At what altitude does the red Cabin Alt High CAS message illuminate?

The red Cabin Alt High CAS message is designed to alert the crew when the cabin altitude exceeds a certain threshold, indicating a potential issue with cabin pressure. The correct response indicates that this warning activates at an altitude of 12,500 feet. At this altitude, the likelihood of hypoxia becomes a concern for occupants due to reduced atmospheric pressure.

This threshold is critical for pilot awareness and crew safety, as it serves as a reminder to take necessary precautions, such as using supplemental oxygen. Understanding this altitude is vital for safe altitude management during flight operations, especially in pressurized aircraft.