The second black box is found, what information will we know?

　　Zhongxin Finance, March 27 (Ge Cheng) The second black box was found.

　　According to a CCTV News report on the 27th, a reporter from China Central Radio and Television learned from the front headquarters that at about 9:20 a.m. on March 27th, under the 1.5-meter soil layer on the hillside slope on the east side of the impact point, firefighters found an orange The tank, confirmed by experts, is the second black box of the "3.21" China Eastern Airlines flight accident passenger plane.

Details will be introduced at a subsequent press conference.

　　After both black boxes are found, what will work next?

What information can we possibly know?

Zhongxin Finance contacted Li Hanming, an expert from the Civil Aviation Resource Network.

Zhongxin Finance: MU5735 has two black boxes.

What are these two black boxes?

Li Hanming: The

so-called black box is actually two independent components: the flight data recorder (Flight Data Recorder FDR) and the cockpit voice recorder (Cockpit Voice Recorder CVR).

Zhongxin Finance: What is the responsibility of the flight data recorder (FDR) and the cockpit voice recorder (CVR) to record?

Li Hanming: The

flight data recorder can record the current state of the aircraft.

　　The technical term is called ("should state") - including speed (divided into the airspeed relative to the air recorded by the pitot tube, the ground speed relative to the ground recorded by the GPS, and the current wind speed, wind direction calculated by both ), heading angle, pitch angle (the nose is up is pitch, the nose is down is pitch), elevator position, rudder position and other information.

.

　　The cockpit voice recorder records the recordings in the cockpit of the aircraft.

　　Taking the specific operation process as an example, the specific process of aircraft operation is:

　　The two pilots in the cockpit realize cross-confirmation by voice. One pilot (called Pilot Monitoring) is responsible for communication with the air traffic controller. After hearing the command from the controller (or checking the corresponding column of the checklist), Recite (for example, "Altitude rise to 10,000 meters"), another pilot (called the pilot Pilot Flying) executes, and after confirming that the operation is completed accurately, repeat the command ("Confirm altitude rise to 10,000 meters"), monitor the pilot Confirm that it is correct to continue.

　　This process in the cockpit can be faithfully recorded by the CVR, so that investigators can understand the command execution intention of the crew in the cockpit.

Zhongxin Finance: Which of the two black boxes is more important?

What is the relationship between them?

Li Hanming:

Both of them are very important, and there is a

working relationship between them.

　　The cockpit voice recorder can only ensure that "the pilot has issued an order", and the flight data recorder can only ensure that "the system has received the order and turned the order into a control signal".

Zhongxin Finance: According to the Civil Aviation Administration, the first black box discovered cannot rule out the possibility of damage to the storage unit.

What effect might this have on the information recorded by the black box?

How long does the decoding take?

Li Hanming:

If the storage unit is damaged, how many record results can be retained is really unknown, and it needs to be determined according to the decoding results.

The decoding time depends on the situation, generally it takes about two weeks, but it may take longer if the damage is serious.

Zhongxin Finance: After interpreting the specific data, how to judge the cause of the accident?

What needs to be done next?

　　Li Hanming: After deciphering the data recorded in the black box, it is also necessary to observe the specific positions of the control machinery such as screws in the wreckage of the aircraft, including the rudder, elevator, flaps and other specific components, so as to judge whether the specific control signal has obtained the mechanical structure. implement.

Therefore,

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