What happens to the CAS message when the left engine switch is activated while the passenger door is open?

When the left engine switch is activated while the passenger door is open, the CAS (Crew Alerting System) message changes to amber. This color change indicates a cautionary condition that requires the crew's attention. Amber alerts signify that there is an ongoing alert that the crew must assess but may not require immediate action. In this scenario, it warns the crew that a potentially unsafe condition exists, such as the passenger door being open while a critical switch is being activated.

This color-coding in aviation systems is vital as it helps pilots quickly assess the severity of issues and prioritize their response during flight operations. The other options do not accurately reflect the CAS message's behavior under these circumstances; for instance, the message does not disappear immediately or stay white, nor does it beep continuously. Instead, the amber color serves as a clear visual indicator that the situation should be investigated further by the crew.