What was found
ON PREFLIGHT INSPECTION, THE PILOT NOTICED THERE WAS NO RESISTANCE IN THE RUDDER PEDALS WHEN MOVED FROM LT TO RT, THIS WAS CONFIRMED WHEN THE PILOT MOVED THE RUDDER PEDALS AND ANOTHER PILOT CONFIRMED THERE WAS NO RUDDER MOVEMENT. MX INSPECTED THE RUDDER CONTROL SYS AND FOUND THE LT RUDDER CABLE FRAYED AND BROKEN AT FS 507.00. THE CABLE EXHIBITED WEAR AND FRAYING LOCALIZED TO THE AREA UNDER THE PULLEY AND ENCLOSED IN THE PULLEY MOUNTING BRACKET. FURTHER INVESTIGATION FOUND THE CABLE GUARD PIN INSTALLED IN THE PULLEY BRACKET CORRODED AND WORN. THERE WAS A SMALL AMOUNT OF OXIDATION ON THE CABLE LOCALIZED TO THE PULLEY BRACKET AREA. THE RT RUDDER CABLE WAS INSPECTED AT THE ADJACENT PULLEY AND WAS FOUND TO HAVE SEVERAL BROKEN STRANDS; THE RT RUDDER CABLE WAS ALSO REPLACED.