What was found
TWO CRACKS POSSIBLE LT LWR HORIZ STAB SKIN AT APPROX L/E STA 161.04. 23.5" & 30.5"AFT OF FRONT SPAR. GROUNDED - YES. ACCOMPLISHED HFEC ON LT HORIZ STAB LOWER SKIN AT APPROX L/E STA 161.04 23.5" AND 30.5" AFT OF FRONT SPAR, VERIFIED CRACK INDICATION AT BOTH LOCATIONS REF NDT MANUAL PART 6 51-00-00 PROCEDURE 23. APPLIED PAINT STRIPPER REF AMM 51-21-11. REMOVED LT STAB L/E. REMOVED STRIPPER AND PAINT AT CRACK LOCATIONS. MARKED END OF CRACKS WITH DRILL START. REMOVED RIVETS AT RIB FOR REPAIR DOUBLER REF SRM 55-10-01-2R-11 REPAIR 11. CUT OUT DAMAGED SKIN AREAS AND INSTALLED EXTERNAL DOUBLER ON LT HORIZ STAB LOWER INSPAR SKIN PER SRM 55-10-01-2R-11 REPAIR 11.