The prototype "Superjet" with PD-8 engines reacheda maximum flight altitude of 11,300 meters and a speed of 0.78 Mach during another test flight. The flight lasted 3 hours 13 minutes, the United Aircraft Corporation (UAC) reported.
During the flight, the crew checked the gas-dynamic stability of the engines at altitudes of 3000, 7600, 9000 and 11,300 meters at various speeds - from the minimum permissible to cruising speeds.
The testers also performed fuel consumption measurements at the cruising altitude - horizontal flights at a constant speed to assess the fuel efficiency of the aircraft with the new propulsion system.
The PD-8 engines showed stable operation at all tested altitudes, speeds and operating modes. In total, the aircraft has already spent about 11 hours in the air during flight tests, UAC noted.
Earlierwww1.ru reported that an innovative principle was introduced at the Ilyushin aircraft factory for the production of parts for the MS-21 aircraft.
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