by Leonard Berberi
China Eastern Airlines Boeing 737800 crashed on April 21. The causes are still unclear: there are two hypotheses in the field. The recovery of 49,117 debris was completed. 370,000 square meters of land sifted. Waiting for the analysis of the black boxes
The China Eastern Airlines Boeing 737800 crashed at almost the speed of sound and broke into over 49,000 pieces, some of which landed at a depth of twenty meters. Now the debris must be collected in a large hangar to rebuild the plane to investigate in detail what happened to flight MU5735, which immediately killed 123 passengers and 9 crew members. But the dynamics remain a mystery even to aviation security experts who have worked on investigative teams around the world for decades. We must therefore await the first preliminary report on the incident, which is due to be published at the end of April.
The trip
The plane took off on March 21 at 1:16 p.m. local time (6:16 a.m. Italian time). At 2:17 p.m. it flew into the Guangzhou Flight Information Region, where it lost altitude without warning at 2:20 p.m. The person in charge of the area control center who was in charge of managing this flight called the crew several times, but received no answer. N, from the stand they sent an emergency call as expected by the courier and confirmed by local authorities. Forty seconds before the crash, the Boeing 737800 regained some altitude, but shortly thereafter at 2:23 p.m. the radar stopped receiving signals from the jet after another abrupt descent.
The speed
What happened in those minutes? An analysis by Corriere a few days ago calculated that the Boeing was traveling close to the speed of sound and went well beyond its structural limits when it crashed, causing it to lose parts (the tips of the wings) before the crash. The plane touched 1,125 kilometers per hour at an angle of 89 degrees to the expected trajectory 15 seconds after beginning its dive: at that moment and at this altitude (2,393 meters), the speed of sound is estimated at 1,190 kilometers per hour. . .
The Recovery
The recovery activities were not easy. In ten days on the ground rough and muddy 50,000 people took turns scouring 370,000 square meters of space just below the Vatican’s surface and excavating 22,000 cubic meters of earth. Five drone units scanned 10 million square meters. In total, according to local authorities’ calculations, 49,117 aircraft parts were recovered, including the two black boxes one that records the cockpit audio, the other that stores all the technical parameters of the flight from which we are trying to extract the data, including in the laboratories of the NTSB (the US Transportation Bureau of Investigation) in Washington, a spokesman confirmed.
The investigation
It’s these recordbreaking numbers that impress the pundits. Also because several routes have been excluded in the last few days. The terrorist attack, for example, not only because of the lack of explosives in the debris, but also because the plane was actually intact before it fell apart on the ground. The two pieces recovered a few kilometers away the ends of the wings don’t hit the insiders because it’s a material that doesn’t destabilize the plane if it detaches. In fact, it is likely that the detachment is due precisely to the high touched velocity, close to that of the tone.
The two hypotheses
All attention is focused on the nosedive of the Boeing 737800. A trajectory that can usually be obtained in different ways, two experts consulted by the courier explain: a serious malfunction on board that has caused the horizontal stabilizers (in the tail) to always keep the plane’s nose down, or the intentional one Gesture of who was behind the wheel at that moment, heading straight for the ground at maximum speed. In both explanations there is a question that for the time being has no possible answer: why the jet briefly regained altitude forty seconds before the crash and then crashed again.
April 4, 2022 (change April 4, 2022 | 19:00)
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