What airspeed range is required to prevent further accumulation of ice on the airframe?

To prevent the further accumulation of ice on the airframe, it is important to maintain an airspeed that is high enough to create a significant relative motion over the surface of the aircraft. At higher airspeeds, the airflow over the wings and other surfaces tends to be more energetic, which helps to keep ice from adhering to the surface by generating more lift and disrupting the conditions conducive to ice formation.

The range specified, 500-600 KTS, is optimal because it corresponds to increased dynamic pressure and airflow, which can mitigate the icing process. This speed range is often used in aviation, particularly for jet aircraft flying in colder conditions where ice accumulation is a concern. Maintaining this airspeed reduces ice formation effectively, as the aircraft's surfaces remain warmer in relation to the freezing temperatures of the surrounding air and conditions, thereby minimizing the potential for ice adhesion.

Conversely, the other airspeed ranges provided (300-400 KTS, 400-500 KTS, and 600-700 KTS) either fall short of the required threshold for effective ice prevention or exceed general operational limits where other risks may outweigh the benefits. It is crucial for pilots to operate within the right airspeed range to ensure both safety and aircraft performance during potentially icing