What was found
CORROSION ALONG LT WING UPPER SPAR CAP SURFACES. PERFORMED A FLUORESCENT DYE PENETRANT INSPECTION OF THE BLENDED AREAS ON LEFT WING UPPER SPAR CAP, FOR REMAINING CORROSION & CRACKS IAW NTM PART 7 20-00-00. NO REMAINING CORROSION OR CRACKS NOTED AT THIS TIME. PERFORMED AN ULTRASONIC THICKNESS INSPECTION IAW NTM PART 4 20-00-01. MAPPED REMAINING THICKNESS ON SPAR CAP. SEE SUB SQUAWK ONE OF THIS SQUAWK FOR EVALUATION OF NDT DETAILS. R & R ALL FASTENERS THAT WERE AFFECTED DURING BLENDING FOR CORROSION REMOVAL. ALL WORK PERFORMED & COMPLETED IAW FIELD REPAIR S-560-0792 03RD REV DATED 05 04 2016. APPROVED BY 8100-9 DATED 5 6 16. THIS REPAIR TO BE CONSIDERED MAJOR.