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CIRCLE TO RUNWAY (RUNWAY NUMBERED) - Used by Air Traffic Control to inform the pilot that he must circle to land because the runway in use is other than the runway aligned with the instrument approach procedure. When the direction of the circling maneuver in relation to the airport/runway is required, the controller will state the direction (eight cardinal compass points) and specify a left or right downwind or base leg as appropriate; e.g., "Cleared VOR Runway 36 approach circle to Runway 22" or "Circle Northwest of the airport for a right downwind to Runway 22". (See Circle to Land maneuver, Landing Minimums)
CIRCLING APPROACH - (See Circle-to-Land Maneuver)
CIRCLING MINIMA - (See Landing Minimums) CLEAR-AIR TURBULENCE/CAT - Turbulence encountered in air where no clouds are present. This term is commonly applied to high-level turbulence associated with wind shear. CAT is often encountered in the vicinity of the jet stream. (See Wind Shear, Jet Stream)
CLEARANCE - (See Air Traffic Clearance)
CLEARANCE LIMIT (P/CG) - The fix, point, or location to which an aircraft is cleared when issued an air traffic clearance.
CLEARANCE LIMIT (ICAO) - The point to which an aircraft is granted an Air Traffic Control clearance.
CLEARANCE VOID IF NOT OFF BY (TIME) (P/CG) - Used by Air Traffic Control to advise an aircraft that the departure clearance is automatically cancelled if take-off is not made prior to a specified time. The pilot must obtain a new clearance or cancel his IFR flight plan if not off by the specified time.
CLEARANCE VOID TIME (ICAO) - A time specified by an Air Traffic Control unit at which a clearance ceases to be valid unless the aircraft concerned has already taken action to comply therewith.
CLEARED AS FILED - Means the aircraft is cleared to proceed in accordance with the route of flight filed in the flight plan. This clearance does not include the altitude, SID, or SID Transition. (See Request Full Route Clearance)
CLEARED FOR (TYPE OF) APPROACH - Air Traffic Control authorization for an aircraft to execute a specific instrument approach procedure to an airport; e.g., "Cleared for ILS Runway 36 approach." (See Instrument Approach Procedure, Approach Clearance) (Refer to Federal Air Regulations Part 91)
CLEARED FOR APPROACH - Air Traffic Control authorization for an aircraft to execute any standard or special instrument approach procedure for that airport. Normally, an aircraft will be cleared for a specific Instrument Approach Procedure. (See Instrument Approach Procedure, Cleared for (type of) Approach.) (Refer to Federal Air Regulations Part 91)
CLEARED FOR TAKE-OFF - Air Traffic Control authorization for an aircraft to depart. It is predicated on known traffic and known physical airport conditions.
CLEARED FOR THE OPTION - Air Traffic Control 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. It is normally used in training so that an instructor can evaluate a student's performance under changing situations. (See Option Approach)
CLEARED THROUGH - Air Traffic Control authorization for an aircraft to make intermediate stops at specified airports without refiling a flight plan while enroute to the clearance limit.
CLEARED TO LAND - Air Traffic Control authorization for an aircraft to land. It is predicated on known traffic and known physical airport conditions.
CLEARWAY - An area beyond the take-off runway under the control of airport authorities within which terrain or field obstacles may not extend above specified limits. These areas may be required for certain turbine-powered operations and the size and upward slope of the clearway will differ depending on when the aircraft was certified. (Refer to Federal Air Regulations Part 1)
CLIMBOUT - That portion of flight operation between take-off and the initial cruising altitude.

CLIMB RATES (USAF)
　
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