What does the RA display indicate to the pilot?

The RA display, or Resolution Advisory display, is an important feature of an aircraft's flight management and collision avoidance system, specifically the Traffic Collision Avoidance System (TCAS). This display provides the pilot with real-time information regarding potential conflicts with other aircraft, indicating whether to climb or descend, along with the recommended vertical rate of change needed to avoid an impending collision.

In situations where the system detects that another aircraft is on a potential collision course, it will issue a resolution advisory that includes specific altitude instructions. This guidance is critical for maintaining safe separation between aircraft and is designed to prevent mid-air collisions. Therefore, the indication provided by the RA display helps pilots make informed decisions to maintain safety during flight.