Besides the rumor of WS-15 testing on J-11,I dont think that anyone here knows for certain if WS-15 has been test-flighted or not. But people here keep saying that it must have been already tested-flighted. Based on what?
- On being questioned about it, a senior military leader threw a counter question at the reporter "How do you know it has not been tested yet?". I can't seem to remember the name but I'm fairly certain it's about WS-15 on J-20.
- There was an Alert5 piece on a component supplier stating in an annual release of 2019 on very low component supply numbers (4-8) over the coming years.
- Then this piece stating that the engine has passed final design verification.
These are all I know about WS-15.
From these, I drew the conclusion that WS-15 has completed final design verification and would've probably been tested already.
What they are dealing with would be prepping up for Mass production that'd throw its own set of challenges.