The Si 204D-1 was a blind flying trainer licence-built from Siebel in Halle by Aero in WWII in this very hangar (because Siebel were at full capacity producing ju-88s). The Aero C-3 was a Czechoslovak post-war development of the Si 204 for flying (C-3A) and crew training (C-3B). No complete C-3A has survived so this is a replica (of LB-05, cn 307) constructed from a French SNCAC NC.702 Martinet and is on display at the Staré Aerovka museum.