According to an article in the American media The New York Times, the United States will suspend the sale of engines to COMAC. The C919 currently uses the LEAP-1C engine produced by CFM International, a joint venture between General Electric of the U.S. and Safran of France. It is reported that the U.S. Department of Commerce has suspended licenses allowing some U.S. companies to sell products and technologies to COMAC for the development of its C919 aircraft. If this news had been released ten years ago, it would have caused significant obstacles to our large aircraft project. However, at present, it can only be said that the U.S. is overreacting. Take Y-20B as an example. The WS-20 has already entered mass production. Although it is a military version, the foundation has been laid, or at least there is a backup version. Not to mention the CJ-1000A and CJ-2000 high-bypass turbofan engines under development, which are specifically designed for passenger aircraft. With the experience of developing the WS-20, the progress of the commercial version of the CJ-1000A will not be too urgent. As they say, when you're sleepy, even a pillow helps. If it weren't for the need to obtain European and American airworthiness certificates, they couldn't really strangle us too much. But if this happened ten years ago, it would have been quite passive. However, this is still a military version. The core engine is actually the key. After all, the performance requirements for military and civilian engines are completely different, which leads to a huge difference in the core cycle parameters of the two. Taking the WS-20 and CJ-1000A as examples, the former focuses on reliability under extreme conditions (especially field airstrips), thrust (the ability to work at full thrust for long periods while ensuring stable and reliable operation under such extreme conditions without surging or other problems), and maintainability. The latter emphasizes fuel economy, low noise, and flight stability. Moreover, the technical complexity also varies significantly; otherwise, the WS-20 could simply be used directly. That's not the case. As early as March 2023, a Y-20 test aircraft with commercial livery was quietly unveiled. The most striking feature was the appearance of a sturdy "big barrel" under the wings. Upon closer inspection, you'll notice that the shell color is very similar to the early exposed CJ-1000A livery. Also, the white livery of the Y-20 itself indicates the purpose - it has nothing to do with the military version and is purely an airborne test platform for the commercial version. The object of testing naturally is the CJ-1000A high-bypass turbofan engine. It has been more than two years since then. As long as no major issues arise, the CJ-1000A has a high probability of nearing mass production. Although engine development is not achieved overnight, the appearance of an airborne validation platform is almost identical to the early WS-20 advancement model. Of course, the key lies in when it will appear on the C919. This is just a matter of time. At this moment, the U.S. has suddenly taken action, which is very likely due to some information it has picked up and wants to nip it in the bud. However, this approach is ineffective. It can only prevent obtaining European and American airworthiness certificates. China is vast and rich in resources. We can use them domestically first. In fact, this piece of information worries some European and American suppliers more. If the core part like the engine isn't a problem, other supporting measures like avionics and flight control systems also choose European and American manufacturers. In short, to obtain airworthiness certification, your actions will naturally lead to a large amount of domestic substitution. You might be able to hold back chips and lithography machines for a while, but now we're not worried about that! These are high-reliability products rather than high-end ones. As long as durability and reliability pass, they are fine. Original source: https://www.toutiao.com/article/7510054197530853914/ Disclaimer: This article represents the author's personal views. Please express your attitude by clicking the "Like/Dislike" buttons below.