This paper presents a study of a wrought AlCu2Mg1,5Ni aluminum alloy, that is used for aeronautical parts. This alloy is heat treated in order to establish the optimal mechanical properties, and we are referring especially at microhardness, tensile strength and elasticity. So, we took 13 parts of identical dimensions made of this alloy and applied the final heat treatment. At the end we were studying the microhardness and mechanical properties in order to establish the optimal technology. This paper contains a study regarding the improvement of heating furnaces, which determine a better heat treatment technology for aluminum alloys and low energy consumption. We have made experiments in the same conditions of preheating for the furnace and used the same equipment for the stress and microhardness determinations. With the results, using 3^k factorial experiment model and with a specific computer program we obtained the regression equation, that describes the process. As a conclusion, the paper presents the algorithm for applying the optimum heat treatment in order to obtain the necessary properties for the working parts.