Sukhoi is developing the single-seat, twin-engine T-50 to meet the Russian air force's PAK FA requirement for a new fighter aircraft. The initial T-50 prototype made its first flight in January 2010. A second prototype joined the flight-test program in March 2011. A third prototype took to the air in November 2011, followed by a fourth in December 2012. These aircraft are fitted with the Saturn 117 turbofan engine, which is to be used on initial production T-50s. Later production T-50s are ...

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