A door that blew away from a Boeing 737 Max shortly after take-off may not have been properly secured, a new report says.
The US National Transportation Safety Board has released initial findings from its probe into the incident on an Alaska Airlines plane in January.
It says four key bolts that were meant to lock the unused door to the fuselage appeared to be missing, which have allowed the door panel to move out of position and break away from the aircraft.
The incident happened minutes after Alaska Airlines Flight 2182 took off.
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