The National Transportation Safety Board (NTSB) has issued a series of urgent safety warnings concerning the Boeing 737 aircraft, particularly the MAX variant, highlighting critical issues with the rudder control systems. The agency warns that some rudder systems may experience jamming, particularly under cold conditions, posing significant risks during flight operations. Safety officials from the U.S. are calling for immediate action from Boeing and the Federal Aviation Administration (FAA) to address these defects. Following a recent incident in Newark, the NTSB has emphasized that safety checks are necessary for affected Boeing 737 models to prevent potential rudder failures and ensure pilot control during operations.