| "Clearance cancelled ..." |
An expression used in radiocommunication to indicate a time specified by an ATC unit at which a clearance ceases to be valid unless the aircraft concerned has already taken action to comply therewith |
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| "Clearance valid ..." |
An expression used in radiocommunication to indicate a departure time restriction issued to a pilot by ATC (either directly or through an authorized relay) when it is necessary to separate a departing aircraft from other traffic |
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| "Clearance void ..." |
An expression used in radiocommunication to indicate a time specified by an ATC unit at which a clearance ceases to be valid unless the aircraft concerned has already taken action to comply therewith |
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| "Cleared as filed" |
An expression indicating that the aircraft is cleared to proceed in accordance with the route of flight filed in the flight plan (FP) This clearance does not include the altitude, standard instrument departure (SID) or SID transition. |
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| "Cleared for takeoff" |
An expression used to indicate ATC authorization for an aircraft to depart. It is predicated on known aircraft and known physical airport conditions. |
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| "Cleared for the option" |
For an arriving aircraft: An expression used to indicate ATC authorization for an aircraft to make a touch-and-go, low approach, missed approach (MA) stop-and-go, or full-stop landing, at the discretion of the pilot. (b) For a departing aircraft: An expression used to indicate ATC authorization for an aircraft to execute manoeuvres other than a normal takeoff (e.g. an aborted takeoff) After such a manoeuvre, the pilot is expected to exit the runway by the most expeditious way rather than backtrack the runway. |
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| "Cleared for the option" |
For an arriving aircraft: An expression used to indicate ATC authorization for an aircraft to make a touch-and-go, low approach, missed approach, stop-and-go, or full-stop landing, at the discretion of the pilot |
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| "Cleared through" |
An expression used to indicate ATC authorization for an aircraft to make intermediate stops at specified airports without refiling a flight plan (FP) while en route to the clearance limit |
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| "Cleared to land" |
An expression used to indicate ATC authorization for an aircraft to land. It is predicated on known aircraft and known physical airport conditions. |
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| "Cleared via flight-planned route" |
An expression indicating that the aircraft is cleared to proceed in accordance with the route of flight filed in the flight plan (FP) This clearance does not include the altitude, standard instrument departure (SID) or SID transition. |
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| "Contact" |
An expression used in radiocommunication meaning "Visual contact has been established." |
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| "Contact..." |
An expression used in radiocommunication to establish communication with a facility |
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| "Correction" |
An expression used in radiocommunication meaning "An error has been made in this transmission (or in the message indicated) The correct version is ..." |
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| "Disregard" |
An expression used in radiocommunication meaning "Ignore or consider that transmission as not sent." |
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| "Estimated..." |
An expression used within ATS when communicating an ATC estimate |
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| "Estimating" |
An expression used within ATS when communicating a pilot estimate |
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| "Execute missed approach" |
An expression used to instruct a pilot executing an instrument approach procedure (IAP) to initiate a climb, continue inbound to the missed approach point (MAP) and execute the missed approach procedure as described on the instrument approach chart or as assigned by ATC |
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| "Expect approach clearance at..." |
An expression used in radiocommunication to indicate the time at which it is expected that an aircraft will be cleared to commence approach for a landing |
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| "Expect further clearance at..." |
An expression used in radiocommunication to indicate the time at which it is expected that further clearance will be issued to an aircraft |
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| "follow-me" vehicle |
A vehicle providing dedicated service to pilots when visibility conditions are below RVR 2600 |
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