What was found
DURING C-CHECK INSPECTION, FOUND CORROSION ON RIGHT UPPER REAR SPAR CAP AFT FLANGE XRS -133 TO -137. CORROSION BLENDOUT EXCEEDED DC9 SRM LIMITS. THE BLENDED AREA WAS TEMPORARILY REPAIRED USING 7075-T6 DOUBLERS, ANGLES AND FILLERS INSTALLED WET WITH SEALANT. REPETITIVE INSPECTION IS REQUIRED ON REPAIR AREA AT 120 FLIGHT HOUR INTERVALS. REPLACEMENT OF SPAR CAP TERMINATES REPAIR AT 2000 FLIGHT HOURS OF 2 YEARS AFTER COMPLETION OF REPAIR. ACCOMPLISHED IAW EVERGREEN INTERNATIONAL AIRLINES, ENGINEERING CHANGE/REPAIR AUTHORIZATION NR 933-57-028-2. (M)