According to ARMS-TASS, Deputy Chief of Rostekhnologii Dmitriy Shugayev told the assembled press corps at the Paris Air Show that Russia’s PAK FA will need about eight years to reach serial production.
This sounds like a very different story from what we’ve heard thus far. Most official pronouncements have talked about starting serial production in 2015 or 2016, and pretty much completing the run by 2020.
No reason or context was given for what seems a pessimistic appraisal of PAK FA’s timeline. However, it might be connected to the challenge of getting “second phase” engines on the aircraft.