By car From Bern, Zurich or St. Gallen on the A1 autobahn to "Brüttiseller Kreuz" junction. Then take the A 53 autobahn in the direction of Uster and get off at the "Wangen" exit. Follow the signs to the left towards Dübendorf; then drive along the airport until you reach the main entrance. Check in there with the security ("Betriebswache"). RUAG is about 1 km from the autobahn exit.
By public transport At Dübendorf train station ("Bahnhof"), look for the bus sign "Flugfeld Wangen" in the underpass. Go through the underpass and then walk along Wangenstrasse or follow the sign to "Kaserne" (barracks). To the right, you will see the main entrance of Dübendorf Airport ("Flughafen"). Please check in there with security ("Betriebswache"). The RUAG building is on the right after the entrance. About 5 minutes on foot