What color indicates a TCAS Resolution Advisory (RA)?

A TCAS Resolution Advisory (RA) is indicated by the color red. This is significant because red alerts the pilot to an immediate threat to the aircraft’s safety requiring prompt action to avoid a collision. The urgency associated with an RA is critical, and the red color serves to highlight that pilots must respond quickly to the advisory for safety.

In contrast, other colors such as blue, green, and amber represent different types of alerts or information within the cockpit but do not convey the same level of immediate concern that a red indicator does. Blue typically indicates positive news or normal operations, green signifies safe parameters, and amber is used for cautionary advisories that warrant attention but do not require immediate action. Understanding the meaning of colors in TCAS alerts is essential for safe operations during flight.