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Abstract
Surveillance support equipment plays a crucial role in aviation safety, where data must be consistently distributed without interruption. One of the most essential surveillance support tools in aviation today is radar. Radar is a device used to detect and measure distances, crucial for air traffic controllers in managing aircraft movements. AirNav's Padang branch itself utilizes an Indra radar surveillance support tool, where the radar data from Padang is transmitted and utilized by AirNav's Pekanbaru branch for observing the APP sector. This research will analyze the causes of aircraft target loss in the AirNav Pekanbaru ATC System. After examination and analysis, it was found that there was a disruption in the data transmission flow from Padang to Pekanbaru due to a malfunction in the connecting device (switch).