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9/8/98 AC 43.13-1B FIGURE 3-3. Typical stepped joint repair. c. Use replacement core stock of the same material and density as the original (or an acceptable substitute) and cut it to fit snugly in the trimmed hole. Observe the direction of the original core. When all of the pieces of re placement facing laminations are cut and soaked in resin, coat all surfaces of the hole and the scarfed area with resin. Then coat all surfaces of the core replacement with resin and insert it into the hole. After all of the pieces of resin-impregnated glass-fabric facing are in place and lined up with the original fi ber-orientation, cover the entire area with a piece of peel ply and carefully work down the layers of fabric to remove any air bubbles and excess resin. Apply light pressure by means of sand bags or a vacuum bag. When the resin has cured, sand the repair to match the original contour and refinish the surface. 3-3. REPAIRING HOLES. a. Scarf Method. If the damaged area is less than 3 inches in diameter, the damage may be removed by either sanding with a power sander or hand sanding with 180-grit sandpaper. (1) Scarf back the edges of the hole about 50 times the thickness of the face ply. Thoroughly clean out all of the sanding residue with a cloth wet with an acceptable cleanser. (2) Prepare the patches by (see fig ure3-4) laying the proper weight fiberglass cloth impregnated with resin on a piece of peel ply. A weight of resin equal to the weight of the patch provides a 50-percent ratio. FIGURE 3-4. Preparing the fiberglass sandwich. Par 3-2 Page 3-3PDF Image | AFS-640
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