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Terms for subject Aviation (1801 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."
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.
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
chaff	Radar confusion reflectors, which consist of thin, narrow metallic strips of various lengths and frequency responses, used to reflect echoes for confusion purposes
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
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
Chase aircraft	An aircraft flown in proximity to another aircraft, normally to observe its performance during training or testing
circling minimums	The minimum descent altitude (MDA) and visibility required for the circling procedure
circuit	A communication system that includes all the direct system channels between two points
circuit	The specified path to be flown by aircraft operating in the vicinity of an aerodrome
CIRVIS	A plan developed for the reporting of vital intelligence sightings to extend the early-warning coverage of the North American continent
civil operations	civ operations	Michae­lBurov
clear air turbulence	Turbulence encountered in air where no clouds are present. This expression is commonly applied to high- level turbulence associated with wind shear (WS) CAT is often encountered in the vicinity of the jet stream.
clearance	An authorization issued by an ATC unit for an aircraft to proceed within controlled airspace in accordance with the conditions specified by that unit