What was found
CORROSION WAS DISCOVERED ON NINE WING FUEL ACCESS PANEL DOUBLERS. THE CORRODED LOCATIONS WERE BLENDED OUT AND THE REMAINING THICKNESSES WERE MEASURED USING ULTRASOUND. BLEND MINIMUM REMAINING THICKNESSES. FIGURE 1 IS A SKETCH OF THE DAMAGE LOCATIONS. FIGURES 2 THROUGH 10 CONTAIN PHOTOGRAPHS OF THE DAMAGE WITH NDT GRIDS OF POST-BLEND REMAINING THICKNESS MEASUREMENTS. THE DAMAGE TO THE WING FUEL ACCESS PANEL DOUBLERS IS TO BE REPAIRED BY TRIMMING (511BB), BLENDING TO REMOVE CORROSION, AND RESTORING PROTECTIVE SURFACE FINISHES. REPAIR DOUBLERS WILL BE INSTALLED, WHERE NECESSARY.