WASHINGTON, Sept 30 (Reuters) - The U.S. National

Transportation Safety Board on Monday said more than 40 foreign

operators of Boeing 737 airplanes may be using planes with

rudder components that may pose safety risks.

The NTSB last week issued urgent safety recommendations

about the potential for a jammed rudder control system on some

Boeing 737 airplanes after a February incident involving

a United Airlines flight.

The NTSB also disclosed Monday that it has learned two

foreign operators suffered similar incidents in 2019 involving

rollout guidance actuators. "We are concerned of the possibility

that other airlines are unaware of the presence of these

actuators on their 737 airplanes," NTSB Chair Jennifer Homendy

said Monday in a letter to FAA Administrator Mike Whitaker.