Brainsucker
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Yes indeed an interesting calculation:
Given this order from 2011 and in mind of the first 53 batch 1 J-10B produced (55 - the last two with WS-10B) and now already 49 batch 2 J-10C - therefore 123-102 = 21 - then, there are only 21 engines left.
Extrapolating or reserving 6 for the last 6 remaining J-10Cs batch 2 to be produced - if batch 1 & 2 are the same size - then this would be only 15 engines as a "replacement" or other use.
That's even more interesting - and "confirming" my theory - since if one assumes that the J-20A also uses the AL-31FN series 3, then their powerplants must come from another, still secret contract similar to the original first contract for the J-10.
Deino, but what about the spare engine? They can't use all engines to build new fighters aren't they? What happen when the engine need overhaul?