allows service consumers to provide the correct & latest up-to-date controller information regarding sector-specific information and coordination & transfer information, such as taking control of a flight (or proposing hand-over, request-on-frequency, etc.), Change the coordinated entry and exit levels, Deliver departure clearance for an flight departing from an internal aerodrome, Skip and cancel-skip of an internal sector, Bypass and cancel-bypass of the 1st downstream internal sector, Delegate the flight to another internal sector, Change the next downstream internal sector into the preferred one, Change the entry/exit frequency of sectors, Etc.
Upon communication of the SSR code to the aircrew, the aircraft transponder will emit that code. Furthermore, the present/next SSR codes allocated to the flight plan are communicated to downstream partners interested in the flight.