(NEWSnet/AP) — Boeing is asking airlines to inspect its 737 Max jets for a potential loose bolt in the rudder control system, the airplane-maker and Federal Aviation Administration confirmed this week.

FAA said it will monitor the inspections closely.

Boeing issued inspection guidance to airlines after an international operator found a bolt with a missing nut, during routine maintenance. In a separate case, Boeing also found an undelivered aircraft that had a nut that was not properly tightened.

“The issue identified on the particular airplane has been remedied,” the company told The Associated Press on Friday. “Out of an abundance of caution, we are recommending operators inspect their 737 Max airplanes and inform us of any findings.”

Boeing said it will continue to update both customers and federal regulators regarding progress.

FAA said it will remain in contact with Boeing and affected airlines as inspections are performed, and potentially “consider additional action based on any further discovery of loose or missing hardware.”

According to Boeing, there have been no in-flight incidents caused by this condition to date — noting that crews’ routine checks would signal if the rudder was not working properly before an aircraft pushes back from the gate.

All airplanes Boeing is set to deliver onward will have the inspection prior to delivery.

U.S. carriers with 737 Max jets in their fleet include United Airlines, Southwest Airlines, American Airlines and Alaska Airlines. All four of those carriers told The Associated Press they don’t expect operational impacts.

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