What is the black box on the plane for?

Recently, air accidents have become an infectious disease all over the world, and many countries and regions have experienced the tragedy of plane crashes. While people are looking at rescuing survivors and salvaging the bodies of victims, they are also looking at a device – the black box, which tells us why the plane crashed. The black box, which is used as a "witness" to the flight condition of the aircraft, is not actually black, but often orange-red.

Because it can help decipher the secrets of flight accidents, especially the flight status of the plane at the moment of the crash and some time before the crash, it is called the "black box". The black box shell is solid and cuboidal, approximately equal to.

Four or five bricks are generally large together. Inside it is purely some electrical components, which are essentially a transceiver. During the flight of the aircraft, it can receive all kinds of information collected by the sensors in the aircraft in time, and automatically convert it into the corresponding digital signal for continuous recording; When a plane crashes, an emergency locator transmitter that relies on a black box automatically emits a radio signal with a specific frequency (e.g., 37 5 kHz), similar to a heartbeat, in all directions, to "announce" its position so that the seeker can trace the wave.

In 1974, a Boeing 707 crashed to the bottom of the ocean at a depth of more than 3,000 meters, relying on this radiolocation signal to find the black box. Because of the limited battery capacity in the box, the positioning transmitter usually only works continuously for a few months. If the salvage is not timely, the black box will disappear.

There are usually two black boxes on each aircraft, and their scientific names are "flight data recorder" and "cabin voice recorder" respectively. The former mainly records various flight data of the aircraft, including flight attitude, flight trajectory (track), flight speed, acceleration, latitude and longitude, heading and various external forces acting on the aircraft, such as drag, lift, thrust, etc., a total of about 200 kinds of data, which can retain more than 20 hours of flight parameters. After this time, the data logger automatically spits out the old and the new is overwritten.

The cabin voice recorder mainly records the calls between the crew and the ground personnel, the conversation between the crew members, and various sounds in the cockpit (including the sound of aircraft engine operation). It works like a regular tape recorder, which runs over and over again, constantly recording the last half hour of various sounds. A flight usually goes through 8 stages (takeoff, initial climb, climb, cruise, descent, start approach, final approach, landing), and each stage is not aimed at the "ears" of the black box. Wish.

The main function of the black box on the aircraft is to record the altitude, speed, heading of the aircraft, the conversation in the cockpit 30 minutes before the plane crash, the sound of the engine and the alarm sound. The black box on the aircraft is the flight data recorder, and the aircraft is equipped with these two black boxes, one is the flight data recorder, which records all the data of the flight; The other is the cabin sound recorder, which records the voice of the crew. The black box on the aircraft is generally installed at the tail of the aircraft, which is not visible to ordinary people, and can only be seen by aircraft maintenance personnel.

The black box is not black, it is painted a bright orange color to make it easier for people to search.

For the sake of convenience, a parachute is also placed on the black box, which can automatically pop out and land safely when the aircraft reaches a certain limit. To ensure safety, it is usually installed away from the tail wing root in the center of the aircraft.

The cost of a black box is expensive, and a black box costs about 10,000 to 15,000 US dollars, because in addition to the precise data recording function, the black box must also withstand the interference of external factors.

The black box is a recording instrument on an aircraft, and one is a flight data recorder. It can record the aircraft's altitude, speed, heading, climb rate, descent rate, acceleration, fuel consumption, landing gear release, Greenwich Mean Time, as well as flight parameters such as aircraft system working conditions and engine operating parameters. The other is the cockpit voice recorder.

It is actually a radio call recorder that can record all kinds of calls on the plane.

The four audio tracks on this instrument record the conversation between the pilot and the ground command organization, the conversation between the principal and co-pilot, the captain's and stewardess's threats to the passengers, the abnormal engine sound, and various sounds in the cockpit. The black box provides investigators with information about the operation of the aircraft's systems prior to the accident. Because air crashes occur in a short moment, sometimes the pilot and all flight attendants are killed at the same time, it will be very difficult to investigate the cause of the accident, and the flight data recorder can provide people with the moment of the plane crash and the period before the crash, the flight status of the aircraft, the working conditions of the equipment on board, etc.

The cockpit language recorder can help people analyze the cause of the accident according to the various conversations of the people on board, so as to make the correct conclusion about the accident.

In the aftermath of the plane accident, people are looking for the "black box" that was originally installed on the plane to find out the truth about the crash, so what is the black box?

The "black box" is one of the special electronic recording equipment for the aircraft, which is equipped with a flight data recorder and a cabin sound recorder, and all mechanical parts of the aircraft and electronic instruments are equipped with sensors connected to it. It can record the relevant technical parameters and the sound in the cockpit half an hour before the plane stops working or crashes.

The black box is a metal box that houses specialized recording equipment and electronic testing equipment. The recording device can automatically record the conversations of the flight crew, external communications, and other sounds in the cockpit. The test equipment, on the other hand, automatically records aircraft data through various sensors and transmitters on the aircraft.

The black box is an electronic recording device for aircraft, and the scientific name is aviation flight recorder. The flight data recorder and cabin sound recorder can record the relevant technical parameters and the sound in the cockpit half an hour before the crash for experiments and accident analysis. It has the ability to resist fire, pressure, and seawater immersion, so that the data can be stored safely.

The "black box" is one of the electronic recording devices dedicated to aircraft, called the aviation flight recorder. All the causes of air crashes in the world are found through black boxes.

It is the "aviation flight recorder", which is equipped with a flight data recorder and a cabin sound recorder. It can record the relevant technical parameters and the sound in the cockpit half an hour before the plane stops working or crashes for flight experiments and accident analysis.

"Black box", called Aviation Flight Recorder. It is equipped with a flight data recorder and a cabin sound recorder, which can record the relevant technical parameters and the sound in the cockpit half an hour before the plane stops working or crashes, and re-releases the recorded parameters when necessary for flight accident analysis.