The FAA said it was closely monitoring Boeing 737 Max targeted inspections and will consider additional action based on any further discovery of loose or missing hardware.

Boeing recommended the inspections after an international operator conducting routine maintenance discovered a bolt with a missing nut on a mechanism in the rudder-control linkage, the FAA said.

‘The issue identified on the particular airplane has been remedied,’ Boeing said.

‘Out of an abundance of caution, we are recommending operators inspect their 737 Max airplanes and inform us of any findings. We informed the FAA and our customers and will continue to keep them aware of the progress.’

Production and delivery of the Max will continue without interruption. The issue does not affect older-model 737 Next Generation planes, Boeing said.

Boeing shares dropped 0.67 percent at the closing bell on Thursday.

United Airlines American Airlines, two major domestic customers of the MAX, each said it did not expect inspections to have an impact on operations.

Southwest Airlines, a U.S. carrier that solely flies the 737 NG and MAX, did not immediately respond to a request for comment.

The FAA said Boeing had issued a message urging operators of newer single-aisle airplanes to inspect specific tie rods that control rudder movement for possible loose hardware. The rudder controls the position of an aircraft’s nose while in flight.

The inspections involve taking off an access panel and validating that the hardware had been properly installed, Boeing said. The process should take two hours, and Boeing is inspecting undelivered 737 MAX aircraft before handing them over to customers.

‘The FAA will remain in contact with Boeing and the airlines while the inspections are under way,’ the agency said, asking airlines to respond if any loose hardware has been detected previously and provide details on how quickly these inspections can be completed.

Any issue involving a rudder that is not working properly would likely be identified in a pre-flight check, as flight crews routinely examine the rudder system before an aircraft pushes back from the gate, Boeing said.

The inspections will help the FAA determine how prevalent the problem is and whether it is a sign of a larger lapse in production quality that requires the regulator to take further action, said Anthony Brickhouse, an air safety expert at Embry-Riddle Aeronautical University.

‘Airlines need to take it seriously,’ he said. ‘But as a member of the flying public, I don’t see this as an issue to be concerned about.’

The 737 Max was grounded for 20 months worldwide after two fatal crashes in 2018 and 2019 killed 346 people in Ethiopia and Indonesia.

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