According to CCTV news, the Wall Street Journal reported on January 29th local time that the emergency hatch of a Boeing aircraft that had an accident with Alaska Airlines on January 5th may have been missing fixing bolts when it left the factory.
According to reports, Boeing insiders believe that workers on the company's production line may not have reinstalled the bolts when opening or removing the emergency hatch of the aircraft before reinstalling it. Because there are no relevant markings for bolt installation on the involved cabin door of the aircraft. Insiders also pointed out that there were omissions in the paperwork and processes related to the cabin doors at Boeing's Renton factory in Washington state. The National Transportation Safety Board of the United States is expected to release the latest progress of its investigation this week.
In addition, Boeing applied to the Federal Aviation Administration last year for a safety standard exemption for the 737 MAX 7 model awaiting certification, so that it can be put into use before making necessary design changes. However, Boeing confirmed on the 29th that it has withdrawn this application.