It was, he said, "apparent" that in both the Ethiopia and Indonesia flights, the software for the anti-stall system - or MCAS - was "activated in response to erroneous angle of attack information".
Boeing CEO Kevin McAllister responded to the report on Thursday, saying that the company would "take any and all additional steps necessary to enhance the safety of our aircraft". All his 207 hours on a Boeing 737 were achieved within the last three months prior the crash.
"As pilots have told us, erroneous activation of the MCAS function can add to what is already a high workload environment".
A day earlier, the nation's transport minister called on Boeing to review the 737 Max flight-control system before allowing planes to be used, after a preliminary government report showing the doomed jetliner couldn't recover from an uncommanded and persistent nose dive shortly after takeoff. "This is what we do at Boeing", he said.
The planemaker said on Monday a proposed software enhancement package to MCAS would be submitted in the "coming weeks", having previously said it would deliver the fix for USA approval by last week.
The pilots followed Boeing-specified procedures, but weren't able to regain control of the plane after the malfunction. Eventually the Ethiopian Airlines pilots couldn't keep the plane from crashing into the ground, killing all 157 people on board.
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Barr has pledged to share a redacted copy of the almost 400-page report with Congress and the public by mid-April. A House committee plans to vote Wednesday on whether to authorize subpoenas for special counsel Robert S.
Amid the unfolding investigations into two deadly crashes and into the greenlighting of a faulty flight system by the FAA, Boeing continues to "be driven by our enduring values, with a focus on safety, integrity and quality in all we do", the company has assured the public. Now, the manufacturer says it is nearing the completion, expecting certification and the update implementation on global 737 MAX fleet "in the weeks ahead". "As part of this effort, we're making progress on the 737 Max software update that will prevent accidents like these from ever happening again".
"Those planes should never fly again", said Nader, speaking by phone at a news conference after Stumo's family filed a lawsuit against Chicago-based Boeing, one of its suppliers and Ethiopian Airlines.
The preliminary AIB report is available in full here.
A Boeing 737 MAX 8 airplane is seen being built in Renton, Washington last month.
The report said that pilot-side sensor readings connected to the computer system varied wildly and affected everything from their understanding of the plane's pitch to its airspeed.
At the same time, the autopilot disconnected as it couldn't handle the mismatch in information it was receiving, and the crew reported to Air Traffic Control that they were experiencing flight control problems.
The manufacturer's statement comes after the USA daily "Washington Post" reported that the United States aviation regulator FAA had made the correction of the second problem another precondition for the aircraft to be allowed to fly again.