The stall speed (IAS) may be increased by which of the following factors?

The stall speed, indicated airspeed (IAS), is the minimum speed at which an aircraft can maintain controlled flight. It can be influenced by various factors, one of which is the position of the center of gravity (CG). When the CG moves forward, the aircraft experiences a higher stall speed because the wing requires a higher angle of attack to achieve the necessary lift. This situation arises due to increased adverse yaw and reduced effectiveness of the control surfaces, necessitating a greater angle of attack to maintain level flight.

High altitude also plays a significant role in stall speed. As altitude increases, air density decreases, which leads to a corresponding decrease in lift for a given indicated airspeed. Therefore, to maintain the same amount of lift and prevent stalling, the aircraft must fly at a higher indicated airspeed.

Icing conditions add weight to the aircraft and disrupt airflow over the wings, resulting in a decrease in lift and an increase in stall speed.

By considering these factors in combination, it becomes clear that moving the CG forward, flying at high altitude, and flying in icing conditions all contribute to an increase in stall speed.