ATPL: The two main design functions of Secondary Surveillance Radar (SSR) Mode S are:
Domanda 198, Radio Navigation - ATPL - Airline Transport Pilot license
| Collision avoidance using TCAS II and improved long range (HF) communication capability. |
| Air to ground and ground to air data link communications and improved ATC aircraft surveillance capability |
| The elimination of ground to air communications and the introduction of automatic separation between aircraft using TCAS II |
| Aeroplane is circling around the station |
