Boeing 737 MAX Missing Critical Bolts in Alaska Airlines Blowout, NTSB Says.

A preliminary report from the National Transportation Safety Board (NTSB) has revealed that four critical bolts were missing from an Alaska Airlines Boeing 737 MAX 9 jet's plug door before a blowout incident on January 5. The report suggests that the bolts were likely left off by Boeing employees during production. This incident has raised concerns about Boeing's quality controls and oversight of suppliers. The FAA has stated that most grounded 737 MAX 9 jets have undergone inspections and resumed flying. Boeing CEO David Calhoun has acknowledged the company's accountability and stated that they are implementing a quality-improvement plan. The NTSB investigation will focus on determining the manufacturing documents used for the plug door and will interview employees at Boeing and the supplier, Spirit AeroSystems. [Extracted from the article]