The National Transportation Safety Board (NTSB) issued urgent safety recommendations to Boeing and the Federal Aviation Administration (FAA) after discovering a defect in the rudder control systems of some Boeing 737 NG and 737 MAX airplanes. This follows a February incident where a United Airlines 737 MAX 8 experienced 'stuck' rudder pedals during landing at Newark Liberty International Airport, forcing the pilot to use the nosewheel steering tiller. Tests revealed that the rudder control components, manufactured by Collins Aerospace, were compromised due to improper assembly, leading to moisture accumulation that can freeze and jam the system. The NTSB has called for Boeing to develop new pilot instructions and for the FAA to consider removing the faulty parts from service. United Airlines, the only U.S. carrier affected, has already replaced the faulty components in its fleet. The FAA will convene a corrective action review board to determine further steps.