What was found
CORROSION AND TOOL MARKS WERE FOUND ON INNER HOLE #27 AND WEAR ON UPPER SKIN AROUND FROM #27 AT RH HORIZONTAL STAB. SUMMARY OF NRC 00735: CORROSION LEVEL 2. CORROSION IN HOLE #27 AT RH HORIZONTAL STAB WAS REPAIRED PER PRI 622779-14 REV 2 & ER/A 622779-14 REV ORIGINAL. REPAIR APPROVAL IS LIMITED TO 24 MONTHS FROM 24DEC24. ADDITIONAL ENGINEERING AUTHORIZATION (ER/A REVISION) IS REQUIERED FOR CONTINUED SERVICE BEYOND THIS LIMIT. NOTE TO ENGINEER: DAMAGE TOLERANCE EVALUATION IS REQUIERED IN ACCORDANCE WITH PROCEDURES ESTABLISHED IN FAA AC 120-93. (REFRENCE LOG PAGE 0748181). ASSOCIATED ER/A 14-622779 ADDED FOR AC 9544. (LP #0753609)