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Terms for subject Aviation (2593 entries)

ceiling	The lesser of: (a) the height above ground or water of the base of the lowest layer of cloud covering more than half the sky; or (b) the vertical visibility in a surface-based layer which completely obscures the sky
ceiling	The height above the ground or water of the base of the lowest layer of cloud below 6000 m (20 000 ft) covering more than half the sky
ceiling	The heights above the earth's surface of the lowest layer of clouds or obscuring phenomena that is reported as "broken," "overcast," or "obscuration," and not classified as "thin" or "partial."
Celsius temperature	The Celsius temperature is equal to the difference t°C = T － T0 between two thermodynamic temperatures T and T0 where T0 equals 273.15 kelvin.
Center Weather Advisory	An unscheduled weather advisory issued by Center Weather Service Unit meteorologists for ATC use to alert pilots of existing or anticipated adverse weather conditions within the next 2 hours. A CWA may modify or redefine a SIGMET.
CG limit	center-of-gravity limit	bonly
Central Altitude Reservation Function	The service provided by the altitude reservation East (Gander) and the altitude reservation West (Edmonton) in coordination with area control centres (ACC) in providing reserved altitude for specified air operations in controlled airspace, and in providing information concerning these reservations and military activity areas in controlled and uncontrolled airspace
Central Flow Control Function	Unit that is responsible for coordination and approval of all major intercenter [s/c] flow control restrictions on a system basis in order to obtain maximum utilization of the airspace
centreline fix	A fix and/or waypoint located on the final approach course of an instrument approach procedure (IAP) prior to the point of glide path (GP) intercept on a precision approach procedure; (b) prior to the final approach fix (FAF) on a non-precision approach procedure that has a designated FAF; (c) prior to any stepdown fixes on a non-precision approach procedure with designated fixes but no FAF; or (d) at a point that would permit a normal landing approach on a non-precision approach procedure with no FAF or stepdown fixes. • other expression: centreline fix " see also: instrument approach waypoints
certified aerodrome	An aerodrome whose operator has been granted an aerodrome certificate.
certify as airworthy	To certify that an aircraft or parts thereof comply with current airworthiness requirements after maintenance has been performed on the aircraft or parts thereof.
CFF	Composite force training or con formal fuel tank
CG limit	center-of-gravity limit	bonly
chaff	Radar confusion reflectors, which consist of thin, narrow metallic strips of various lengths and frequency responses, used to reflect echoes for confusion purposes
chandelle turn	A near vertical turn up, used to attack a high bandit from a medium to front quarter aspect
change-over point	A point along the route or airway segment between two adjacent navigation facilities where the change- over in navigation guidance should occur
change-over point	The point at which an aircraft navigating on an ATS route segment defined by reference to very high frequency omnidirectional radio ranges is expected to transfer its primary navigational reference from the facility behind the aircraft to the next facility ahead of the aircraft.
channel	A single means of direct fixed-service communication between two points
charted visual approach	An approach wherein a radar-controlled aircraft on an IFR flight plan (FP) operating in VFR conditions and having an ATC authorization, may proceed to the airport of intended landing via visual landmarks and altitudes depicted on a published visual approach chart
charted visual flight procedure approach	An approach wherein a radar-controlled aircraft on an IFR flight plan (FP) operating in VFR conditions and having an ATC authorization, may proceed to the airport of intended landing via visual landmarks and altitudes depicted on a published visual approach chart