1. Rolls-Royce Company in the UK (under BMW),
2. American General Dynamics Company
3. Pratt & Whitney Group Corporation (Pratt & Whitney for short)
4. United Russian Engine Manufacturing Group Corporation (mainly composed of the following Russian aero-engine enterprises: Sulit Company, Saturn Company, Emsk Factory, Ufa Company, Perm Company, Krimov Design Bureau and Chernichev Production Plant under MIG Company).
Aero-engine is a highly complex and precise thermal machinery, which provides power for aircraft flight. As the heart of aircraft, it is known as "the flower of industry", which directly affects the performance, reliability and economy of aircraft, and is an important embodiment of a country's scientific, technological, industrial and national defense strength. At present, there are only a few countries in the world that can independently develop high-performance aero-engines, such as the United States, Russia, Britain, France and so on, and the technical threshold is very high.
Xu, director of the Bureau of Science, Technology and Industry for National Defense, said recently that China's equipment should be upgraded in conjunction with the preparation of the National Defense Science, Technology and Industry 2025 and the 13th Five-Year Plan for integration of defense and civilian technologies. Driven by the "Made in China 2025" strategy, all industries are actively undertaking and formulating their own industry plans. The statement of the National Defense Science and Technology Bureau confirmed for the first time that "National Defense Science and Technology Industry 2025" is being compiled in the military field.