What was found
DURING A ROUTINE C-CHECK INSPECTION MAINTENANCE PERFORMED A MAJOR REPAIR ON VERTICAL STABILIZER L/E UPPER SKIN. FOUND CORROSION AT STA ZFS 179.000. REMOVED CORROSION FROM VERTICAL STABILIZER L/E UPPER SKIN STA ZFS 179.000 IAW DC8 SRM 51-1-8 PGS 17, 18. FOUND OUT OF LIMITS IAW DC8 SRM 55-2-1 FIG 3 PGS 15, 16. REMOVED DAMAGED AREA IAW DC8 SRM 55-2-1 FIG 4 PAGE 17. FABRICATED FILLER (AL 7075 T6- 0.050) + DOUBLER (AL 707516 0.050) IAW DC8 SRM 55-2-1 FIG 4 PAGE 17. CLEANED, TREATED AND PRIMED FILLER AND DOUBLER INTERNAL PART IAW DC8 SRM 51-1-8B. INSTALLED FILLER AND DOUBLER IAW DC8 SRM 55-2-1, SRM 51-1-21 PAGE 1, DC8 SRM 51-1-20D PAGE 9, DC8 SRM 51-1-11 PAGE 1.