The US Federal Aviation Administration, or FAA, warned that certain Boeing (BA) 737 MAX airplanes registered in the US may need detailed inspections of its passenger seat assemblies, according to a Monday statement.

The FAA proposed a new airworthiness directive to inspect the jets' seat track fittings and ensure that passenger seats are properly installed. The proposed directive would affect 453 units of Boeing 737-8, 737-9 and 737-8200 jets, the regulator said.

The directive was proposed in response to a report that planes' passenger seats assemblies were not installed in seat tracks and the FAA said it would accept comments on the directive through Sept. 10.