08:21 AM EDT, 10/01/2024 (MT Newswires) -- (Updates with Boeing's ( BA ) response in the last paragraph.)

Boeing's ( BA ) issue with faulty rudder pedals that pose safety risks may still be found in 737 airplanes at more than 40 foreign carriers, the US National Transportation Safety Board said Monday in a letter to the Federal Aviation Administration.

The NTSB posted urgent safety recommendations last week, pertaining to over 353 faulty actuators installed in Boeing 737 planes, following an incident involving a United Airlines (UAL) flight where the actuators caused the plane's rudder control system to jam.

The safety board said Monday that it learned two foreign operators suffered similar incidents in 2019. "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 the letter.

About 16 affected actuators may still be installed on US-registered aircraft and up to 75 have been sent for aftermarket installation, the NTSB said.

A Boeing ( BA ) spokesperson said, "We don't have a comment and defer to the NTSB on the investigation."

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