Pilot/Controller Glossary

4/20/23

PCG C

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CLEARANCE LIMIT [ICAO]

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 The point to which an aircraft is granted an air traffic control clearance.

CLEARANCE VOID IF NOT OFF BY (TIME)

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Used by ATC to advise an aircraft that the departure release

is automatically canceled if takeoff is not made prior to a specified time. The expiration of a clearance void time
does not cancel the departure clearance or IFR flight plan. It withdraws the pilot’s authority to depart IFR until
a new departure release/release time has been issued by ATC. 

Pilots who choose to depart VFR after their

clearance void time has expired should not depart using the previously assigned IFR transponder code.

(See ICAO term CLEARANCE VOID TIME.)

CLEARANCE VOID TIME [ICAO]

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 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 APPROACH

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ATC 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 CLEARED (Type of) APPROACH.)
(See INSTRUMENT APPROACH PROCEDURE.)
(Refer to 14 CFR Part 91.)
(Refer to AIM.)

CLEARED (Type of) APPROACH

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ATC authorization for an aircraft to execute a specific instrument approach

procedure to an airport; e.g., “Cleared ILS Runway Three Six Approach.”

(See APPROACH CLEARANCE.)
(See INSTRUMENT APPROACH PROCEDURE.)
(Refer to 14 CFR Part 91.)
(Refer to AIM.)

CLEARED AS FILED

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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, DP, or DP Transition.

(See REQUEST FULL ROUTE CLEARANCE.)
(Refer to AIM.)

CLEARED FOR TAKEOFF

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ATC authorization for an aircraft to depart. It is predicated on known traffic and

known physical airport conditions.

CLEARED FOR THE OPTION

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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. It is normally used in training
so that an instructor can evaluate a student’s performance under changing situations. Pilots should advise ATC
if they decide to remain on the runway, of any delay in their stop and go, delay clearing the runway, or are unable
to comply with the instruction(s).

(See OPTION APPROACH.)
(Refer to AIM.)

CLEARED THROUGH

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ATC authorization for an aircraft to make intermediate stops at specified airports

without refiling a flight plan while en route to the clearance limit.

CLEARED TO LAND

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ATC authorization for an aircraft to land. It is predicated on known traffic and known

physical airport conditions.

CLEARWAY

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 An area beyond the takeoff runway under the control of airport authorities within which terrain

or fixed 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 certificated.

(Refer to 14 CFR Part 1.)