What typical sensors are part of the CACS?

The correct choice identifies the essential components employed in the Cabin Atmosphere Control System (CACS). The CACS is critical for maintaining a comfortable and safe environment within the aircraft cabin. To achieve this, it relies on temperature sensors, pressure sensors, and humidity sensors to monitor and regulate the atmosphere effectively.

Temperature sensors are imperative as they monitor the thermal conditions inside the cabin, ensuring that it remains within comfortable limits for passenger and crew. Pressure sensors are also crucial since they help manage the cabin pressure, ensuring that it stays within safe operational parameters as the aircraft climbs or descends. Additionally, humidity sensors track moisture levels in the cabin air, which is important for passenger comfort and preventing condensation on surfaces.

In contrast, the other options include sensors that do not directly pertain to the specific functions required by the CACS. Sound and motion sensors are generally unrelated to atmospheric conditions in the cabin. Navigation and lighting sensors focus on the aircraft's operational aspects rather than the management of cabin atmosphere. Finally, fuel and altitude sensors relate to the operational performance of the aircraft rather than the passenger environment.

Therefore, the combination of temperature, pressure, and humidity sensors is integral to the functionality of the CACS, allowing it to maintain the required atmospheric conditions for safety and comfort