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Investigation shows four bolts were completely missing from the Boeing 737 Max door plug that exploded.

The National Transportation Safety Board’s report describes the defect that prompted immediate aircraft groundings as the FAA scrambled to investigate a nightmarish January 5th Alaska Airlines flight.

As reported by CNBC, it says “four bolts that prevent upward movement of the MED plug were missing before the MED plug moved upward off the stop pads.”