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9/8/98 AC 43.13-1B Ends of reinforcement plates should be feathered out Section A-A with a 5:1 slope. FIGURE 1-7. Repairs to built-up “I” spar. a. Rib Repair Methods. Acceptable methods of repairing damaged ribs are shown in figure 1-11. Wood ribs should not be nailed to wood spars by driving nails through the rib cap strips, as this weakens the rib materially. The attachment should be by means of adhe- sive with cement coated, barbed, or spiraled nails driven through the vertical rib members on each face of the spar. b. Compression Rib Repair. Acceptable methods of repairing damaged compression ribs are shown in figure 1-12. (1) Figure 1-12(A) illustrates the repair of a compression rib of the “I” section type; i.e., wide, shallow cap strips, and a center ply- wood web with a rectangular compression member on each side of the web. The rib is assumed to be cracked through the cap strips, web member, and compression member in the illustration. Cut the compression member as shown in figure 1-12(D). Cut and replace the aft portion of the cap strips, and reinforce as shown in figure 1-11. The plywood side plates are bonded on, as indicated in figure 1-12(A). These plates are added to reinforce the dam- aged web. (2) Figure 1-12(B) illustrates a com- pression rib of the type that is basically a stan- dard rib with rectangular compression mem- bers added to one side and plywood web to the other side. The method used in this repair is essentially the same as in figure 1-12(A) ex- cept that the plywood reinforcement plate, Par 1-46 Page 1-19PDF Image | AFS-640
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