Which component is NOT pneumatic in the CPCS?

The correct answer identifies the Auxiliary heat control as a component that is not pneumatic in the Centralized Pneumatic Control System (CPCS). The Auxiliary heat control typically involves electric or mechanical systems rather than pneumatic ones. In aircraft systems, the pneumatic system generally includes components that utilize air pressure to operate, while the Auxiliary heat control usually functions independently of the pneumatic pressure.

The other components mentioned are directly linked to pneumatic systems. The solenoid valve controlled by the weight on wheels switch interacts with pneumatic pressure to control various systems based on the aircraft's weight on the wheels. The manual in-flight depressurization option involves using pneumatic controls to manage cabin pressure. Lastly, the DUMP switch is used to quickly depressurize the cabin, also operating within the realm of pneumatic components. This differentiation underlines why the Auxiliary heat control stands out as the exception among the listed components.