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Pilot/Controller Glossary

COUPLED SCHEDULING (CS)/ EXTENDED METERING (XM)

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 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

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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

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(See CONTROLLER PILOT DATA LINK COMMUNICATIONS.)

CPL [ICAO]

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(See ICAO term CURRENT FLIGHT PLAN.)

CREWMEMBER (UAS)

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 A person assigned to perform an operational duty. A UAS crewmember
includes the

remote pilot in command, the person manipulating the controls, and
visual observers but may also include other

persons as appropriate or required to ensure the safe operation of the
UAS (e.g., sensor operator, ground control

station operator).
CRITICAL ENGINE

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 The engine which, upon failure, would most adversely affect the
performance or handling

qualities of an aircraft.

CROSS (FIX) AT (ALTITUDE)

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Used by ATC when a specific altitude restriction at a specified fix is
required.

CROSS (FIX) AT OR ABOVE (ALTITUDE)

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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)

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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

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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

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 The wind component measured in knots at 90 degrees to the longitudinal
axis

of the runway.

CRUISE

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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:

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