What was found
LEFT HORIZONTAL STAB LOWER SKIN CRACKED AT STATION 147.9 & 17" FWD OF REAR SPAR. 1" CRACK MARKED IN BLACK MARKER CONFIRMED WITH HFEC IAW NDT 737 PART 6,51-00-00-23. CUT OUT DAMAGE. FABRICATED & INSTALLED REPAIR DOUBLER IAW ECRA 5510-02524. INITIATED DIP TO PERFORM A DETAIL VISUAL & LFEC INSPECTION 56,000 FLIGHT CYCLES AFTER INSTALLATION & AT INTERVALS OF 9,000 FLIGHT CYCLES THEREAFTER IAW SRM 55-10-01 REPAIR 11 TABLE 204. QC IAW ECRA 5510-02524 LT HORIZONTAL LOWER SKIN REPAIR SRM 55-10-01 REPAIR 11 TABLE 203.