Many Boeing 737 Max 8s grounded after Ethiopian crash

What brought an Ethiopian Airlines flight down just minutes after takeoff on Sunday, killing all 157 aboard, has not been determined. But while the investigation proceeds, at least 22 carriers have taken the Boeing model involved out of service, including all those operating in China and Indonesia.

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The accident was the second in recent months involving Boeing’s new 737 Max 8. In October, a Lion Air flight crashed into the Java Sea shortly after takeoff. Aviation authorities have been looking into the possibility that incorrect data might have activated new anti-stall software that kept pushing the nose downward — and that pilots may not have been made fully aware of.

On the ground: The plane’s flight data recorder and cockpit voice recorder have been recovered, Ethiopian Airlines said. The pilot sent out a distress call and was cleared to return to the airport shortly before the crash.