What should be ensured for effective operation of CACS during flight?

For the effective operation of the Cabin Atmosphere Control System (CACS) during flight, it is essential to conduct regular performance checks and maintenance. This ensures that all components of the system are functioning optimally and any potential issues are identified and rectified before they can affect the cabin environment. Regular checks help maintain air quality, temperature control, and pressure balance within the cabin, which are critical for passenger comfort and safety.

By performing routine maintenance, any wear and tear on equipment can be managed proactively, thereby preventing system failures during flight. This is particularly vital as the operational demands on the CACS can vary significantly depending on altitude, temperature changes, and passenger load.

Other options, such as the use of expensive materials, minimizing system redundancy, or focusing on aesthetic design, do not contribute directly to the operational effectiveness or reliability of the CACS. Instead, they may compromise performance in favor of non-essential factors.