On August 9th, the altitude of ZH9209 passenger plane of Shenzhen Airlines plummeted, and it took only five minutes to drop from 9297 meters to 3733 meters. The crew then issued an emergency code of 7700. After proper handling, it shows that the aircraft emergency is under control and the crew can control the aircraft landing normally. After landing, neither the crew nor the passengers were injured. If I am on the plane, I will be very scared, but now our captains are professionally trained, so as long as we listen to the stewardess, there will be no danger. Shenzhen Airlines flight ZH9209 returned due to mechanical failure, and the crew handled it properly. At present, it has safely returned to Shenzhen Baoan International Airport. In fact, the descent of an airplane is a very complicated process, and there are many reasons for the sudden descent of the airplane. Landing is to reduce the thrust of the engine and the speed of the aircraft, thus reducing the speed of airflow through the wing and then reducing the lift, thus making the aircraft plummet. Landing is very complicated, which tests the captain's skills. If the descent speed is too fast, sometimes it will be difficult for the pilot to pull up the plane again, which may lead to a crash and the descent speed is too fast.

According to media reports, the reason for the emergency landing of Shenzhen Airlines passenger plane for 6 kilometers is that the cabin pressure loss leads to the height change of the passenger plane, which should be reduced in a short time, otherwise it will endanger the safety of the plane and passengers. Now the plane is flying at a high altitude, and the higher it flies, the more dangerous it is. In order to make pilots and passengers work and live comfortably, the cabin of the aircraft is sealed. With the increase of altitude, the pressure difference between inside and outside the cabin is appropriately increased so that the internal pressure will not be reduced too much. ?

At 9: 0013, Shenzhen Airlines ZH9209 returned due to mechanical failure, and the crew handled it properly. At present, it has landed safely at Shenzhen Baoan International Airport, and the crew controlled the plane normally on the way back. After landing, neither the crew nor the passengers were injured. Shenzhen Airlines will arrange other flights to transport passengers. The cause of the accident is still under investigation. ?

If the cabin loses pressure when the plane flies at high altitude, it will cause the passengers' bodies to expand instantly, and if the suffocation is serious, it will lead to death. It will take some time, and the air pressure in the cabin must be relatively stable, so that the pilot can have enough time to let the plane descend.