What does the Mode C Intruder (MCI) Alert indicate to radar controllers?

The Mode C Intruder (MCI) Alert is significant in the context of radar operations as it specifically indicates the presence of untracked targets that may pose a potential threat to controlled airspace or to known aircraft in the vicinity. This alert is crucial because it helps radar controllers maintain situational awareness and ensures the safety of actively monitored flights by prompting them to investigate further.

In typical operational scenarios, untracked targets can include a variety of scenarios such as aircraft without transponders or newly entered aircraft that have not yet been adequately identified. When an MCI Alert is issued, it serves as a warning, prompting controllers to take appropriate measures to clarify the situation, either by obtaining information from the untracked target or by advising other nearby aircraft to remain vigilant.

Understanding the nature of the MCI Alert is essential for controllers to manage air traffic effectively and mitigate risks associated with airspace conflicts. Therefore, recognizing the importance of this alert and its implications helps enhance overall safety in aviation operations.