How does a pneumatic rain removal system work?

The correct answer is that a pneumatic rain removal system works by blowing high pressure, high-temperature air across the windshield. This method employs jet-like streams of heated air directed at the windshield to evaporate water quickly, enhancing visibility for the pilot during flight.

The high temperature of the air allows for rapid evaporation, while the high pressure helps to efficiently move the water away from the surface of the windshield. This system is particularly effective in maintaining clarity during adverse weather conditions, such as rain.

Other methods, like heating the windshield surface, can assist in defogging or de-icing but do not actively remove water. Similarly, using a vacuum to remove water or draining water through gutters doesn't align with how pneumatic systems operate; they are primarily designed to push air to clear the surface rather than managing water through other means.