Originally Posted by
Del Prado
Lots of info in Mats part 1 about how to identify via Primary, mode A and mode S.
Mats part 1, chapter 6, section 4 onwards
Mode S ident would rely on the controller correlating the Mode S address from the radar with the Mode S address from the flight plan and that’s not present on the flight progress strip.
It is not necessary to correlate the Mode S address only the aircraft identification feature (callsign input into FMS) with the FPL callsign on the FPS. From my experience it is only NATS units that use the ident feature to identify a/c on departure.
Is it the case that the callsign displayed on NATS systems is derived from mode A by callsign conversion rather than displaying the mode S flight ID? Maybe this is why the ident is needed?