Which altitude triggers the illumination of the red Cabin Alt High CAS message?

The red Cabin Alt High CAS message activates when the aircraft's cabin altitude exceeds 14,000 feet. This warning serves as a critical safety measure to alert flight crews to potential issues with cabin pressurization.

At altitudes above 14,000 feet, the risk of hypoxia increases significantly for passengers and crew due to lower oxygen levels. The system is designed to ensure that the flight crew can take immediate action to manage cabin pressure or initiate descent, mitigating risks associated with high altitudes where cabin pressurization may not be adequately maintained.

The choice that suggests a higher altitude would not trigger the warning at the necessary threshold, as it is specifically designed to alert at 14,000 feet, ensuring timely responses to maintain safety in the aircraft environment.