What color signifies a master warning in the Crew Alert System?

In the context of the Crew Alert System used in aviation, a master warning is signified by the color red. This choice is indicative of the severity of the situation being alerted. The use of red is consistent across many aircraft systems as it typically communicates a critical issue that requires immediate attention from the flight crew.

The color red alerts the crew to serious malfunctions or emergencies, prompting them to take swift action to ensure safety and mitigate any potential risks. The clear distinction provided by the color red is essential in an environment where multiple alerts can occur, making it vital for pilots to quickly identify and respond to the most urgent alerts.

In contrast, other colors such as yellow typically denote cautionary warnings or less critical alerts, while cyan and white are used for information or status updates that do not require immediate action. Hence, the choice of red for a master warning effectively underscores its importance in ensuring the safety of the flight and the crew.