What was found
L/H HORIZONTAL STABILIZER RIB #4 AFT UPPER SURFACE CRACKED. L/H HORIONTAL STABILIER RIB #4 FWD UPPER SURFACE CRACKED. / [01] TRIMMED DAMAGED AREA AT AFT UPPER SURFACE PER REFERENCE SRM 51-10-02-0G-0.;[02] CORRECTION TO STEP 1; TRIMMED DAMAGED AREA AT FWD UPPER SURFACE PER REFERENCE SRM 51-10-02-0G-0.;[03] VERIFIED STEP 2.;[04] PERFORMED HFEC INSP ON CUT OUT AREA IAW B737 NDT P6 51-00-00 PROC.23; NO CRACKS<BR>TOOL USED : NORTEC 600 B/C 172389 CALDUE: 03/23;[05] PERFORMED ROTO INSP ON EXISTING HOLES IAW B737 NDT P6 51-00-00 PROC.16; NO CRACKS<BR>TOOL USED : NORTEC 600 B/C 166317 CALDUE: 10/22;[06] PERFORMED ROTO INSP ON EXISTING HOLES IAW B737 NDT P6 51-00-00 PROC.16; NO CRACKS<BR>TOOL USED : NORTEC 600 B/C 166317 CALDUE: 10/22;[07] PERFORMED ROTO INSP ON EXISTING HOLES <BR>LOCATED AT L/H HORIZ STAB RIB#4 SKIN REPAIR AREA<BR> IAW B737 NDT P6 51-00-00 PROC.16; NO CRACKS<BR>TOOL USED : NORTEC 600 B/C 166317 CALDUE: 10/22;[08] PERFORMED COUNTERSINK INSP ON EXISTING COUNTERSUNK HOLES<BR>LOCATED AT L/H HORIZ STAB RIB#4 SKIN REPAIR AREA<BR> IAW B737 NDT P6 53-30-00 PROC.3; NO CRACKS<BR>TOOL USED : NORTEC 600 B/C 166317 CALDUE: 10/22;[09] PERFORMED DVI INSP. ON REPAIR ON L/H HORZ. STAB.<BR>ON RIB #4 FWD UPPER SURFACES;[10] DUE TO MANY DAMAGE ON RIB # 4; RIB NEED TO BE REPLACE; ORDERED NEW RIB P/N 182A5304-3; NEW RIB INSTALLED ON CUSTOMER BAR CODE TTG8Q00EELDP;[11] VERIFIED 10