What was found
STABILIZER TORQUE TUBE HOLES FOR STABILIZER MOUNT WERE FOUND ELONGATED. THIS WAS DISCOVERED WHILE INSPECTING THE LEFT STABILIZER FOR A CREAKING NOISE THAT WAS DISCOVERED DURING PRE-FLIGHT. THE ELONGATION OF THE HOLES ALLOWED MOVEMENT OF THE STABILIZER. THIS ACTION WORE THE ATTACHMENT BOLTS FOR THE OUTBOARD MOUNT FITTING P/N 16809-003 RESULTING IN MOVEMENT OF THE FITTING AGAINST THE SPAR. SUBMITTER SUGGESTED INSPECTION OF THE HOLES FOR WEAR AT 500 OR 1,000 HOUR INTERVALS. RELATED AD 74-13-03.