不许中国发展大飞机？美国关税战败北，再出坏招，禁止发动机出口

Group 1 - The U.S. has publicly criticized China for allegedly violating agreements and has taken action against China's large aircraft projects by banning the export of commercial aircraft engines to China [3][4] - The U.S. government's actions indicate a continued adversarial stance towards China, despite previous setbacks in the trade war, with specific measures aimed at hindering China's development of large aircraft [4][6] - The ban on the LEAP-1C engine, which is crucial for China's C919 aircraft, poses a significant threat to the production of this aircraft and highlights the U.S.'s intent to disrupt China's aviation industry [4][6] Group 2 - The development of aircraft engines is a long-term process, and the U.S. ban on engine exports will directly impact China's ability to mass-produce its aircraft, revealing the U.S.'s malicious intent [6][8] - The U.S. may also leverage market access restrictions, such as not issuing airworthiness certificates, to further impede the sale of Chinese aircraft in international markets, even if they use domestic engines [6][8] - The development of China's C919 aircraft is being closely monitored, and the existence of domestic alternatives, such as the Y-20 military transport aircraft, serves as a reminder of the importance of using indigenous components to avoid reliance on foreign technology [8]