Alaska Airlines: Missing Bolts Caused Mid-Air Door Blowout On Alaska Airlines Boeing 737 Max 9: NTSB Report
The National Transportation Safety Board said Tuesday a preliminary report on the Jan. 5 incident that the lack of certain damage on the plane indicates that all four bolts were missing before the plane took off from Portland, Oregon. Without the bolts, nothing prevented the panel from sliding upward and detaching from “stop pads” that secured it to the airframe., World News, Times Now
Source: timesnownews.com