RE: many comments
There’s no doubt the Chinese manufacturers and government steal and reverse engineer quite well but the lucky thing about all of this reverse engineering talk in the comments is that the most metallurgically demanding parts of a jet - turbine blades and vanes, are not simple to reverse engineer. The information necessary to produce them is controlled under regulation and is valuable protected proprietary information from the manufacturer standpoint. It’s not as simple as taking a pile of stolen blades and carving dimensionally identical copies out of a chunk of inconel. They’re directionally solidified single crystal parts, just the processes to achieve that took many decades of R&D and the extremely refined current state of that technology has Chinese manufacturers decades behind in turbines and struggling to catch up. Advanced aero in fans and compressors is one thing, but turbines add a whole extra level of complexity. Modern high performance, high efficiency turbine engines means high pressure ratios and high turbine inlet temperatures. It’s very demanding stuff to operate parts in an environment that would melt them in short order if they weren’t filled with cooling passages and covered in film cooling holes. That’s not even counting current CMC part development, the bleeding edge of turbine tech. I wouldn’t say “don’t worry about it because all is well”, but at the same time I don’t think you’ll be seeing any major airlines outside of china using these planes in any significant number.