Washington — Boeing CEO Dennis Muilenburg was pressed by US lawmakers at a hearing on Tuesday over what the company knew about its MCAS stall-prevention system linked to two deadly crashes that killed 346 people, and about delays in turning over internal 2016 messages that described erratic behaviour of the software in a simulator.

Muilenburg acknowledged errors in failing to give pilots more information on MCAS before the crashes in Ethiopia and Indonesia, as well as for failing to tell the Federal Aviation Administration (FAA) for months that it made an alarm alerting pilots to a mismatch of flight data optional on the 737 Max...

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