ATC Department

Radar (CTR)



The role of the Radar controller is to separate traffic when en-route as well as instruct climb and descend to and from final flight level. The duty is to keep organized airways over the Swiss airspace and let traffic reach FIX and FL to respective hand/off points with other controllers (Swiss and non-Swiss).

The role of Radar is quite simple given the traffic flow uses standard airways, at correct flight levels (odd versus even) and follows aviation rules. In IVAO the role of CTR is complicated as this position usually takes care of all the duties of the airports in its FIR from DEL up to CTR.


Basic Knowledge Requirements

A CTR controller must be perfectly familiar with:


Controller in Action

The first step for the virtual controller that wants to act as CTR would be to be sure he/she is in line with the knowledge requirements highlighted above.

As this is done, the controller should load the sector file for Swiss Radar. The sector file can be found on our welcome-site under the quicklinks.

The second step is to check the latest Handy Sheet, where all the necessary information are summarised in a single document for all the airports under control.

In the IVAC's COMM Box the controller has to set his primary frequency in line with CTR frequency. In order to do so just type //199.999  where 199.999 stands for the frequency one wants to set up.

The next step is the setup of the altitude filter. As the CTR controller is responsible for a large multitude of different traffic, the advice is to not set altitude filter. In somer cases some Radar controllers prefer to set a filter that start 100ft above ground. In order to do so under the menu "PVD" (top left) select "PVD Options..." the controller will set Primary filter from 100 ft above ground to UNL. This is 1'500 ft to 60'000 ft.

Once IVAC is ready, it is time to connect.

As soon as the controller is online the first priority is to create the TS channel followed by the filing of a correct ATIS.

The station name and frequency have to be in line with guidelines from ATC Department and can be found here: LSAZ and LSAG. The remarks box must be left empty unless a special situation requires to be communicated to pilots.

Always inform nearby controllers of your presence online.

The Radar will identify traffic crossing the airspace in the two directions, North-South and East-West (and vice-versa). His duty is to keep the crossing traffic separated each other, vertically and horizontally. The controller will instruct the traffic to proceed to specific FIX, VOR or NDB as well as restrict speed. It is mandatory a detail knowledge of all the LoAs active with other countries. Short-cuts that ends outside Swiss Radar's airspace must be coordinated with affected controller.

Swiss Radar will also assume traffic that is climbing from one of the Swiss airports, as well from one of the airports close to the Swiss border. CTR will instruct them to climb to the final requested flight level in accordance with restrictions due to other traffic as well as semi-circular rules.

In addition, CTR will instruct traffic to descend in order to reach their destinations at a suitable altitude for a prompt and safe landing. Swiss Radar doesn't instruct only Swiss arrivals, but takes care of prepare the descend for traffic that has as destination an airport outside Switzerland. Also in this case, LoAs are fundamental.

Swiss Radar uses as a primary language English ONLY


Phraseology Examples



 Pilot  ATC

Swiss Radar, good day, Easy 22D at FL370 overhead NATOR 


Easy 22D, Swiss Radar, identified, direct ODINA


Direct ODINA, Easy 22D [thank you]




Descend Clearance

Pilot ATC

Speedbird 728, expect FL190 crossing AKASU, report ready [for descent]

Expecting FL190 over AKASU, wilco, Speedbird 728


Traffic reaches Top Of Descend

Ready for descend, Speedbird 728


Speedbird 728, descend to FL190 [to be levelled at AKASU]



Climb with restriction

Pilot ATC

Swiss 215, climb to FL290, restricting traffic at FL300 [expect further climb in 10 minutes]

Climb to FL290, Swiss 215


Traffic separation is solved 


Swiss 215 climb FL370

FL370, Swiss 125