The U.S. National Transportation Safety Board has said more than 40 foreign operators of Boeing 737 airplanes may be using planes with rudder components that could pose safety risks, though it did not identify which airlines could be affected.

The National Transportation Safety Board said more than 40 companies and airlines using Boeing aircraft of potential safety risks.

The U.S. National Transportation Safety Board on Monday said more than 40 foreign operators of Boeing 737 airplanes may be flying aircraft with rudder components that could pose safety risks.

The US National Transportation Safety Board says more than 40 foreign operators of Boeing 737 aeroplanes may be using planes with rudder components that may pose safety risks. The board last week issued urgent safety recommendations about the potential for a jammed rudder control system on some Boeing 737 aeroplanes after a February incident involving a United Airlines flight.

The U.S. NTSB said more than 40 foreign operators of Boeing 737 airplanes may be using planes with potentially faulty rudder control systems.

The National Transportation Safety Board warned over 40 foreign airlines on Tuesday that their Boeing 737 planes may be fitted with potentially dangerous rudder components. The agency identified 271 parts that could fail and jam the rudder control system.