| Canadian minimum navigation performance specifications |
Specifications relating to the navigation performance capability of aircraft operating in a specified portion of the Canadian Domestic Airspace (CDA) To comply with CMNPS, navigation performance must be such that: (a) the standard deviation of lateral track deviations is less than 6.3 NM; (b) the proportion of total flight time spent by aircraft 30 NM or more off the cleared track is less than 5.3 X 10 4 (i.e. less than 1 hr in about 2000 flight hours) and (c) the proportion of total flight time spent by aircraft at or between 50 and 70 NM off the cleared track is less than 13 X 10 5 (i.e. less than 1 hr in about 8000 flight hours) |
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| Canadian Runway Friction Index |
The average of the runway friction as measured by a mechanical or electronic decelerometer and reported through the Aircraft Movement Surface Condition Report |
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| CANPASS |
The expression used to denote a Canada Border Services Agency program for the telephone clearance of travellers on a Canadian- or U.S.-registered private aircraft, company aircraft, or small charter aircraft carrying no more than 15 passengers and arriving directly from the U.S. |
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| catalogue |
"you flew over the Arctic to catalogue Russian missile bases?" |
alexptyza |
| cautionary |
With respect to wake turbulence, information transmitted to an aircraft on one of the following: (a) the possible location of wake turbulence; or (b) the location of a heavy or medium aircraft behind which it will pass or follow |
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| CAVOK |
A term (pronounced "KAV-OH-KAY") derived from the words "ceiling and visibility OK," that may be used in air-ground communication when meteorological information is being transmitted to aircraft. CAVOK refers to the simultaneous occurrence, at an airport, of the following meteorological conditions: (a) no cloud below 5000 ft, or below the highest minimum sector altitude (MSA) whichever is higher, and no cumulonimbus; (b) a visibility of 6 SM or more; and (c) no precipitation, thunderstorm, shallow fog or drifting snow. |
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| 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 |
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| 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 |
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| 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." |
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| 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. |
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| 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 |
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| 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 |
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| 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 |
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| chaff |
Radar confusion reflectors, which consist of thin, narrow metallic strips of various lengths and frequency responses, used to reflect echoes for confusion purposes |
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| 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 |
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| channel |
A single means of direct fixed-service communication between two points |
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| 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 |
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| 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 |
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| Chase aircraft |
An aircraft flown in proximity to another aircraft, normally to observe its performance during training or testing |
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| circling minimums |
The minimum descent altitude (MDA) and visibility required for the circling procedure |
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