Which fluids are commonly used for de-icing?

Type I de-icing fluids, which are glycol-based, are widely used for de-icing aircraft because they effectively melt ice and snow upon contact. These fluids are designed to be heated before application, allowing them to quickly lower the freezing point of the contaminants on aircraft surfaces.

The properties of Type I fluids make them particularly effective for de-icing, as they can remove existing ice and snow and ensure a clean surface before takeoff. The glycol compounds in these fluids not only provide the necessary heat transfer to dissolve ice but also help prevent immediate re-freezing.

In contrast, the other types of fluids mentioned, while relevant to the broader context of de-icing and anti-icing, serve different purposes. Type A fluids, being water-based, may not be as effective in extreme cold conditions. Type III fluids are designed primarily for anti-icing on slower aircraft, providing lasting protection but not necessarily effective for removing ice. Type IV fluids are also used for anti-icing but are specialized for high-speed aircraft, lacking the rapid de-icing capabilities needed before takeoff.

Thus, the emphasis on Type I de-icing fluids reflects their unique formulation aimed at effectively dealing with ice and ensuring safe flight operations.