The Sukhoi T-50 PAK-FA fifth-generation stealth fighter will start operational testing in 2014

"In 2013 we are expected to wrap up its preliminary tests and start operational testing. In 2014, we are planning to start official state tests," says United Aircraft Corporation president Mikhail Pogosyan. The first stage of those state trials should be completed by 2015.

The PAK-FA developmental flight test phase includes six airframes, but one is a ground test vehicle. "Flight testing this year will go ahead with five aircraft," Pogosyan says.