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Pilot/Controller Glossary

3/29/18

PCG C−8

pilots using ground or satellite-based radio relay

stations.

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 METEOROLOG-

ICAL 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−

 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

non-precision 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.

COURSE−

a. 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.

(See BEARING.)
(See INSTRUMENT 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.)

CROSSWIND−

a. 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 compo-

nent measured in knots at 90 degrees to the

longitudinal axis of the runway.

Pilot/Controller Glossary

9/13/18