What was found
RIGHT HORIZONTAL STABILIZER RIB ASSY #4 STIFFENER #2 CRACKED AT LOWER SECTION<[01] PERFORMED HFEC AND CONFIRMED CRACK AT LOWER SECTION OF STIFFENER #2 OF RIB ASSY #4 ; IAW NDTM PART 6;51-00-00 PROCEDURE 23.<BR>[NORTEC 600 ; B/C 172389 ; CALIB.DUE- 3/23];[02] REMOVED DAMAGE AT RIGHT HORIZONTAL STABILIZER RIB ASSY #4 STIFFENER #2 AS PER SRM 51-10-02-0G-0 AND SRM 55-10-09-2R-4.;[03] VERIFIED STEP 2.;[04] PERFORMED HFEC INSP. ON R/HORIZ STAB. RIB ASSY #4 STIFF #2 IAW B737 NDT PART 6 51-00-00 PROC. 23. NO CRACKS IN WEB AREA.EQUIP: NORTEC 600 B/C 166317 CAL DUE: 10/23;[05] PERFORMED ROTO INSP. ON EXISTING HOLES IN REPAIR AREA ON R/HORIZ STAB. RIB ASSY #4 STIFF #2 IAW B737 NDT PART 6 51-00-00 PROC. 16. NO CRACKS; EQUIP: NORTEC 600 B/C 166317 CAL DUE: 10/23; B/C 172543;[06] LOCATED AND DRILLED REPAIR PARTS ON RIGHT HORIZONTAL STABILIZER RIB ASSY #4 STIFFENER #2 AS PER SRM 55-10-09-2R-4.;[07] EVALUATED ROUGHNESS AT REWORKED AREA: ROUGHNESS AT OR SMOOTHER THAN 63 MICROINCHES RA AS PER SRM 55-10-09-2R-4.;[08] (AMENDING TOOL B/C ON STEP 7) EVALUATED ROUGHNESS AT REWORKED AREA: ROUGHNESS AT OR SMOOTHER THAN 63 MICROINCHES RA AS PER SRM 55-10-09-2R-4. TOOL USED: B/C 171854;[09] VERIFIED STEP 6;8.MIXED BMS 5-95 SEALANT AT 21:30; 3/16/23. SQUEEZE OUT TIME BY 17:30; 3/17/23.;[11] INSTALLED REPAIR PARTS ON RIGHT HORIZONTAL STABILIZER RIB ASSY #4 STIFFENER #2 AS PER SRM 55-10-09-2R-4. APPLIED FILET SEAL TO THE REPAIR PARTS REF SRM 55-10-09-2R-4 REPAIR 4 AND 51-20-05;