^ and that is the difference between having a look and actually maintaining and repairing something again and again. As far the technology is concerned, on the theoretical domain, I have no doubt about the abilities of PAF aero-engineers but real issue is the practical R&D and a standardized manufacturing lines. Chinese have been great help to us as far as the R&D is concerned but their own engine assembly lines are facing with some quality control issue due to not being able to produced necessary skilled workforce and standardized assembly lines. Nevertheless, Still i think PAF is eyeing on the commonality of sub-systems including Engines.