Michal,
Check out the online archives of the Austrian newspaper
Arbeiter-Zeitung. On 31 July 1956 it says that the Jak-18s landed at Kirchberg am Wechsel and at Oberbergern, south of Krems.
One name is mentioned: Lesnek Szachogluchowicz.
See:
http://www.arbeiter-zeitung.at/cgi-b...page=02&html=1
Regards,
Leendert