The National Transportation Safety Board chairwoman says heroic actions by the crew aboard an Alaska Airlines flight ensured everyone survived last year when the door plug panel blew out of the plane.

Boeing will be back in the hot seat Tuesday as the National Transportation Safety Board holds a hearing to present its findings from an investigation into the terrifying incident in which a door plug blew out of an Alaska Airlines 737 Max.

Investigators concluded that the door panel on the newly manufactured Boeing 737 Max 9 had been removed to repair rivets on the frame of the plug. When Boeing personnel replaced t