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AC 43.13-1B 9/8/98 (3) Make a sandwich by laying a second layer of peel ply over the patch before cutting it to the required size and shape. Sandwiching will prevent the patch from raveling when cut. Brush a good coat of resin over the scarfed area. Remove one piece of peel ply from the first patch and lay the patch in place. Work all of the air out of the resin and remove the top peel ply. Cut the next larger patch so it will overlap the first patch by at least one-half inch. Remove one piece of peel ply from this patch and center the patch over the first one. Work all of the air out of the resin. Continue laying in patches, each overlapping the one below it by at least one-half inch, until you have the re quired number of layers (see figures 3-5 and 3-6) plus an extra ply to restore original strength to the repaired area. FIGURE 3-5. Scarfed repair to a nonstructural laminated fiberglass component. FIGURE 3-6. Symmetrical layup same as original num ber of plies, plus one extra ply. (4) Cover the entire repair with peel ply and carefully work out all of the air bubbles from the resin. Apply pressure over the repair with tape or sandbags and allow it to cure. After the repair has cured, remove the excess resin by filing or sanding the surface to the contour of the original part. Smooth the sur face with fine sandpaper and refinish it to match the original part. (5) An alternate layup method that works equally well is to place the larger patch over the scarfed area first, and then each sub sequent smaller patch over this. Both types of repair are finished in exactly the same way. (6) The scarfed joint method (see fig ure 3-7) is normally used on small punctures up to 3 or 4 inches in maximum dimension and in facings that are made of thin fabric that is difficult to peel. b. Step-Joint Method. The scarf method of repairing a laminated fiberglass face sheet of a honeycomb structure is the easiest method to use. In this type of repair, the damage is outlined with a compass. If a square or rectan gular repair is more appropriate then the dam age is outlined using a straight-edge and a compass to round out the corners. Page 3-4 Par 3-3PDF Image | AFS-640
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