Icing decreases aircraft lift and thrust while increasing drag and weight. It can block pitot tubes, damage skin from ice chunks, obscure windscreens, jam control surfaces, and interfere with radios and landing gear. Icing intensity ranges from trace to severe. Supercooled water droplets are the cause. Types of icing include clear, rime, mix, and rain ice. Pilots should be educated on anti-icing equipment, check forecasts, clear ice from airframes, expect icing at certain flight levels, and avoid known icing areas.