When deicing the wings, in what direction should the sweeping motion occur?

The correct approach for deicing the wings is to use a sweeping motion that moves aft and inboard. This method is effective because it allows the deicing fluid to flow towards the main portion of the wing structure, ensuring that it efficiently removes ice from the leading edges and prevents further accumulation.

When the motion is directed aft, it takes advantage of the aerodynamic airflow over the wing, which can assist in the effective application of the deicing agent and its subsequent performance. Sweeping inboard ensures that the deicing fluid is applied to areas that are critical for maintaining laminar flow and reducing drag in flight.

Other directions, such as forward and outboard, do not harness the benefits of airflow as effectively, potentially leading to inadequate deicing coverage. The vertical upward or horizontal side-to-side movements may also not apply the deicing agent in a manner that optimally protects the wing from ice accumulation. Thus, the chosen direction is specifically designed to maximize the efficiency and effectiveness of the deicing process.