United Airlines has found loose bolts on some plugged doors of its grounded 737 Maxes, threatening to widen Boeing’s problems as it expands public scrutiny beyond the single plane that suffered a mid-air blowout on Friday.
The Chicago carrier said on Monday that inspections of its 737 Max 9s, a variant of the single-aisle jet that contains more seats than the more popular Max 8, “found instances that appear to relate to installation issues in the door plug — for example, bolts that needed additional tightening”.
The airline said its technical operations team would fix the problem “to safely return the aircraft to service”.
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