This is the original prototype for the L-159 ALCA with its maiden flight taking place in August 1997. The second prototype (5832, '356') was a single seater and this is the version that the Czech AF preferred and ordered into production. After supporting the single seater through the testing and development phase, the two-seat prototype was officially retired in June 2003 and is now on display at the Staré Aerovka museum at Letňany.