The use of advanced composite materials (ACMs) in airplane structures has continued to increase. Recently, the use of ACMs for newly developed commercial transport reaches more than 50 percent of the structure weight. The use is extended from secondary structures as fairings and doors to control surfaces and primary structures as empennages, wings and fuselage. Especially the use of carbon fiber reinforced plastics (CFRP) to the structure components provides the performance benefits by reduction of weight. In this paper, as for the well-known commercial airplanes, relations between unit empty weights (WEs) and percentages of ACMs weight are shown and discussed. The unit WE of each airplane is calculated from WE, design range and number of passengers. Other advantages of using ACMs compared to the conventional aluminum alloy are shown and discussed. Those are corrosion problems, reducing detailed parts counts, aerodynamic efficiencies and others. Some issues and author's study about the repair of damaged components are shown.
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