Abstract <p>An experimental study and modeling of the moisture transfer in a VKU-39 carbon-fiber-reinforced plastic is conducted. It is shown that increasing the surface density of a carbon cloth from 200 up to 280 g/m² in VKU-39 promotes a twofold decrease in ultimate moisture saturation and moisture diffusion coefficient in the warp direction. The strength indicators of VKU-39 with different surface densities of the carbon cloth in the initial state and after 1, 3, and 5 years of exposure in the moderate climate of Moscow and temperate climate of Gelendzhik are measured. An increase in the surface density of the cloth of the carbon-fiber-reinforced plastic positively affects the preservation of its ultimate compression and bending strengths measured at room and operating temperatures. The obtained results prove the potential of the use of a carbon-fiber-reinforced plastic based on a VSE-1212 binder and a VTkU-2.280 cloth for the fabrication of the external contour parts of aircraft equipment.</p>