When a taxi route requires crossing any runway, pilots must do what?

When a taxi route requires crossing any runway, pilots must hold short until obtaining specific clearance. This requirement is in place to ensure safety on the airfield. Runways are critical pathways for aircraft takeoff and landing, so it is essential for pilots to receive explicit permission from air traffic control before crossing. This process mitigates the risk of runway incursions, which can lead to serious accidents.

Holding short until clearance is a safety protocol that emphasizes communication between pilots and air traffic control, ensuring that the runway is clear and that it is safe for the aircraft to proceed. This procedure helps maintain an organized flow of both taxiing and active flight operations and reinforces the importance of following established operational guidelines in aviation.