From Canadian Power Wiki
The Su-50 PAK FA is intended to be the successor to the MiG-29 and Su-27 in the Russian inventory and serve as the basis of the Sukhoi/HAL FGFA being developed with India. The T-50 prototype performed its first flight January 29th 2010.
The Russian Defence Ministry will purchase the first 10 evaluation example aircraft after 2012 and then 60 production standard aircraft after 2016. The first batch of fighters will be delivered with current technology engines. The PAK-FA is expected to have a service life of about 30–35 years.
Production model aircraft will be powered by a pair of Izdeliye 30 afterburning turbofan engines which generate 24,055 lbf (107 kN) dry and 39,566 lbf (176 kN) on the afterburners.