What was found
DURING HEAVY CHECK, FOUND CORROSION ON HORIZONTAL STABILIZER REAR SPAR UPPER CHORD. THE CORROSION WAS TRIMMED OUT PER SRM AND VERIFIED REMOVED USING HFEC METHOD. FABRICATED A EXTERNAL DOUBLER AND REPAIR FILLER TO FIT SKIN CUTOUT. FABRICATED REPAIR ANGLE AND REPAIR FILLER IAW FIGURE 4A-4G. INSTALLED ALL REPAIR PARTS. VERIFIED 8110-3 APPROVAL RECEIVED AND COMPLETED REPAIR IAW ECO 2513. AIRCRAFT RETURNED TO SERVICE. (M)