1. 8993. What are three methods of anti-icing aircraft windshields? 1. Blanket-type heating system. 2. An electric heating element in the windshield. 3. Heated air circulating system. 4. Hot water system. 5. Windshield wipers and anti-icing fluid. 6. Ribbon-type heating system. A. 2, 3, 5. B. 1, 2, 6. C. 2, 3, 4