In its notice, the FAA tells airlines to alert crews of the potential issue.

The NTSB criticized the FAA for a desultory response to the risk from faulty 737 rudders and Boeing for not fully informing airlines in advance about them.

The Federal Aviation Administration on Tuesday issued a safety alert to airlines warning of the potential for limited or jammed rudder movement on certain Boeing 737 airplanes. Last week, the National Transportation Safety Board said more than 40 foreign operators of Boeing 737 airplanes may be using MAX or 737 Next Generation planes with rudder components that could pose safety risks.

The US Federal Aviation Administration warned operators of certain Boeing Co. 737 aircraft that the rudder system could possibly jam due to a faulty part, a week after a safety official rebuked the agency for not acting sooner to address the issue.