Manufacture of aircraft gearbox elements requires control of gear geometric parameters at different stages of technological process. The aim of this study is to present develop and execute the analysis accuracy of the geometry of the gear of aeronautical dual-power path gear after the roughing operation using coordinated optical scanner ATOS II Triple Scan. Research was carried out in order to detect errors occurring in the machining process and to determine the value of founded the machining allowance finishing in relation to the CAD model. On this basis, it is possible to determine the accuracy of the gear wheel as the workpiece after heat treatment. The results will be the basis to determine the effect of heat treatment on changes in the geometry of the gear and the benchmark for determining the correctness of the finishing.