The latest data from the investigation of the crash, march 10, at the cost of 157 people, shows that the pilots probably tried to follow Boeing’s instructions for dealing with the problems that can occur with the anti-stallsystemet MCAS.
the Instructions were developed after the suspicion that the MCAS has caused a similar crash in Indonesia in October. The hypothesis was that the automated MCAS överkompenserade in the case of suspected so-called överstegring, when an aircraft loses lift force to the nose lifted sharply.
and the controls down the nose of the plane, but it is suspected to have taken in too much.
According to the instructions would be the pilots in the event of such problems, inter alia, disconnect the power to the MCAS, something that the crew of the Ethiopian Air plane also did, writes the Wall Street Journal, which refers to sources in the investigation.
the Pilots then tried to manually stabilize the plane, but decided then to turn on the power to the electric sliders and then also went to MCAS system up and running again, and continued to press down the nose of the plane.
according to the instruction is physically not very easy, according to a pilot who Reuters talked to.
– You must – or rather they – need to trap out a handle and crank, similar to a båtvinsch.
According to the Wall Street Journal, it is thus likely that the pilots, when this became too difficult, tried to steer with the plane’s electrical controls, after having sat on the power to them again. According to the instructions would, however, let the power be after that linked from the MCAS system.
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