What was found
RIGHT HORIZONTAL STABILIZER INSPAR RIB ASSY. #4 (STAB STA 120.30); STIFFENER #3 LOWER AREA CRACK NOTED. REMOVED CRACK IAW SRM 55-10-09-2R REPAIR 4. PERFORMED HFEC INSP ON REWORKED AREA WEB IAW B737 NDT P6 51-00-00 PROC.23 CRACK NOTED. PERFORMED ROTO INSP ON REWORKED AREA 4EA EXISTING HOLES AT LOWER CHORD IAW NDT P6 51-00-00 PROC.16, CRACK NOTED ON 1EA HOLE. FABRICATED NEW ANGLE AT #4 RIB STIFFENERS #3 IAW SRM 55-10-09-2R REPAIR 5. LOCATED AND DRILLED REPAIR IAW SRM 51-40-05-0G-0. FABRICATED FILLER IAW SRM 55-10-09-2R-REPAIR 5.TREATED AND PRIMED NEW REPAIR ANGLE IAW AMM 51-21-41-370-801 & AMM 51-21-72-370-804. INSTALLED REPAIR IAW SRM 51-40-02-0G-0 AND SRM 55-10-09-2R-5 REPAIR 5.