1.   The boots are thick rubber balloons on the forward edges of the wings that alternately inflate and deflate to break off accumulated ice.

2.   The boots are on the forward edges of the wings, thick rubber balloons that alternately inflate and deflate to break off accumulated ice.

3.   When switched on inside the car, the system sends warm water and antifreeze from the radiator through the wells to melt accumulated ice and snow.

4.   When necessary, the flight crew can cause it to pump full of air, thus breaking up accumulated ice.