NTSB hearing digs into Boeing’s manufacturing processes to investigate door plug blowout

A door plug, used to seal off unused emergency exits, blew off an Alaska Airlines flight over Portland in January because it was missing key anchoring bolts.

PORTLAND, Ore. — The heat is on Boeing as the company takes center stage in two days of hearings surrounding the investigation into the door plug blowout on a relatively new 737 MAX 9 aircraft in January. In one of the most significant new details to come out of the first day of hearings on Tuesday, Boeing said it’s redesigning its door plugs to make them more failure-proof.

The National Transportation Safety Board’s investigation is still in progress, but

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