Why is it crucial not to mix different types of de-icing fluids?

Mixing different types of de-icing fluids is crucial to avoid because it leads to altered performance characteristics. Each de-icing fluid is formulated with specific chemical properties that determine its effectiveness, viscosity, freezing point depression, and other important factors for safe de-icing. When different fluids are combined, their individual properties can interact in unpredictable ways, potentially resulting in a product that does not perform as intended. This could lead to inadequate de-icing or anti-icing, adversely affecting aircraft safety during operations.

The importance of maintaining the integrity of a single type of de-icing fluid is paramount; it ensures uniform performance and predictability of outcomes. When only one type is used, operators can rely on established testing and performance data for that fluid, allowing for better safety management in aviation operations.