What is the primary function of anti-icing fluids after de-icing?

• A. To instantly remove ice
• B. To prevent ice formation on aircraft surfaces for a period
• C. To heat ice to melt instantly
• D. To increase wing loading

Answer: (B)

The main function is to prevent ice formation on aircraft surfaces for a period after application. Anti-icing fluids leave a protective layer that slows or stops new icing from forming on wetted surfaces during taxi, hold, and the approach to takeoff. The duration of protection, called holdover time, depends on the fluid type and concentration, as well as temperature and precipitation conditions. They are not meant to remove existing ice or to heat ice or increase wing loading. Use them within the holdover time and reapply if conditions require.