The passenger plane of China Eastern Airlines dropped rapidly, and the crew did not respond. What could be the cause of the accident?

The passenger plane of China Eastern Airlines dropped rapidly, and the crew did not respond. What could be the cause of the accident? The air crash of China Eastern Airlines is really tragic! Judging from the video, the plane was a death dive. The nose of the plane is facing the ground. Why not tilt it up? I don't think planes can be manipulated. Now, all planes have automatic pilot systems and rely on computers to control them. However, when there is something wrong with the computer, the plane is finished. I've been on a plane, only twice. In fact, the subconscious is a little nervous. It is said that airplanes are the safest and quickest means of transportation. I don't think so. The airports of every city are in the outer suburbs of dozens of kilometers, and they arrive by airport bus, so there is nowhere to go when checking in. As far as safety is concerned, objectively speaking, air crashes still exist. Although the probability is low, the result is destructive. At an altitude of10,000 meters, it is physically parabolic, and there are no bones left, which is terrible. Here, I deeply mourn for all the victims. When Long song cried! I want nothing more, you and I are fine!

The plane didn't get lost or run out of fuel, so it's hard to say whether the plane broke up before it hit the ground. It may have partially disintegrated before it hit the ground under a huge overload, but this does not affect the problem of the tail rudder. If the weather, loss of contact, exhaustion of fuel and other factors are excluded, it is most likely that the tail rudder is stuck. It's not the first time that the tail rudder of Boeing 737 crashed. I don't know the specific tail rudder structure of Boeing 737-88NG. Of course, accident analysis and investigation are not the same thing. It is suggested to check the tail rudder and collect the tail rudder fragments as much as possible. After the tail rudder is stuck, the attitude change of the aircraft is very consistent with the recorded flight trajectory, that is, the altitude drops sharply and the speed rises sharply. I think it's possible. When the plane swoops down at a vertical high-speed flight angle, all people and objects on board will fall forward, that is, in the direction of the cockpit. Because the speed of hitting the ground is too fast, the fragments after the impact of the nose should be inserted in the soil or scattered around, and people should be torn, so it is difficult to find them intact. Silent for everyone on board, hoping for a miracle.