Which situation can cause the canopy of a PPC to collapse?

The situation that can cause the canopy of a PPC (Powered Parachute) to collapse is flying into a thermal downdraft. A thermal downdraft is a rapid downward movement of air that occurs in the presence of thermal activity, often found in unstable weather conditions. These downdrafts can disrupt the airflow over the canopy, leading to an uneven distribution of pressure. When this happens, the canopy may lose its lift and collapse, which can result in a sudden drop in altitude and a potential loss of control.

In contrast, flying in stable weather conditions typically promotes smooth airflow over the canopy, reducing the likelihood of collapse. Maintaining a steady speed tends to keep the airflow consistent and helps to maintain the shape of the canopy. Performing a controlled descent is generally executed in a manner that maintains the canopy's integrity and lift. Therefore, the unstable airflow caused by entering a thermal downdraft is particularly dangerous and can lead to serious issues with the PPC's canopy.