What was found
DURING MX, CORROSION INSPECTION, FOUND CORROSION ON LT WING OTBD SIDE OF NR 1 NACELLE INBD T/E BETWEEN WS 160 & 175. MX REMOVED LT WING UPPER SKIN DOUBLERS AT WS 160 AT APPROX 7.5" FROM L/E SPAR AND APPROX 7.5" FROM THE REAR EDGE SPAR. ON REMOVAL AND FURTHER INSPECTION OF WING BAY AREA, FOUND CORROSION ON INTERNAL WING SUPPORT U CHANNELS, TEE SUPPORT FITTINGS AND SUPPORT BRACKETS. FABRICATED WING SKIN DOUBLERS IAW SD3-30 SRM 57-09-5, FIG 1. FABRICATED SUPPORT U CHANNELS IAW SRM 57-09-5, FIG 1. REMOVED THE INTERNAL SUPPORT LT BRACKETS AT WS 160. FABRICATED SUPPORT L BRACKETS AT WS 160. FABRICATED SUPPORT LT BRACKETS IAW SRM 51-30-00. REMOVED BUTT STRAP AT WS 160 FROM LEADING EDGE SPAR TO T/E SPAR, FABRICATED BUTT STRAP IAW SRM 51-30-00 AND SHORTS DWG SD360-578-11C. REMOVED BUTT STRAP FILLERS AT WS160. FABRICATED BUTT STRAP FILLERS IAW SRM 51-30-00. ALL MATERIAL FABRICATED WERE CLEANED, TREATED AND PRIMED AND PAINTED IAW SRM 51-23-00. INSTALLED FASTENERS AND WING SKIN DOUBLERS AND BUTT STRAP ON LT WING UPPER SURFACE AT WS 160 IAW DWG SD3-30-6535 / SD360-57-11/C.