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What's wrong with Boeing 737 Max8?

2019-3-11 14:34| 发布者: 左二爷| 查看: 181| 评论: 0|来自: 四川耍耍网www.scshuashua114.com

摘要: Ethiopian Airlines Boeing 737 Max 8 crashed shortly after take-off from Addis Ababa to Nairobi on the morning of 10 local time. Ethiopia Airlines said 149 passengers and 8 crew members on ET302 were k ...
Ethiopian Airlines Boeing 737 Max 8 crashed shortly after take-off from Addis Ababa to Nairobi on the morning of 10 local time. Ethiopia Airlines said 149 passengers and 8 crew members on ET302 were killed, including 8 Chinese passengers.

The wreckage of ET302.

The wreckage of ET302.

The crash was the second crash of a Boeing 737 Max 8 in five months. On the morning of October 29 last year, an Indonesian Lion Airlines Boeing 737 Max 8 crashed in the Java Sea 12 minutes after taking off in Jakarta, killing all 189 passengers and crew members on board. Although Essex Airlines said in its statement about the ET302 crash that it was impossible to guess the cause of the crash, many analysts began to question the safety of the 737 Max 8 model because the same model crashed in a short time.

The registration number of the crashed aircraft is ET-AVJ.

The registration number of the crashed aircraft is ET-AVJ.

The 737 Max series is the latest generation of Boeing's short and medium range narrow body 737, including 737 Max 7, 737 Max 8, 737 Max 9 and 737 Max 10. Among them, 737 Max 8 first flew in 2016 and officially delivered to MAINA in May 2017 to start its commercial operation. According to public statistics, 737 Max 8 is one of Boeing's most popular models at present. It has delivered more than 200 aircraft to many airlines, including Air China, China Eastern Airlines and other major airlines in China. According to information released by Essex Airlines, the wrecked Boeing 737 Max 8 airliner was delivered on November 15 last year with a flight time of about 1000 hours.

The wreckage of Lion Airlines flight JT610.

The wreckage of Lion Airlines flight JT610.

Shortly after the Lion Air crash, the focus of the accident investigation was on the 737 Max aircraft itself: there was a problem with its angle of attack sensor (AOA), which might feed back the wrong data. Bloomberg reported that when pilots fly manually, the problem causes sensors to give false data about the impending stall of the aircraft, and 737 Max automatically pushes the nose down.

Subsequently, Boeing issued a safety announcement to all airlines operating 737 Max series aircraft to instruct crew members how to deal with the erroneous data of angle of attack sensors through existing flight procedures. Angle of attack is an important index in flight. If the angle of attack is too large, it will cause stall, which will make the wing lose lift.

The Federal Aviation Administration (FAA) also issued an emergency airworthiness order on November 7 last year, pointing out that the flight control system of the 737 Max aircraft may repeat the command to downgrade the nose when the angle of attack sensor data is wrong. "If this situation is not solved, it may cause the crew to have difficulty in controlling the aircraft, leading to excessive dive, serious altitude drop and contact." The earth. " The FAA requires operators and owners of the aircraft to revise the contents of the flight manual within three days of receipt of airworthiness instructions.



Just three days before the second crash of 737 Max 8, 17 family members of Lion Airlines filed a lawsuit in the United States against Boeing, claiming that the accident was caused by the failure of a new aircraft control system installed on the 737 Max aircraft: if the sensor detects a high-speed stall, the system will downgrade the nose without pilot control. The family's attorneys also said that Boeing did not mention the new system in the pilot's flight manual, and that the pilot would not be notified when the system started automatically. According to the Seattle Times, it was this system failure that allowed Lion Airlines to conduct a 12-minute "saw-pull battle" in the air - the system that received the wrong data repeatedly pushed the nose down, and the pilots kept lifting it up again, eventually causing the plane to lose control and fall into the Java Sea.

Earlier, Dennis Mirenberg, Boeing's chief executive, stressed that the company still believed that 737 Max was a safe aircraft. After the ET302 accident, Boeing issued a statement saying that it had been informed of the report of the aircraft accident and was closely monitoring the situation. Boeing stands ready to support the Ethiopian Airlines team and the technical team stands ready to provide technical assistance as requested by the National Transport Safety Commission of the United States.

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