National Transportation Safety Board says four bolts meant to hold door plug of 737 Max 9 in place were apparently absent
A cabin panel that blew off a brand-new Boeing 737 Max 9 jet mid-flight appeared to be missing four key bolts, according to an initial report by the US safety regulator.
The bolts meant to hold the door plug in place were absent, the National Transportation Safety Board said. It released photographic evidence alongside the preliminary findings of its investigating on Tuesday.