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United has already found at least five planes with loose door plug bolts as it begins inspecting its Boeing 737 Max 9 fleet.

United Airlines has found loose door plug bolts on at least five of the Boeing 737 Max 9 planes, as airlines begin inspecting planes following the Federal Aviation Administration's temporary grounding order.

The loose bolts were found during initial inspections of what is known as the "mid-cabin door plug" partway down the fuselage of the 737-9, according to maintenance logs viewed by Skift.

“LH Mid Cabin Emergency Exit Door Plug, Upper Forward Guide Fitting, Lower Attach Bolts (2 ea.) are loose,” re