Firstly, quoting this particular sentence from a post in the Indian Military News and Reports Data Thread:
This made me curous about the procurement numbers of engines for Chinese fighter jets.
If I remembered correctly, someone in this forum mentioned that 3x WS-10 engines would be arranged for every single Flanker (J-11, J-15, J-16) that China produces. That is, 2x WS-10 to be fitted on one Flanker airframe, while the extra 1x WS-10 would be allocated as a spare for said Flanker airframe.
I believe this holds true for the other twin-engine fighter jets serving in the PLA as well, i.e. J-20 (and J-31/35 in the future).
With the case for twin-engine fighters settled, does anyone know how does the PLA allocate WS-10 engines for single-engine fighter jets, i.e. J-10?