Bolts needed to secure part of an Alaska Airlines jet that blew off in midair appear to have been missing when the plane left Boeing’s BA 1.60%increase; green up pointing triangle factory.

Boeing and other industry officials increasingly believe the plane maker’s employees failed to put back the bolts when they reinstalled a 737 MAX 9 plug door after opening or removing it during production, according to people familiar with the matter.

The increasingly likely scenario, according to some of these people, is based partly on an apparent absence of markings on the Alaska door plug itself that would suggest bolts were in place when it blew off the jet around 16,000 feet over Oregon on Jan. 5.

They also pointed to paperwork and process lapses at Boeing’s Renton, Wash., factory related to the company’s work on the plug door.

Excerpt from WSJ
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