Boeing 737 Max 9 Jet Missing Key Bolts Before Door Plug Blowout

A lawsuit reveals passengers heard a 'whistling sound' on a previous flight, raising concerns about Boeing's manufacturing quality.

A lawsuit alleges passengers on a previous flight of the same Boeing 737 Max 9 jet heard a 'whistling sound' coming from the door plug area.
The National Transportation Safety Board found the jet was missing key bolts intended to secure the door plug, which blew out during a flight last month.
No serious injuries were reported when the door plug blew out, but the incident has raised concerns about manufacturing quality at Boeing.
The Federal Aviation Administration grounded most Max 9s for three weeks for door plug inspections, following the incident.
The incident adds to ongoing questions about Boeing's manufacturing quality, following the deadly crashes of two Max 8 jets in 2018 and 2019.