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Pilot/Controller Glossary

3/29/18

PCG C−3

CLASS D AIRSPACE−

(See CONTROLLED AIRSPACE.)

CLASS E AIRSPACE−

(See CONTROLLED AIRSPACE.)

CLASS G AIRSPACE− Airspace that  is not

designated in 14 CFR Part 71 as Class A, Class B,

Class C, Class D, or Class E controlled airspace is

Class G (uncontrolled) airspace.

(See UNCONTROLLED AIRSPACE.)

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.)
(See JET STREAM.)

CLEAR OF THE RUNWAY−

a. Taxiing aircraft, which is approaching a

runway, is clear of the runway when all parts of the

aircraft are held short of the applicable runway

holding position marking.

b. A pilot or controller may consider an aircraft,

which is exiting or crossing a runway, to be clear of

the runway when all parts of the aircraft are beyond

the runway edge and there are no restrictions to its

continued movement beyond the applicable runway

holding position marking.

c. Pilots and controllers shall exercise good

judgement to ensure that adequate separation exists

between all aircraft on runways and taxiways at

airports with inadequate runway edge lines or

holding position markings.

CLEARANCE−

(See AIR TRAFFIC CLEARANCE.)

CLEARANCE LIMIT− The fix, point, or location to

which an aircraft is cleared when issued an air traffic

clearance.

(See ICAO term CLEARANCE LIMIT.)

CLEARANCE LIMIT [ICAO]− The point to which

an aircraft is granted an air traffic control clearance.

CLEARANCE VOID IF NOT OFF BY (TIME)−

Used by ATC to advise an aircraft that the departure

clearance is automatically canceled if takeoff is not

made prior to a specified time. The pilot must obtain

a new clearance or cancel his/her IFR flight plan if not

off by the specified time.

(See ICAO term CLEARANCE VOID 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 APPROACH− 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− ATC authoriza-

tion 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− 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−  ATC authorization

for an aircraft to depart. It is predicated on known

traffic and known physical airport conditions.
CLEARED FOR THE OPTION− ATC authoriza-

tion 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.)

2/28/19

Pilot/Controller Glossary