By the time the FC-31 is available for purchase it is highly likely the Russians will have finished development of the Su-57M and the AL-51 engine will be in serially produced fighters. As is they already are likely producing like 8 airplanes a year, and this will likely increase to 12 next year. This might seem low to some people, but it is about the same production rate as the French had for the Rafale. And production can be further ramped up if the factory ceases producing the Su-35. Production of those 12 aircraft a year is with them basically using like half the floorspace in the factory to produce the Su-57. Also from what I know that was also with them operating a normal production schedule with one shift. They could easily triple the amount of work hours in the same floor space if they wanted to by going from a single shift 8 hours a day, 5 days a week, to two shifts 12 hours a day, 6 days a week.
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