What does a red CAS message indicate?

A red CAS (Crew Alerting System) message indicates an emergency situation that requires immediate action by the flight crew. This type of alert is intended to draw the crew's attention to a critical fault or condition that could compromise the safety of the flight or require urgent intervention to avert a serious issue.

When confronted with a red CAS message, pilots are trained to respond quickly in accordance with established emergency procedures. This could involve actions such as executing specific checklists or altering flight operations to maintain safety.

In contrast, other colors or classifications of messages in the CAS system may indicate less urgent conditions or notifications that do not necessitate prompt intervention. These distinctions help to prioritize crew responses effectively during critical flight operations.