In the context of TCAS operations, what is considered a 'case break'?

In the context of TCAS (Traffic Alert and Collision Avoidance System) operations, a 'case break' refers to a situation where the system provides a positive course guidance indication. This is a critical aspect of TCAS because it indicates to the pilot that a specific maneuver is required to avoid potential collision with nearby aircraft. The positive course guidance ensures clarity in the actions needed, helping the pilot understand the most effective way to respond to the traffic situation.

While other options might relate to different aspects of flight operations or systems, they do not specifically capture the essence of what a 'case break' signifies within TCAS functionality. Understanding this term is vital for safe flight operations, as it directly impacts how pilots interpret and respond to TCAS alerts.