An advisory light on the Alaska Airlines plane that lost a piece of its fuselage last week had come on during previous flights, preventing the aircraft from being used on long flights over water, the National Transportation Safety Board said.
A door plug is used to fill a doorway and held together by 12 stop fittings, which prevent the door plug from becoming dislodged. In this case, the plug was not used for a functional door, NTSB Chairperson Jennifer Homendy said.
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