The Federal Aviation Administration said seats on hundreds of Boeing 737 MAX aircraft registered in the United States were installed incorrectly and now need to be fixed. The agency disclosed the problem on Monday, adding a new maintenance issue for one of Boeing's most closely watched jet families.

According to the FAA, the concern is not minor. If the seat installations are not corrected, they could create an injury risk. That makes the issue a safety matter for affected operators and puts attention on inspections and repairs for the planes involved.

The announcement applies to Boeing 737 MAX jets on the U.S. registry, with the FAA indicating that hundreds of aircraft are affected. Based on the agency's notice, airlines and operators with impacted planes will need to address the seat problem to bring the aircraft into compliance.

The development adds another regulatory issue around the 737 MAX, though this notice is specifically focused on seat installation. For travelers and the aviation industry, the immediate takeaway is that the FAA has identified a fixable problem and wants it corrected on the affected jets.