During the deicing process, how should the aircraft's surface be prepared?

Preparing the aircraft's surface by ensuring it is dry and clean is critical for effective deicing. When the surface is free of contaminants like snow, ice, or dirt, the deicing fluid can adhere properly and work to melt any existing ice or snow on the aircraft. A dry and clean surface allows for optimal performance of the deicing agents, ensuring that they can effectively prevent ice accumulation and maintain safe aerodynamic properties during flight.

If the surface is not clean or is wet with antifreeze, it can hinder the deicing process by preventing the fluid from forming a proper bond with the surface, thus making it less effective in providing the necessary protection. A layer of snow can trap moisture and further complicate the deicing process. Therefore, maintaining a clean and dry surface is essential for ensuring the safety and reliability of the aircraft prior to takeoff.