What is a disadvantage of using the one-step deicing/anti-icing method?

The one-step deicing/anti-icing method is designed to streamline the process of removing ice and snow from an aircraft's surfaces. However, one major disadvantage is that it tends to use more fluid when there are substantial deposits of ice and snow that need to be effectively flushed off. This is primarily because the method aims to quickly remove ice and snow accumulations while simultaneously applying anti-icing fluid.

In situations where there are significant amounts of ice and snow, the effectiveness of the deicing process can be compromised due to the need for more fluid, which can lead to higher operational costs and reduced efficiency. The nature of the one-step method means that it may not properly address the removal of thick layers of ice, as it might not provide enough time or the right conditions for the fluid to act adequately against large buildups.

This context helps highlight a key operational consideration when choosing deicing methods, particularly in severe winter conditions that require careful assessment of fluid use and effectiveness.