A Boeing 737 of China Eastern Airlines crashed. How to evaluate its security?

Boeing 737 is the best-selling passenger plane in the history of civil aviation. Since its birth, there have been many orders. At present, more than 1 10,000 aircraft have been produced, breaking the Guinness World Record. 1250 Boeing 737s fly in the sky every second in the world, and 1 Boeing 737s take off and land every five seconds. As a star model of Boeing, China bought a large number of Boeing 737-800s in 2005, and after 20 1 1 year, more 737-800s poured into China. China's three major airlines account for about 40% of related aircraft types, among which China Eastern Airlines will have 292 737s in 2020.

There are many reasons for the crash of Boeing 737, including misoperation, poor maintenance, engine failure, landing gear failure and so on. There is a major flaw in the rudder design of 737CL, which may get stuck or even reverse completely under extreme temperature difference. This defect led to the air crashes of United Airlines Flight 585, American Airlines Flight 427 and Dongfeng Airlines Flight 5 17. In 20 13, the Federal Aviation Administration of the United States considered that Boeing 737NG and all 737OG/CL with new tail rudder had potential safety hazards, and some bolts of its horizontal wing were coated with protective coating during the manufacturing process, which might lead to bolt looseness, affect flight safety and even lead to aircraft out of control. In 20 19, Boeing found structural cracks during the modification of the 737-800 series passenger plane used by China Company, which may lead to disintegration in the air. The U.S. official ordered the inspection of 165 Boeing 737 NG.