The National Transportation Safety Board has hit some of Boeing’s planes with “urgent safety recommendations” that flight controls could jam on 737s, including the 737 MAX line.

The agency said that an actuator attached to the rudder on some 737 NG or 737 MAX planes could fail. This warning comes after a February incident in which a United Airlines Boeing plane’s pilots reported their rudder pedals “stuck” in the neutral position.

Boeing has been under intense pressure from lawmakers and the federal government over previous accidents this year, such as an incident in which a door plug flew off and disrupted an Alaskan Airlines flight.

“Boeing’s 737 flight manual instructs pilots confronted with a jammed or restricted rudder to ‘overpower the jammed or restricted system (using) maximum force, including a combined effort of both pilots,’” the NTSB said in a news release.

“The NTSB expressed concern that this amount of force applied during landing or rollout could result in a large input to the rudder pedals and a sudden, large, and undesired rudder deflection that could unintentionally cause loss of control or departure from a runway,” the statement said.

United Airlines is the only airline with the component in its planes, but they have since been replaced.

The Federal Aviation Administration has said it is “monitoring the situation closely” and will “convene a corrective action review board based upon the NTSB’s interim recommendations and determine next steps” on Friday.

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The FAA recently revealed details of its investigation into Boeing, concluding that the company’s manufacturing workers were pressured into producing components with speed over prioritizing quality. In response, the company said it is making improvements to its production process.

“We’ve taken important steps to foster a safety culture that empowers and encourages all employees to share their voice, but it will require continuous focus,” the company said in a statement.