The prototype MS-21-300 the First time he performed the landing in the dark, said the press service of the Ministry of industry and trade. MS-21-300 tests on the airfield Flight research Institute. M. M. Gromov. During the flight, the Experts checked the work of the navigation systems and landing, as well as external lighting. For system testing, the aircraft made several passes over the runway from 2 directions at different altitudes." Flight mission is completed, all systems were operating normally ",