Which indicators may suggest a malfunctioning Cabin Atmosphere Control System (CACS)?

A malfunctioning Cabin Atmosphere Control System (CACS) can significantly impact the safety and comfort of passengers and crew. Unusual cabin temperature or noise serves as a direct indicator that something may be wrong within the system. If the temperature fluctuates beyond normal ranges, it can signal that the heating, ventilation, or air conditioning components are not functioning as they should. Similarly, unusual sounds might indicate mechanical issues, such as failing fans or air distribution problems, which can further compromise the cabin environment.

Addressing cabin temperature and noise is crucial, as they directly affect passenger comfort and can lead to safety concerns if the atmosphere does not meet operational standards. These indicators are essential for crew members to monitor to ensure that the cabin remains a safe and pleasant environment.