What is the maximum airspeed for autopilot operation?

The maximum airspeed for autopilot operation is defined by Vmo, which stands for Maximum Operating Limit Speed. This speed is critical because exceeding Vmo can lead to structural damage to the aircraft or difficulties in control due to aerodynamic effects. For the King Air 350, the autopilot is designed to function optimally within the limits of Vmo, ensuring safe and effective handling during flight.

Other options represent different important airspeeds but do not directly relate to autopilot limitations. Vne refers to the never-exceed speed, which is not sustainable and should never be flown. Vs represents the stall speed, which is the minimum flight speed at which the aircraft can maintain level flight and is not suitable for autopilot operation. Vref is the reference landing speed, important for approach and landing phases but not applicable for autopilot operation in cruise. Thus, focusing on Vmo is essential for maintaining safe automated flight.