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Repairing The Trailing Edge of an Airfoil
Aircraft Advanced Composite Application Usage

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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Trailing edge repairs to all-metal construction assemblies and/or control surfaces are performed by using basically the same procedures outlined in the chapter titled “Aircraft Metallic Repair.” A typical trailing edge repair to a sandwich construction assembly is shown in figure 14-20. You may use the lap or flush patch, depending on the size of the damage, the type of aircraft, and the assembly or control surface to be repaired. Normally, the flush patch is used on control surfaces to ensure aerodynamic smoothness. TYPES OF ADVANCED COMPOSITE MATERIALS The reduced availability of natural resources, the increasing costs of production, and the apparent limit to our ability to fabricate high strength-to-weight metallic components necessitated the development of new materials to meet the demands of aerospace technology. In the following text, you will be intro- duced to the materials that provide high-performance capability now, with great expectations for the future. These materials are called advanced composite materials and will be used to replace some of the metals currently used in aircraft construction. Advanced composites are materials consisting of a combination of high-strength stiff fibers embedded in a common matrix (binder) material, generally laminated with plies arranged in various directions to give the structure strength and stiffness. The much stiffer fibers of boron, graphite, and Kevlar® have given composite materials structural properties superior in strength to the metal alloys that they have replaced. Specific applications of advanced composite materials and approximate percentages of total aircraft structures for some of our modern-day aircraft are shown in table 14-1. Figure 14-20.—Trailing edge repair (sandwich construction). 14-18







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