Who can tell me about the plane crash? Besides, what is a black clip?

Simply put, there is no signal on the radar. The so-called "black box" is the flight recorder installed on the plane. "Black box" can be divided into two types according to its different functions: one is flight data recorder and the other is voice recorder. The flight data recorder is usually installed above the top of the back cabin of an aircraft. As long as there is one engine in flight, it can keep automatic recording and work continuously for 20 to 50 flight hours. It can record the flight state information of aircraft, such as altitude, speed, heading, vertical overload, pitch, roll, control surface deflection, lift, resistance, engine power, etc. Generally, the "black box" on small and medium-sized passenger planes can record more than 10 kinds of flight data, while large passenger planes can generally record more than 100 kinds, and some even reach more than 2,000 kinds. All kinds of recorded data have to be decoded by special institutions before people can understand them.

The tape recorder is installed at the back door of the cargo hold of the aircraft. It is used to record the pilot's conversation in the cockpit and the contact between the pilot and the ground half an hour before the plane stops, and even the speech of the pilot without a telephone can be recorded.