Under what conditions are vehicles allowed to be driven around jet engines?

Vehicles are allowed to be driven around jet engines when the engines are turned off and the aircraft is properly chocked. This condition ensures that there is no risk of powerful jet blasts that could potentially cause injury or damage. When the engines are off, the risk of foreign object debris being propelled by engine thrust is eliminated, making the area around the aircraft safer for vehicle operations.

Chocking the aircraft provides an additional safety measure, preventing any unintended movement of the aircraft. This helps ensure that even in the unlikely event of a malfunction or mishap, the aircraft remains secure and does not pose a danger to surrounding vehicles or personnel.

In contrast, other conditions—such as when aircraft are being unloaded, the presence of safety cones, or the presence of ground crew—do not adequately address the fundamental safety concerns associated with operating vehicles near jet engines. Whichever protocol is followed, ensuring a safe operational environment around aircraft is paramount.