Tragedy: The Ethiopian Boeing software has been reactivated several times before crashing

SEATTLE.- The anti-lock software of the

Boeing

737 MAX of
Ethiopian Airlines, which crashed on March 10, was reactivated up to four times after the crew shut it down due to suspicious sensor data, two people said.

The crew chose not to restart the system, which lowers the nose of the aircraft, but a source close to the subject indicated that the researchers were badyzing the possibility that the software restarts without human intervention.

A spokeswoman for Boeing declined to comment. Ethiopian researchers were not available to comment on this information.

Boeing anti-lock software, called MCAS, is at the center of the Ethiopian Airlines crash investigation and similar device.
Lion Air crashed in Indonesia in October. The sum of the victims of the two tragedies amounts to nearly 350.

Informed people during the investigation indicated that the software, which automatically presses on the nose to prevent memory loss, was activated by erroneous data on "the angle of attack "coming from a single sensor.

The investigation has now focused on how the pilots initially disabled the MCAS system after an emergency review procedure, although it appeared to work again later and again before the aircraft crashed at soil, sources said.

A directive issued after the accident in Indonesia ordered the pilots to use buttons to disable the system in case of trouble and leave it off. This maneuver does not completely disable the MCAS, but cuts an electrical link between the software and the device systems, said a person familiar with the technology.

Investigators investigate whether there is a situation in which the MCAS can only be reactivated automatically, without the pilots canceling their stop maneuver. Boeing is updating the software and will also add additional training to the pilots. The publication of a preliminary report is expected in a few days.

Reuters Agency