The Shenzhen passenger plane arrived safely after a sudden descent from high altitude. What was the cause of the accident?

Recently, a passenger plane in Shenzhen issued an emergency code during the flight. The airline issued a statement that it was due to an abnormal pressure increase instruction and then made an emergency landing because the passenger plane had plummeted by nearly 6,000 kilometers in five minutes. Meter height, fortunately, the man and the aircraft finally returned safely.

About 20 minutes after the passenger plane took off from the airport, there was a sudden drop in altitude. Afterwards, the airline issued a statement that it was because the pressurization instructions were abnormal and it was returning, so it issued the transponder emergency code 7700. This code This code is sent when the passenger plane encounters an emergency, such as a mechanical failure or when passengers require emergency rescue.

It is understood that when the aircraft loses cabin pressure or breaks the glass during flight, the altitude of the aircraft will be reduced in a short period of time to ensure the safety of the aircraft body and passengers, resulting in changes in the altitude of the aircraft. Later, during the alternate landing process, the plane's emergency situation was under control, the transponder code was changed from 7700 to a normal code, and the crew could control the plane to land normally.

Previously, before the situation was clearly investigated, some media claimed that the plane plummeted to an altitude of 6,000 meters in two minutes. This statement has been refuted. Because according to relevant sources, a drop of six thousand meters in two minutes means that the altitude will drop by fifty meters in one second. Such a speed may cause the aircraft to disintegrate. If you think about it, you will see such a drop. The rate is simply impossible. For the statement that the aircraft plummeted to an altitude of 6,000 meters in two minutes, the altitude and time data of the aircraft's sudden descent are inaccurate.

According to the radar data of the passenger plane, the plane began to descend from an altitude of 9,200 meters at 7:52:49, and reached 3,600 meters at 7:57:56, which lasted 5 minutes. The plane involved The average descent rate is 1100 meters per minute, which is within normal range.

As for the reason for the "abnormal pressurization indication" in the Shenzhen Aviation Bulletin, the reporter interviewed senior captain Chen Jianguo. Captain Chen Jianguo said that there are many reasons for the abnormal indication, and the indication display problem requires further official investigation.

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