UPDATE 3-Boeing software re-activated before Ethiopian crash -sources

SEATTLE/PARIS/WASHINGTON, April 3 (Reuters) - Boeing anti-stall software on a doomed Ethiopian Airlines jet re-engaged and pushed the jet downwards after the pilots 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 intentionally re-deployed the MCAS system, which was designed to push the nose of the 737 MAX down to prevent a stall but which is suspected of exacerbating a different scenario linked to two recent crashes. A person with knowledge of the aircraft said the system cannot re-activate itself unless prompted by pilots.

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