WHILE FLARING TO LAND, THE RUDDER CABLE FOR THE LEFT RUDDER SEVERED DUE TO IMPROPER ROUTING DURING THE SCHEDULED REPLACEMENT OF THE CONTROL CABLES IN COMPLIANCE WITH AN AIRWORTHINESS DIRECTIVE. THE FLIGHT CREW REPORTED HEARING A POPPING SOUND FOLLOWED BY THE RUDDER PEDAL DEFLECTING TO THE STOP. CONTROL WAS MAINTAINED AND A NORMAL LANDING COMPLETED.