What information can an airplane black box record?

"Black box" is one of the special electronic recording equipment for aircraft. It recorded the important flight data of the plane before the accident. In order to ensure the safety of the black box, people specially designed a solid shell composed of several layers of protective layers, such as impact resistance, extrusion resistance, high temperature resistance, corrosion resistance and waterproof, which was installed at the relatively complete wing root of the aircraft tail in the air crash. There are two black boxes, which are divided into: cabin sound recorder and flight data recorder.

First, the cabin recorder

The in-cabin recorder is used to record the voice records and various audible sounds between the pilot and the cockpit, and between the pilot and the passengers in the cockpit. Can keep the cockpit 120 minutes without stopping recording all kinds of sounds. Including the conversation between the stewardess and the passengers. Generally speaking, we talk to each other from takeoff to landing. This is the most important reference if the plane is hijacked and there is an air crash.

Second, the flight data recorder

The flight data recorder records flight parameters, such as horizontal speed, vertical speed, acceleration and magnetic angle, at least for the last 25 hours before power failure.

Data is also divided into audio and video. Audio data generally includes the dialogue between the pilot and the co-pilot, the dialogue between the plane and the ground, and the dialogue between the crew and the ambient sound in the cockpit. Video data generally includes cockpit instrument display, pilot action, aircraft front view, landing gear retraction state, etc.

The black box not only records the state of the plane, but also records the pilot's operation. No matter whether the plane itself or human operation is improper, clues can be found from the data of the black box. Moreover, the data of the black box can be specific to a certain moment, a certain system, a certain variable, accurate to a certain value and a certain sudden data, which can be repeated repeatedly, and can objectively restore the whole flight process of the aircraft for accident investigation and analysis.

Through special data playback software, the flight process of the aircraft is reproduced intuitively and truly with black box data, and the possible hidden dangers and abnormal operation of personnel are automatically analyzed. Through these data, the causes of aircraft accidents can be quickly found, and at the same time, the hidden dangers in aircraft design can be found through analysis, which has made great contributions to preventing accidents from happening again and improving the safety level of aviation flight.

Supplementary information:

Why is it called a black box?

In the early days of the early aircraft, people would install all kinds of instruments on the aircraft, which were usually put in a strong black box. Later, people put some instruments in this black box in order to save important information before the plane crash. This is the birth of the black box.

But people soon discovered that it would be hard to find this black box if it was mixed with other black boxes after the plane crash. Mainly because black is not obvious, people painted the box with striking orange, and later added white reflective strips, so that it can be seen clearly in the dark. But the name of this black box hasn't changed. Because if people look for this kind of box, it is usually a time of disaster, then this day is also a dark day for everyone. "Black box" therefore represents misfortune, and the color "black" can better represent people's mood at that time.