What must a driver do when parking a vehicle on the airfield?

When parking a vehicle on the airfield, it is essential for the driver to park in a way that does not interfere with aircraft operations. This is critical for maintaining the safety and efficiency of airfield operations, as vehicles must not obstruct taxiways, runways, or designated aircraft movement areas. Proper parking ensures that aircraft can operate safely without encountering any obstacles or hazards.

While securing brakes and leaving keys in the ignition might be considered safe practices in some contexts, they do not address the paramount concern of ensuring that the vehicle does not disrupt aircraft movement. Similarly, turning off lights and locking doors is good practice but does not relate to the operational requirements of the airfield. Finally, contacting the control tower for permission may be necessary for some movements on the airfield, but it does not specifically address the requirements for parking a vehicle. Thus, the most critical action is to ensure that the vehicle is parked in a manner that allows for seamless aircraft operations.