Black box also has a name, which is actually called aviation flight recorder. Although we are used to calling it a black box, we naturally think of it as a black box. But in fact, its appearance is not only black, but also unlike a box.

The real black box, in fact, is conspicuous orange, in order to find it easily after missing. And its shape is not like a box, but a combination of a cuboid and a cylinder. The reason why it is dubbed the black box is actually because all kinds of electronic instruments of early airplanes are stored in black square boxes, which are called "black boxes".

Later, when the "new" black box was invented, it continued to use this name.

After talking about the appearance of the black box, Dachuan will talk about the main purpose of the black box.

The driving recorder on the car is believed to be familiar to everyone. Simply put, the black box on the plane is similar to the driving recorder on the car. But unlike the driving recorder, the content and data recorded by the black box are more detailed.

Black box is mainly divided into two parts, cockpit voice recorder (CVR) and flight data recorder (FDR).

The former can record the dialogue between the pilot and the ground, the dialogue between the pilot in the cabin, the dialogue between the crew and the passengers, and the sounds of the aircraft engine and explosion. The latter is used to record various data parameters in the flight process of aircraft, such as flight speed, flight orbit, latitude and longitude, resistance, lift and thrust. These data add up to at least 60 kinds.

The recording of these sounds and data can help maintenance personnel quickly find the problems of the aircraft so as to repair the fault points. And when the plane has an accident problem, the cause of the accident can be traced back.

This is also the reason why the relevant personnel must find the black box after the plane crash of China Eastern Airlines.

How powerful is the black box?

Generally speaking, no matter how big an accident the plane encounters, the black box will always be unscathed, which is entirely because of the "importance" of the black box. Because the existence of the black box is related to the traceability of the whole plane accident, it must not be damaged.

Usually, the black box is often placed in the safest position of the plane, that is, the tail of the plane, which is summarized by scientists after analyzing a large number of plane accidents.

Of course, in order to protect the data in the black box from being destroyed, it is not enough to just put it in a relatively safe place.

Scientists have long been prepared for this.

We can see that the shell of the black box is very thick and special hard steel. With this sturdy shell, the black box can withstand the extrusion of a 2-ton object for 5 minutes.

In addition to being strong and pressure-resistant, the special design of the black box also gives it special abilities such as high temperature resistance, waterproof and acid resistance. With these abilities, it can last for at least half an hour even at the high temperature of 1 100℃, and it can last for several months even if it is soaked in various liquids.