What was found
L/H HORIZONTAL STABILIZER AFT SPAR UPPER CHORD WAS FOUND TO HAVE CORROSION FROM STAB STA 169 TO 175 WITH DAMAGE MEASURES APPROXIMATELY 5.75"L X 0.75"L WITH A REMAINING THICKNESS OF 0.399". THE CORROSION DAMAGE HAS BEEN BLENDED OUT WITH THE FINAL BLEND OUT DIMENSIONS OF 5.75"L X .75"L X 0.399" MINIMUM REMAINING THICKNESS ON THE UPPER CHORD CENTER FACE. BLENDED DAMAGE TO THE UPPER CHORD AFT FLANGE ARE AS FOLLOWS 3.25"L X 1.0"W X 0.109" MINIMUM THICKNESS REMAINING. THIS REPAIR HAS FOUND TO BE STRUCTURALLY AND FUNCTIONALLY ACCEPTABLE. REF. STS EA 45-2020-026 REV A DTD 3/11/2020.