In what circumstance may automatic track initiation occur for an aircraft?

Automatic track initiation is a radar function that allows radar systems to start tracking an aircraft automatically based on specific criteria. One of the key requirements for this process is the presence of a discrete beacon code assigned to the aircraft. When an aircraft is squawking a discrete beacon code, it means that the aircraft's transponder is actively transmitting its unique code, which helps the radar system to identify and track the aircraft accurately. This capability is essential for maintaining situational awareness and ensuring safe separation between aircraft in busy airspace.

Having a unique visual identifier, being at a low altitude, or even entering controlled airspace alone does not guarantee automatic track initiation, as these factors do not provide the radar system with the necessary identification and tracking information that a discrete beacon code does. Therefore, the presence of a discrete beacon code is the critical condition that enables the radar system to automate the tracking process effectively.