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How will the black box of the Boeing 737-800 plane that crashed in China be handled?

According to an official with China’s aviation regulator, the black box found was “severely damaged” and they could not determine whether the black box was the flight data recorder or the cabin voice recorder. drive.

The official further revealed that both of the plane’s black boxes were manufactured by American technology corporation Honeywell, but did not specify the specific model.

How will the black box of the Boeing 737-800 plane that crashed in China be handled?  - Photo 1.

Rescuers search for a black box at the plane crash site in Teng county, Wuzhou city, Guangxi Zhuang Autonomous Region, China on March 22. Photo: Xinhua News Agency

What is a black box?

Contrary to the name, the black box is orange. An aircraft’s black box is a device that stores important information about a flight’s data since take-off, such as speed and altitude.

Many researchers believe that the plane’s black box was invented by Australian scientist David Warren in the 1950s.

The purpose of this device is not to determine liability, but to determine the cause and help prevent accidents.

The black box weighs about 4.5kg and contains 4 main components: a frame designed to protect the device and facilitate recording and playback, a beacon for underwater navigation, and a core or memory housing made of stainless steel. or titanium and inside there are recorders.

There are two recorders, the cockpit voice recorder (CVR), which records the pilot’s voice and cockpit sounds, and the flight data recorder (FDR) to record information about parameters including altitude , airspeed, direction and thrust of the engine.

How will the plane’s black box be handled?

Once the black box is found, a technician will peel off the protective material and carefully clean the connections to make sure they don’t accidentally delete data. They will then download or copy the audio and data files. The data will be decoded from the raw files before converting to graphs.

Investigators sometimes have to use “spectral analysis,” a way of analyzing acoustics that allows scientists to recognize the barely audible alarms or the first fleeting burst of an explosion.

The amount of data obtained by each black box will be different. In the case of China Eastern Airlines’ Boeing 737-800, it’s unclear how much data Honeywell’s black boxes will record.

Before that, an Air India Express Boeing 737-800 with two Honeywell black boxes that crashed in 2020 had a CVR with 120 minutes of digital audio playback. The Air India Express on-board FDR recorded approximately 25 hours of flight data.

Many experts hope that the black box can record enough data during the 66-minute flight of China Eastern Airlines.

How long will there be results from the black box?

Chinese officials did not disclose where they would read the data from the black box. In accident investigations, aircraft black boxes are often read in the water if the technology is available.

If the recorder is severely damaged, readings may be handed over to a foreign agency or equipment manufacturer.

Chinese officials have not announced when the results from the black box will be available. This will depend in part on the condition of the recorders and where the data is to be analyzed.

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