What must not adhere to any part of the RPAS for safe operation?

For safe operation of a Remotely Piloted Aircraft System (RPAS), it is crucial that frost, ice, or snow does not adhere to any part of the aircraft. These substances can significantly affect the aircraft's performance and safety. Ice and snow can add extra weight, disrupt airflow over the wings and control surfaces, and impact the drone's ability to maneuver effectively. Furthermore, icing can lead to a loss of lift or control, crucial for maintaining stable flight, especially during critical phases such as takeoff and landing. Therefore, ensuring that frost, ice, or snow is completely removed before flight is essential for ensuring the RPAS operates safely and effectively.

While dust, dirt, water droplets, and fabric coverings can also potentially affect flight performance, they do not pose as significant a threat to flight safety as ice or snow, which can critically impair critical aerodynamic functions.