Investigations are underway into the Boeing-made 737 Max 9 that suffered a door plug blowout during an Alaska Airlines flight last month.
The National Transportation Safety Board (NTSB) said in a preliminary report Tuesday that four key bolts were missing.
They’ve traced the missing bolts back to Boeing’s Washington state plant where the plug was removed to make repairs before the jet was delivered to Alaska Airlines. The NTSB has requested process documentation from Boeing and the FAA for potential oversights.
Boeing CEO David Calhou has stated that the company accepts responsibility for what happened regardless of the results of the investigation.
‘There’s no way that this plane should have been delivered with four safety critical bolts missing,” said Jennifer Homendy, the chair of the National Transportation Safety Board.
