Final answer:
The "Mode" selector switch on the autopilot steering stand is used to select any of the following except Speed control. (option b)
Step-by-step explanation:
The autopilot system in aircraft is designed to control various parameters of flight, and the "Mode" selector switch plays a crucial role in this functionality.
Let's break down the options:
Course control: The autopilot can be set to maintain a specific course or direction during flight.
Speed control: The correct answer. While autopilots often can maintain a specific airspeed, the "Mode" selector switch is not primarily used for speed control.
Heading control: The autopilot can be set to maintain a specific heading or direction relative to the aircraft's orientation.
Altitude control: The autopilot can be configured to control and maintain a specific altitude during flight.
The "Mode" selector switch on the autopilot steering stand is not used to select speed control. It is primarily employed for course control, heading control, and altitude control. This distinction is crucial for pilots to ensure the correct functioning and navigation of the aircraft.