What about the issue of the WS-10A preventing its use on the J10 and FC-1?
I am wondering if there are still tons of technical issues on manufacturing.
If they can't get the yield up, the product might as well as be no good.
kind of like semiconductor, if low yield, the product won't be produced at all.
If certain charts is right, they're wanting to use the WS-10B instead for the J-10. That engine has more power.
There might be issues about manufacturing in the required quantities. The problem is that the J-11s use up two of the engines rather than one, not to mention you need a spare. The J-11 engines have a slightly different configuration than the J-10's, that is, the accessories and gearbox has to be set on top, not on the bottom. Also the producer of the engines is in Shenyang, and Shenyang Liming might have closer associations with Shenyang Aircraft Corporation (favoritism) as opposed to CAC.
Likewise, there may also be a competing
naval and power plant demand on the engines as well.
But I would also think that the next change on the J-10 is a complete package in itself, which means this next version also has a lot of other changes and upgrades not related to the engine. One particular development in one area can hold up the entire version even if that development has nothing to do with the engines. Let's hypothetically say the radar is not ready. It holds up the plane even if the engine is ready. I expect the next version of the J-10 is already being developed or even tested and will have a list of changes.
The engine is too big for the FC-1. It has to use a smaller engine.