What was found
EO4453A332, RS NR: R-53-00-36599: WHEN ACCOMPLISHING A MOD ON THE SUBJECT ACFT IAW REF E, REF C FOUND SEVERAL SEM FASTENER HOLES AS SHOWN IN FIG 1. THE MINIMUM EM IS FOUND TO BE 1.38D. FABRICATE NEW -1 WEB IDENTICAL TO EXISTING WEB 1456U1321-7 FROM 0.032" THICK 2024-T3 ALUMINUM SHEET. BACK DRILL FASTENER HOLES COMMON TO NEW EXTENDED WEB. REMOVE AND DISCARD EXISTING INTERCOSTAL. LOCALLY FABRICATE A NEW -2 INTERCOSTAL. INSTALL NEW FABRICATED 146U1321-7 WEB. APPLY ALODINE AND 2 COATS OF BMS 10-11 TYPE 1 PRIMER. FABRICATE 2 FILLERS FRM 0.032" GAGE 2024-T3 AND 0.040" GAGE 2024-T3 CLAD SHEET. REPLACE EXISTING FASTENER. INSTALL NEW FABRICATED (-2) INTERCOSTAL 146U8009. SHIM TO A MAXIMUM GAP OF 0.005 INCHES. TREAT ALL FABRICATED PARTS AND INSTALL ALL PARTS AND CONTINUE OTHERWISE IAW DWG 624U0062 REQUIREMENTS. RS NR: R-53-00-36599.