In a two-step deicing/anti-icing process, which fluid is applied to perform the deicing step?

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Multiple Choice

In a two-step deicing/anti-icing process, which fluid is applied to perform the deicing step?

Explanation:
In the deicing step you want a fluid that can spread quickly, penetrate ice, and wash it away. Heated Type I fluid has low viscosity when warm, so it flows over the wing surface, breaks the ice bonds, and helps lift and remove the contamination. After deicing, a thicker fluid (Type II or IV) is used for anti-icing to stay on the surface and prevent re-icing. Water or cold, thickened fluids aren’t effective for removing existing ice, and cold Type II wouldn’t deice properly.

In the deicing step you want a fluid that can spread quickly, penetrate ice, and wash it away. Heated Type I fluid has low viscosity when warm, so it flows over the wing surface, breaks the ice bonds, and helps lift and remove the contamination. After deicing, a thicker fluid (Type II or IV) is used for anti-icing to stay on the surface and prevent re-icing. Water or cold, thickened fluids aren’t effective for removing existing ice, and cold Type II wouldn’t deice properly.

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