At 10:33 on May 28, 2023 (Beijing time), China Liying, China Eastern Airlines flight MU9191 took off from Shanghai Hongqiao Airport, arrived at Beijing Capital International Airport at 12:31, and then passed through the "Watergate", which symbolized the highest etiquette of civil aviation. The domestic large passenger aircraft C919 has achieved a complete success in its first commercial passenger flight worldwide. From its establishment in 2007 to its first flight in 2017, and now to its commercial debut, the C919 has been highly regarded by foreign media as confirming China's leading industrial strength and marking a new stage in China's aviation manufacturing industry. However, while the people of the whole country are generally proud and excited, there are also some who say that the C919 is "yellow skin and white heart". Apart from the outer shell, everything inside is foreign, assembled goods, rather than domestic products. This kind of argument is too insecure. In fact, the C919 is a genuine domestic aircraft, a self soaring Sky Shadow! 1 The advanced "eyes" and "wings" C919 is not for beauty, but for aerodynamic characteristics that reach or exceed the Vanguard International Semiconductor Corporation's advanced level. Only in this way can we surpass similar models in terms of speed and economic efficiency. What makes the C919 a genuine domestic aircraft? Independently formulate the overall plan for C919; Independently designed and tested the aerodynamic shape; Independently complete the design, calculation, testing, and manufacturing of the body; The avionics system, flight control system, air management system, etc. are jointly produced by well-known foreign suppliers such as General Electric, Collins, Honeywell, and Chinese enterprises. Compared to bricks, tiles, cement, and steel bars for builders, the difficulty of the aviation manufacturing industry also lies in integration. The durability and economy of large civil aircraft are very important. This is not only credibility, but also life. Therefore, not only are the requirements for pneumatic layout very strict, but the requirements for the body are also to have both reliable structural strength and as lightweight as possible. To obtain an optimal aerodynamic layout, in addition to conducting wind tunnel simulations, supercomputing models are even required. There are many unique and advanced aspects of C919. Let's talk about the windshield first. The C919 nose has only four windshields, while Boeing 737 series and Airbus A320 series aircraft have six windshields. The design of C919 not only means that pilots have a broader vision, but also is the result of progressiveness technology. A plane needs to travel through wind, rain, thunder, ice, frost, and heat, as well as through the long years. The number and size of windshields used are not arbitrary. This involves many aspects of science, such as materials science, aerodynamics, etc. If the windshield of an aircraft breaks or falls off in the air, it will be fatal. The cruise altitude of civil aviation passenger aircraft is usually between 7000 and 12000 meters above sea level, and the upper limit of this altitude is higher than Mount Everest, the highest peak on the earth. When the aircraft reaches this altitude, the pressure difference inside and outside the cabin will generally be about 8 times. In order to ensure that the pressure inside the cabin is suitable for human breathing, pilots will use relevant equipment to pressurize the cabin during cruising. If the windshield suddenly breaks or falls off, the entire cabin will instantly lose pressure, resulting in thin air and excessive pressure inside and outside the human body