What does a Mode C Intruder alert radar controllers to?

A Mode C Intruder alert is used by radar controllers to notify them of situations requiring immediate action concerning the interaction between tracked and untracked targets. When an aircraft enters a controlled airspace or approaches a radar contact without being identified or tracked, the radar system can generate an alert indicating a potential conflict or an airspace infringement. This alert prompts controllers to take appropriate action, such as advising nearby pilots or initiating traffic separation procedures.

This function is critical for maintaining safety in the skies, as it helps ensure that both controllers and pilots are aware of potentially hazardous situations involving aircraft that may not be under radar control or communication. Understanding the operation of Mode C Intruder alerts is essential for effective air traffic management and collision avoidance.