Crew of crashed Ethiopian Airlines Boeing 737MAX used the prescribed Stabilator Trim Cut-Out switches to stop the MCAS system but it re-engaged.
The crew of Ethiopian Airlines Boeing 737MAX8 which crashed with 157 people on board, used the prescribed Stabilator Trim Cut-Out switches to stop MCAS system according to an article by Wall Street Journal.
The Wall Street article sites information coming from the investigation. By it, we can now reveal how it’s possible the aircraft can crash despite using the Cut-Out switches.
According to Reuters, the MCAS re-engaged as many as four times after the crew initially turned it off due to suspect data from an airflow sensor, two people familiar with the matter said.
It was not immediately clear whether the crew had chosen to re-deploy the system, which pushes the nose of the Boeing 737MAX downwards, but one person with knowledge of the matter said investigators were studying the possibility that the software had kicked in again without human intervention.