COORDINATES (JCS, NATO) - Linear or angular quantities which designate the position that a point occupies in a given reference frame or system. Also used as a general term to designate the particular kind of reference frame or system such as plane rectangular coordinates or spherical coordinates.
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.
CORRECTION (P/CG, JCS, NATO) - 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 Above Ground Level (See Autoland Approach).
COURSE (P/CG) -
(1)
The intended direction of flight in the horizontal plane measured in degrees from North.
(2)
The Instrument Landing System localizer signal pattern usually specified as front course or back course.
(3)
The intended track along a straight, curved or segmented Microwave Landing System path. (See Bearing, Radial, Instrument Landing System and Microwave Landing System)
COURSE (JCS) - The intended direction of movement in the horizontal plane.
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 Air Traffic Control when a specific altitude restriction at a specified fix is required.
CROSS (FIX) AT OR ABOVE (ALTITUDE) - Used by Air Traffic Control 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 Assignment, Altitude Restriction)
CROSS (FIX) AT OR BELOW (ALTITUDE) - Used by Air Traffic Control 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 Minimum IFR Altitude, Altitude Restriction) (Refer to Federal Air Regulations Part 91)
CROSSWIND -
(1)
When used concerning the traffic pattern, the word means “crosswind leg”. (See Traffic Pattern)
(2)
When used concerning wind condition, 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.
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