The Chinese plane approached the speed of sound before "plugging straight" to the ground, President Putin's condolences

Aviation safety experts are analyzing video recording the vertical plunge at 560km / h of the Boeing 737 that crashed on March 21.

"Preliminary data suggest that the plane was close to the speed of sound," said John Hansman, a professor of aeronautics at the Massachusetts Institute of Technology (USA) and a reviewer of Bloomberg's calculations. "The plane went down at a very deep angle."

The Boeing 737-800 that crashed in Guangxi province on March 21 plunged at a speed of more than 966 km / h, sometimes exceeding 1,120 km / h, Bloomberg reported on March 23 after analyzing data from the website. FlightRadar24 aircraft tracking.

Sound travels at a speed of more than 1,220 km/h at sea level, but slows down at higher altitudes because the air temperature gets lower and higher. At an altitude of 10,668 meters, the speed of sound is about 1,067 km/h, according to Bloomberg.

Meanwhile, Russian President Vladimir Putin offered his condolences to Chinese President Xi Jinping after reports of casualties in the plane crash in China. Many other countries also sent condolences.

"Accept my most sincere condolences. Russia feels the pain of those who lost their families in this tragedy," Russian President Vladimir Putin expressed sympathy through a post on the Ambassador's Weibo. Russian restaurant in Beijing.

Russian Prime Minister Mikhail Mishustin also offered his condolences to Premier Li Keqiang over the plane crash.

The US Embassy in China also expressed its deepest condolences: "We stand ready to support the investigative effort and wish to pay our respects to the emergency responders at the scene of the accident. ", the South China Morning Post reported.

The US National Transportation Safety Board has also appointed a representative to help China investigate the cause of the accident.

Meanwhile, the Taiwanese leader also offered condolences through a spokesman on the evening of March 21. "This is a very big tragedy and we feel very sorry. We are ready to provide all necessary support," Ms. Tsai Anh Van said.

Canadian Prime Minister Justin Trudeau expressed his sympathies to the families of the victims on Twitter.

European and Asian leaders also offered condolences to the families of the victims of the plane crash.

Italian President Sergio Mattarella sent a letter of condolences to President Xi Jinping on behalf of the Italian people. British Prime Minister Boris Johnson also tweeted that he sympathizes with the families of the victims and appreciates the efforts of the emergency relief team.

Saudi King Salman and Crown Prince Mohammed bin Salman have sent their condolences to Chinese President Xi Jinping over the plane crash. The Saudi Foreign Ministry also expressed its sincere condolences to China.

Many other countries also sent condolences to China over the plane crash. Including Prime Minister of India Narendra Modi, Government of Jordan, Government of Singapore, Government of Egypt...

Regarding the cause of the plane crash, investigators have not yet announced the recovery of the plane's black box - a highly protected device that records information such as the aircraft's activities, the mission of the aircraft. power and cockpit sound.

When investigators examine the wreckage, they will particularly focus on the "trim tab" on the "elevator" located at the rear of the plane's horizontal tail. The "Elevator" can rotate up or down to control the aircraft up or down along the vertical axis of the aircraft.

The "Elevator" is controlled via the joystick in the aircraft cockpit. When the pilot pulls the lever toward him, the elevator rotates upward, causing the tail of the plane to move downwards while pushing the nose of the plane up. The "trim tab" moves according to the pilot's preferences for the purpose of assisting in controlling the status of the aircraft, helping the pilots to control the aircraft more easily.

Juan Browne, a Boeing 777 pilot and well-known aviation vlogger specializing in analyzing aviation incidents, said: "There's really only one thing that can cause a plane to fall vertically and that's the elevator or trim tab. ". "To me, the video data shows that the plane was intact when it hit the ground," Browne added.

According to the Civil Aviation Administration of China (CAAC), a Boeing 737-800 of China Eastern Airlines (China) carrying 132 people on board crashed and caught fire in a wooded mountainous area in the northern province of China. Wuzhou city in Guangxi province, southern China on the afternoon of March 21.

This crashed flight, MU 5735, took off from Changshui airport, Kunming in Yunnan province, southwestern China at 13:15 on March 21 and was expected to arrive in Guangzhou city, Guangdong province, southern China. China at 3:07 pm on the same day.

The plane carried 132 people on board, including 123 passengers and 9 crew members. China Eastern Airlines confirmed that there were casualties after the accident, but did not specify the exact number.

According to China Central Television (CCTV), Chinese President Xi Jinping called for all-out rescue efforts and found the cause of the accident as soon as possible.

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