Boeing is urging airlines to inspect all 737 Max airplanes for possible loose or missing parts.
The Federal Aviation Administration on Thursday said inspections involve looking for a possible loose bolt in the rudder control system.
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The FAA said the move stems from incidents on two separate aircraft, one involving a missing nut and the other a loose nut.
The inspection takes about two hours, according to the FAA.
The 737 Max was previously grounded for nearly two years after two fatal crashes that killed 346 people.
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