What was found
RBL21 INTERCOSTAL CORRODED AT BS 767+5-+7. REMOVED CORROSION INTERCOSTAL WEB IAW SRM 51-10-02-0G-0. ACCOMPLISHED UT INSPECTION LOWEST THICKNESS IS .042 IAW 737 NDTM PART 4; 51-00-00 PROCEDURE 2. THE INTERCOSTAL IS OUT OF LIMITS. IAW SRM 53-60-15-1A-1, ALLOWABLE DAMAGE 1, STEP 4.C.2(B). LOCATED AND DRILLED NEW INTERCOSTAL IAW SRM 51-40-05-0G-0 AND DWG 146A0081. INSTALLED NEW INTERCOSTAL IAW SRM 51-40-02-0G-0, AND DWG 146A0081.