Do not use the word " ? " in conjunction with authorization for aircraft to taxi.

Do not use the word " ? " in conjunction with authorization for aircraft to taxi.

• A. Cleared
• B. Proceed
• C. Taxi
• D. Hold

Answer: (A)

The essential idea is using official phraseology to grant ground movement. When ATC authorizes an aircraft to taxi, the standard clearance is “cleared to taxi,” which uses the verb cleared to show permission has been granted and to indicate the pilot may start taxiing along the assigned taxi route. This makes the clearance clear and unambiguous, reducing confusion on the airport surface. Why this fits best: cleared explicitly conveys permission from air traffic control. It signals that the aircraft may begin moving on the ground under the controller’s jurisdiction and with the planned taxi path. The other options don’t offer the same clear authorization. Hold means stop and wait, not permission to move. Taxi alone is an instruction to move but doesn’t explicitly grant clearance. Proceed isn’t the standard taxi clearance and could be interpreted as continuing a previous clearance rather than starting a new taxi movement.

The essential idea is using official phraseology to grant ground movement. When ATC authorizes an aircraft to taxi, the standard clearance is “cleared to taxi,” which uses the verb cleared to show permission has been granted and to indicate the pilot may start taxiing along the assigned taxi route. This makes the clearance clear and unambiguous, reducing confusion on the airport surface.

Why this fits best: cleared explicitly conveys permission from air traffic control. It signals that the aircraft may begin moving on the ground under the controller’s jurisdiction and with the planned taxi path. The other options don’t offer the same clear authorization. Hold means stop and wait, not permission to move. Taxi alone is an instruction to move but doesn’t explicitly grant clearance. Proceed isn’t the standard taxi clearance and could be interpreted as continuing a previous clearance rather than starting a new taxi movement.