When the autopilot then switched off, the pilots were probably distracted by an abrupt tilting of the aircraft and tried to bring the jet back under control by pulling the plane up too steeply. However, here the aircraft was already at cruising altitude. During the landing attempt it stalled and then crashed.ĭuring Air France flight 447 in 2009 the Pitot tube probably iced up. Indonesia's chief investigator Nurcahyo Utomo explains the events, that led to the Lion Air crash in 2018.ĭuring the Aeroperu flight, the crew was able to initiate a landing manoeuvre. Read more: Boeing 737 MAX: a plane of compromise The pilot ignored the correct data from a second sensor and a warning signal about the impending stall because he was probably confused and overwhelmed by the wrong speed information. In the case of the Birgenair flight, the pilot tried to counteract this by pulling up the nose of the aircraft - a devastating mistake. In both cases the Pitot tube signaled to the pilots a speed that was much too high. The problem was, nobody had removed the tapes before the start. Only the tube was not dirty there, but taped up as a precaution. A very similar cause was found in the crash of Aeroperu flight 603 in the same year. Dust had probably accumulated in the speed measuring tube. In three flight accidents in recent decades, a faulty speed measurement with a so-called Pitot tube was the cause of the crash: Birgenair flight 301 crashed in 1996 during the climb in the Dominican Republic. The black box of Air France Flight 447 was found at the bottom of the Atlantic Ocean. Read more: US demands Boeing make changes to 737 Max 8 If they now rely on the defective sensor, this quickly leads to disaster. However, they must also be able to recognize which of the two sensors is wrong. If the sensor that dispalys this data is defective, the pilots must switch to a backup sensor. In any case, it is important that the pilots know their speed and the angle of attack of the wings. If the thrust decreases during climb, this inevitably leads to a considerable loss of speed. Shortly after take-off, an aircraft needs considerable thrust in order to simultaneously increase its speed and gain altitude. If it does not reach the necessary stallspeed, the stall occurs. The slower an aircraft flies, the higher the angle of attack must be in order for the aircraft to have enough lift. Commercial aircraft are most frequently involved in accidents at this phase of the flight. Especially when climbing, such situations almost always end in a crash.
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