What action is required to identify a Mode 3/A target?

To identify a Mode 3/A target, the appropriate action is to request identification from the aircraft. This involves asking the pilot to respond to a transponder code or "ident" request, which enables the radar system to differentiate that particular target from others. When the pilot activates the identification feature on their transponder, it will trigger the aircraft's return on the controller's radar display to become more prominent, often by providing a more distinct return or changing its radar symbol. This method is a standard procedure in air traffic control to ensure that the controller can confirm the identity of the target and enhance situational awareness.

Requesting a position report, changing a computer-assigned code, or seeking visual confirmation are not standard methods for identifying a Mode 3/A target specifically. Position reports rely on pilot communication and may not directly confirm the target's identity without the enhanced returns that come from the ident request. Changing the transponder code does not guarantee immediate identification, as the aircraft may still not respond accurately without the ident feature being activated. Visual confirmation can be helpful in some situations, but it is not a reliable means of identification, especially in busy airspace or limited visibility conditions.