United Airlines is finding loose fitting mounting bolts for the mid aft plug door 737-9 : r/boeing

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United says it found loose bolts on grounded Boeing 737 Max 9 planes: Travel Weekly

Alaska Airlines 737-900 MAX loses a door in-flight out of PDX - Page 22 - PPRuNe Forums

Alaska, United find loose hardware during inspection of 737 MAX 9s

Here's The Difference Between 'Plug Doors' And 'Door Plugs' And How Both Keep You From Blowing Out Of A Plane - The Autopian

United Airlines says they are finding loose bolts on door plugs of Boeing 737 Max 9 planes

Here's The Difference Between 'Plug Doors' And 'Door Plugs' And How Both Keep You From Blowing Out Of A Plane - The Autopian

Alaska Airlines 737-900 MAX loses a door in-flight out of PDX - Page 74 - PPRuNe Forums

US FAA mandates Boeing 737 MAX rudder loose bolt inspections

Unplanned removal, installation inspection procedure at Boeing - Leeham News and Analysis

Loose bolts found on door plugs of grounded United Airlines Boeing 737 Max 9 planes