How a runway sweeper catches metal
A runway sweeper can carry a magnet bar close to the pavement. As the vehicle moves, the magnetic field pulls in ferrous scraps—materials containing iron, such as many steel screws and nails—and holds them against the bar or in a collection assembly. The low position matters: the field weakens quickly with distance, so the magnet must pass near debris on the surface.
This is a targeted cleanup tool, not a way to collect every kind of litter. Aluminum pieces, plastic, and other nonmagnetic debris will not stick to an ordinary magnet, so crews use visual inspections and other cleaning methods as well.
Why tiny objects matter to aircraft
A hard metal fragment can be driven into an aircraft tire as the wheel rolls over it, potentially damaging the tire. On the runway or near an aircraft, loose material can also be drawn into an engine’s airflow. Keeping the pavement clear reduces those hazards before an aircraft arrives; once a plane is moving, there may be little time to react to an object in its path.
The sweeper is one part of a broader routine of checking and clearing airport surfaces. Its value is practical: a slow pass with a magnet can remove small, easily overlooked pieces of iron or steel that are difficult to spot from a distance. But the magnet only catches what its field can reach—and only what is magnetic—so runway safety still depends on finding debris the magnet cannot collect.
