Importantly, Dagmawit said there were no dissenting voices among participants who worked on the preliminary report, which was sent to the 34 nations with citizens aboard the flight. It also focused on airline maintenance and training.
Earlier on Thursday, the Ethiopian 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. It's unknown what would have kept the pilots of the Lion Air flight from disengaging the system and trimming the aircraft.
Families of the 157 victims, regulators and travellers around the world are waiting for clues to the accident after the new Boeing jet crashed six minutes after take-off.
Ethiopian investigators are focusing most of their attention on recommendations directed at Boeing and regulators.
Boeing has been working on an upgrade of the MCAS software since the Lion Air crash.
- Experts believe a new flight control system, MCAS, on the jets, created to stop stalling by dipping the nose, may have been a factor in both accidents, with pilots unable to override it as their jets plunged after a faulty sensor indicated a stall.
- Boeing maintains its new, fuel-efficient jets are safe, but supported the U.S. Federal Aviation Administration (FAA) decision to ground them.
The FAA said in a statement that it is continuing to work toward a full understanding of what happened and will take appropriate action as findings become available.
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Today's findings could ignite a debate with Boeing about how crew responded to problems triggered by faulty data from an airflow sensor, particularly over whether they steadied the plane before turning key software off.
Most accidents take months of analysis because of the need to trace backwards to find a root cause from tangled evidence.
Investigators looking to uncover the causes must answer one of the biggest questions: Was the plane's software to blame?
Meanwhile, Fanta said: "There was no interference from anyone in the investigation".
Ethiopian Airlines Boeing 737-800 parked at Bole International Airport in Addis Ababa, Ethiopia.
A person with knowledge of the aircraft said the system can not reactivate itself unless prompted by pilots.
"Pilots shouldn't have to cope with such an emergency situation".
Boeing is now developing a software fix for MCAS that it says will add inputs from a second AOA sensor and an indicator light that will alert pilots when something is wrong.