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Clearance. ATC permission for an aircraft to proceed under specified traffic conditions within controlled airspace, for the purpose of providing separation between known aircraft.
Clearance delivery. Control tower position responsible for transmitting departure clearances to IFR flights.
Clearance limit. The fix, point, or location to which an aircraft is cleared when issued an air traffic clearance.
Clearance on request. An IFR clearance not yet received after filing a flight plan.
Clearance void time. Used by ATC, the time at which the departure clearance is automatically canceled if takeoff has not been made. The pilot must obtain a new clearance or cancel the IFR flight plan if not off by the specified time.
Clear ice. Glossy, clear, or translucent ice formed by the relatively slow freezing of large, supercooled water droplets.
Coefficient of lift. The ratio between lift pressure and dynamic pressure.
Cold front. The boundary between two air masses where cold air is replacing warm air.
Compass course. A true course corrected for variation and deviation errors.
Compass locator. A low-power, low- or medium-frequency (L/MF) radio beacon installed at the site of the outer or middle marker of an ILS.
Compass rose. A small circle graduated in 360° increments, to show direction expressed in degrees.
Complex aircraft. An aircraft with retractable landing gear, flaps, and a controllable pitch propeller.
Compressor pressure ratio. The ratio of compressor discharge pressure to compressor inlet pressure.
Compressor stall. In gas turbine engines, a condition in an axial-flow compressor in which one or more stages of rotor blades fail to pass air smoothly to the succeeding stages. A stall condition is caused by a pressure ratio that is incompatible with the engine rpm. Compressor stall will be indicated by a rise in exhaust temperature or rpm fluctuation, and if allowed to continue, may result in flameout and physical damage to the engine.
Computer navigation fix. A point used to define a navigation track for an airborne computer system such as GPS or FMS.
Concentric rings. Dashed-line circles depicted in the plan view of IAP charts, outside of the reference circle, that show en route and feeder facilities.
Condensation. A change of state of water from a gas (water vapor) to a liquid.
Condensation nuclei. Small particles of solid matter in the air on which water vapor condenses.
Cone of confusion. A cone-shaped volume of airspace directly above a VOR station where no signal is received, causing the CDI to fluctuate.
G-8
Configuration. This is a general term, which normally refers to the position of the landing gear and flaps.
Constant-speed propeller. A controllable-pitch propeller whose pitch is automatically varied in flight by a governor to maintain a constant rpm in spite of varying air loads.
Continuous flow oxygen system. System that supplies a constant supply of pure oxygen to a rebreather bag that dilutes the pure oxygen with exhaled gases and thus supplies a healthy mix of oxygen and ambient air to the mask. Primarily used in passenger cabins of commercial airliners.
Control and performance. A method of attitude instrument flying in which one instrument is used for making attitude changes, and the other instruments are used to monitor the progress of the change.
Control display unit. A display interfaced with the master computer, providing the pilot with a single control point for all navigations systems, thereby reducing the number of required flight deck panels.
Controllability. A measure of the response of an aircraft relative to the pilot’s flight control inputs.
Controlled airspace. An airspace of defined dimensions within which ATC service is provided to IFR and VFR flights in accordance with the airspace classification. It includes Class A, Class B, Class C, Class D, and Class E airspace.
Control pressures. The amount of physical exertion on the control column necessary to achieve the desired attitude.
Convective weather. Unstable, rising air found in cumiliform clouds.
Convective SIGMET. Weather advisory concerning convective weather significant to the safety of all aircraft, including thunderstorms, hail, and tornadoes.
Conventional landing gear. Landing gear employing a third rear-mounted wheel. These airplanes are also sometimes referred to as tailwheel airplanes.
Coordinated flight. Flight with a minimum disturbance of the forces maintaining equilibrium, established via effective control use.
COP. See changeover point.
Coriolis illusion. The illusion of rotation or movement in an entirely different axis, caused by an abrupt head movement, while in a prolonged constant-rate turn that has ceased to stimulate the brain’s motion sensing system.
Coupled ailerons and rudder. Rudder and ailerons are connected with interconnected springs in order to counteract adverse yaw. Can be overridden if it becomes necessary to slip the aircraft.
　
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