Revealed as a mockup on 2 September 2012 during the Batajnica 2012 Air Show, the aircraft's first flight was planned for 2013, but was never realized.

[1][2] Based on the proven UTVA Lasta 95P-2 tandem two-seat low-wing trainer, the Kobac promised a 500 kilometres per hour (310 mph) maximum speed and was intended to serve the Serbian Airforce and export customers with advanced training in all weather conditions.

[2] The Kobac concept envisioned modifications to the Lasta platform to suit advanced new roles.

Most importantly it was planned to be powered by a 750 shp (560 kW) turboprop engine housed in a lengthened nose and possess five hard points for the carriage of more than 500 kilograms (1,100 lb) of stores.

Additionally, 190 kilograms (420 lb) fuel tip tanks were planned to complement the 156 kilograms (344 lb) internal fuel capacity, raising the Kobac flight endurance to approximately five hours or 1,500 kilometres (930 mi).