I quote my post #5263Why would total production fall from 25 WS-15 engines in 2020 to 10 in 2026? We're among friends so I don't mind stating aloud that the Chinese stock market is a fraudulent pile of crap, so its regulators don't impress me.
From my experience in my company, the pre-production phase is another kind of R&D process where the focus is to fine tune the best practice to guarantee quality consistency in quantity. The time may be short or long. If everything goes well, it is short and need less pre-production pieces, so the decrease over time. Although not guaranteed, it is how planner's do.Along with the maturity of the production specification, the pre-production volume will decrease or even cease earlier than 2026.