Flight data recorders from an Ethiopian Airlines plane which crashed in the African country have arrived in France for analysis.
The black boxes arrived as frustrated relatives of the 157 people killed in the crash stormed out of a meeting with airline officials in Addis Ababa.
Sunday’s crash was the second fatal flight for a Boeing 737 Max 8 in less than six months.
More than 40 countries, including the US and Britain, have now grounded the planes or refused to let them into their airspace.
After holding out for several days, the US Federal Aviation Administration issued an emergency order grounding the planes on Wednesday, saying they had new satellite data and evidence that showed the movements of the Ethiopian Airlines plane were similar to those of Lion Air Flight 610.
That flight crashed into the Java Sea off Indonesia in October, killing 189 people.
Officials at Lion Air have said sensors on their plane produced erroneous information on its last four flights, triggering an automatic nose-down command that the pilots were unable to overcome on its final voyage.
Ethiopian Airlines CEO Tewolde Gebremariam said its pilots had received special training on how to deal with that problem.
“In addition to the basic training given for 737 aircraft types, an additional training was given for the Max version,” he said. “After the Lion Air crash, questions were raised, so Boeing sent further instructions that it said pilots should know.”
He said he is confident the investigation will reveal that the crash is not related to the safety record of Ethiopian Airlines, widely seen as the best-managed in Africa.
Firm answers about what caused the crash could take months. The French air accident investigation authority, known by its French acronym BEA, said it will handle the analysis of the flight data recorders retrieved from the crash site.
The BEA has experience with global air crashes, and its expertise is often sought whenever an Airbus plane crashes because the manufacturer is based in France. A BEA official said that the recorders have already arrived in France but gave no timeframe on how long the analysis could take.
In Addis Ababa, about 200 angry family members of crash victims left a briefing with Ethiopian Airlines officials, saying the airline has not given them adequate information.
Officials said they have opened a call-in centre that is open 18 hours a day to respond to questions, but family members said they are not getting the answers they need. People from 35 countries died.
At the crash scene in Hejere, about 31 miles from Addis Ababa, growing numbers of family members have arrived. Blue plastic sheeting covered the wreckage of the plane.
The 737 Max was supposed to boost Boeing’s fortunes for years to come, but instead the groundings will have a far-reaching financial impact on Boeing, at least in the short term, said John Cox, a veteran pilot and CEO of Safety Operating Systems.
In addition to the planes that have been grounded, there are more than 4,600 Boeing 737 Max 8 planes on backlog that are not yet delivered to airlines.
“There are delivery dates that aren’t being met, there’s usage of the aircraft that’s not being met, and all the supply chain things that Boeing so carefully crafted,” Mr Cox said. “If they can’t deliver the airplanes, where do they put the extra engines and the extra fuselage and the extra electrical components?”
Impacted airlines also may come knocking on Boeing’s door claiming damages.
Norwegian Airlines said it would pursue reimbursement from Boeing for lost business and if other carriers follow suit, that could be costly.
The US Federal Aviation Administration was under intense pressure to ground the planes and resisted even after Canada relented on Wednesday and agreed to bar the Max from the air, leaving the US almost alone.
The agency, which prides itself on making data-driven decisions, had maintained there was nothing to show the Boeing jets were unsafe, and flights continued.
But President Donald Trump, who announced the grounding, was briefed that same day on new developments and it was determined the planes should be grounded, the White House said.
Boeing issued a statement saying it supported the FAA’s decision even though it “continues to have full confidence” in the plane’s safety.