Probably after the frame is exhausted, the working engine still can be extract from the frame and used as spare.
As for the new J-15, its bit harder to extract more info after our reliable wall climber was invited for tea session with authorities.
Now that just stinks, give the guy a better camera and a press pass, come on, try a little western style marketing, even though this is more fun, much like a stolen watermelon, they just seem to taste better.
---------- Post added at 09:34 PM ---------- Previous post was at 09:27 PM ----------
There was another one, if I did not recall wrongly but some claimed that one has the radomne PS into J-11A series of non black.
By the way, this pic seems to show a testing again. One AL-31F and another clearly is WS-10A. But serial number PS off.
But I hope this is an indication real mass production of WS-10A is coming. Indeed, with this testing and recent continue order of AL-31F.
It does not indicate well WS-10A is producing enough numbers to fulfil PLAAF requirement. I hope this situation will end soon.
They almost always hang the new engine alongside the old standard, its the best and safest method of collecting data and observing performance on an operational aircraft, that way if you lose the new engine, or have to shut it down, you can bring it home and look at it and hopefully fix it.?