What method is used to actuate the CPCS system in the Tradewind?

The correct answer is pneumatic actuation, which means that the CPCS (Cabin Pressure Control System) in the Tradewind is operated using compressed air. This method utilizes the principles of pneumatics, where air pressure is used to control the system’s valves and functions, allowing for the management of cabin pressure effectively and reliably.

Pneumatic systems are advantageous for their lightweight design and ability to provide consistent force without the need for large mechanical components. In aviation, using air pressure for various systems, including cabin pressure control, ensures smooth operation and responsiveness to changes in altitude and environmental conditions.

Understanding that pneumatic systems rely on air rather than liquids or electronics clarifies why this choice is the most appropriate one for the function of the CPCS in the Tradewind aircraft.