What was found
THE FLIGHT CREW FOR THIS AIRCRAFT DESCRIBED HAVING AN UNEXPLAINABLE DISPLACE OF THE RIGHT RUDDER PEDAL. THEY INDICATED THAT THE PEDAL DISPLACED ABOUT HALF TRAVEL IN FLIGHT. THE CREW WAS ABLE TO TRIM OUT THE YAW MOMENT AND CONTINUE THE FLIGHT. THE CREW BELIEVED THAT THERE WAS AN ISSUE WITH THE AUTO-PILOT SYSTEM AT THE TIME. MAINTENANCE TROUBLESHOT THE PROBLEM AND DISCOVERED THAT A RUDDER BOOST BLEED AIR FITTING HAD BROKEN OFF OF A BLEED AIR TUBE IN THE RIGHT ENGINE COMPARTMENT AND THUS CAUSING A FAILURE OF THE RUDDER BOOST SYSTEM. THE BLEED AIR DUCT WAS REPLACED AND THE AIRCRAFT WAS RETURNED TO SERVICE.