What immediate action should be taken if you observe an aircraft crossing a runway boundary without clearance?

Study for the Initial Tower Cab Training Block 3 Test. Tackle multiple choice questions with detailed explanations. Master air traffic control basics and excel in your assessment!

Multiple Choice

What immediate action should be taken if you observe an aircraft crossing a runway boundary without clearance?

Explanation:
Runway incursions demand immediate intervention to prevent collisions. When you observe an aircraft crossing the runway boundary without clearance, the priority is to stop its movement right away and clear the traffic path, so no aircraft is allowed into or across an active runway. At the same time, inform ground to coordinate proper clearance and sequencing, ensuring other traffic is kept clear and safe. This rapid, decisive action is necessary because delays or partial measures can lead to a dangerous situation. A warning alone doesn’t stop the aircraft; telling the pilot to continue if they claim to see something is unsafe; waiting to contact the tower after the fact is too late for protective action.

Runway incursions demand immediate intervention to prevent collisions. When you observe an aircraft crossing the runway boundary without clearance, the priority is to stop its movement right away and clear the traffic path, so no aircraft is allowed into or across an active runway. At the same time, inform ground to coordinate proper clearance and sequencing, ensuring other traffic is kept clear and safe. This rapid, decisive action is necessary because delays or partial measures can lead to a dangerous situation. A warning alone doesn’t stop the aircraft; telling the pilot to continue if they claim to see something is unsafe; waiting to contact the tower after the fact is too late for protective action.

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