What was found
WO 104124 NR00018: SUSPECTED CRACK ON R/H HORIZONTAL STAB. LOWER SKIN AT STAB STA 120.3 RIB 9" AFT OF FORWARD SPAR. VERIFIED WITH HFEC - - PERFORMED HFEC SURFACE INSPECTION OF SUSPECTED CRACK AT RH LOWER HORIZONTAL SKIN STA. 120.3 RIB 9" AFT OF FWD. SPAR REF. 737 NDT PART 6 51-00-00, PROC. 23. FOUND CRACK INDICATION. REMOVED EXISTING FASTENERSIN REPAIR AREA , CUT OUT DAMAGED AREA IN ACORDENANCE WITH SRM 55-10-01-2R-11 REPAIR 11. REQUIRES HFEC PER SRM 55-10-01-2R-11 STEP 4D1. ALL WORK PERFORMED BY AVIATION FUEL SYSTEMS REPAIR, INC. IN WO 2600R800 PERFORMED HFEC INSPECTION OF CUTOUT. NO CRACKS NOTED. REF. B737 NDT MANUAL PART 6 51-00-00 PROCEDURE 23. PERFORMED HFEC OPEN HOLE INSPECTION OF REMOVED FASTENER HOLES. NO CRACKS NOTED. REF. B737 NDT MANUAL PART 6 51-00-00 PROCEDURE 16. RII OF REPAIR COMPLETE. THIS IS A CAT B REPAIR AND WILL REQUIRE AN MTI REF. SRM 55-10-01-2R-11 TABLE 204.