL
INFORMATION-
(See CONVECTIVE SIGMET.)
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.
COPTER-
(See HELICOPTER.)
CORRECTION- An error has been made in the
transmission and the correct version follows.
COUPLED APPROACH- A coupled approach is an
instrument approach performed by the aircraft
autopilot which is receiving position information
and/or steering commands from onboard navigation
equipment. In general, coupled nonprecision approaches
must be discontinued and flown manually
at altitudes lower than 50 feet below the minimum
descent altitude, and coupled precision approaches
must be flown manually below 50 feet AGL.
Note:Coupled and autoland approaches are flown
in VFR and IFR. It is common for carriers to require
their crews to fly coupled approaches and autoland
approaches (if certified) when the weather
conditions are less than approximately 4,000 RVR.
(See AUTOLAND APPROACH.)
COURSEa.
The intended direction of flight in the horizontal
plane measured in degrees from north.
b. The ILS localizer signal pattern usually
specified as the front course or the back course.
Pilot/Controller Glossary 2/14/08
PCG C-8
c. The intended track along a straight, curved, or
segmented MLS path.
(See BEARING.)
(See INSTRUMENT LANDING SYSTEM.)
(See MICROWAVE LANDING SYSTEM.)
(See RADIAL.)
CPDLC-
(See CONTROLLER PILOT DATA LINK
COMMUNICATIONS.)
CPL [ICAO]-
(See ICAO term CURRENT FLIGHT PLAN.)
CRITICAL ENGINE- The engine which, upon
failure, would most adversely affect the performance
or handling qualities of an aircraft.
CROSS (FIX) AT (ALTITUDE)- Used by ATC
when a specific altitude restriction at a specified fix
is required.
CROSS (FIX) AT OR ABOVE (ALTITUDE)- Used
by ATC when an altitude restriction at a specified fix
is required. It does not prohibit the aircraft from
crossing the fix at a higher altitude than specified;
however, the higher altitude may not be one that will
violate a succeeding altitude restriction or altitude
assignment.
(See ALTITUDE RESTRICTION.)
(Refer to AIM.)
CROSS (FIX) AT OR BELOW (ALTITUDE)-
Used by ATC when a maximum crossing altitude at
a specific fix is required. It does not prohibit the
aircraft from crossing the fix at a lower altitude;
however, it must be at or above the minimum IFR
altitude.
(See ALTITUDE RESTRICTION.)
(See MINIMUM IFR ALTITUDES.)
(Refer to 14 CFR Part 91.)
CROSSWINDa.
When used concerning the traffic pattern, the
word means “crosswind leg.”
(See TRAFFIC PATTERN.)
b. When used concerning wind conditions, the
word means a wind not parallel to the runway or the
path of an aircraft.
(See CROSSWIND COMPONENT.)
CROSSWIND COMPONENT- The wind component
measured in knots at 90 degrees to the
longitudinal axis of the runway.
CRUISE- Used in an ATC clearance to authorize a
pilot to conduct flight at any altitude from the
minimum IFR altitude up to and including the
altitude specified in the clearance. The pilot may
level off at any intermediate altitude within this block
of airspace. Climb/descent within the block is to be
made at the discretion of the pilot. However, once the
pilot starts descent and verbally reports leaving an
altitude in the block, he/she may not return to that
altitude without additional ATC clearance. Further, it
is approval for the pilot to proceed to and make an
approach at destination airport and can be used in
conjunction with:
a. An airport clearance limit at locations with a
standard/special instrument approach procedure. The
CFRs require that if an instrument letdown to an
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