What was found
DURING CLIMB, A VIBRATION WAS FELT THROUGHOUT THE AIRCRAFT. A PRECAUTIONARY LANDING WAS MADE. MAINTENANCE WAS DISPATCHED TO THE AIRCRAFT AND DISCOVERED THEY LEFT INBOARD AILERON BOLT HAD FALLEN OUT OF THE MOUNT HOLE. THE BOLT WAS LOCATED IN THE WING, THE NUT AND WASHER WERE NOT LOCATED. A BOLT, NUT AND WASHER WERE INSTALLED AND PINNED. THE AILERON WAS INSPECTED FOR DAMAGE AND SECURITY AND THE AIRCRAFT RETURNED TO SERVICE.