However , the first prototype was lost when it was making its fourth flight on 10 February 1995 .
Originally , the aircraft was to conduct flight tests at Gostomel for three months before transferring to the Gromov Flight Research Institute in Zhukovsky , near Moscow .
The first prototype was lost when it was making its fourth flight on 10 February 1995 .
Originally , the aircraft was to conduct flight tests at Gostomel for three months before transferring to the Gromov Flight Research Institute in Zhukovsky , near Moscow .