The article gives a tool for assessing the risks of R&D projects implementation in high-tech enterprises including aerospace industry. The tool is algorithms and calculation formulas that help to make risk assessments at each stage of project implementation. Special attention is attached to the analysis of the most common risks that arise in the course of R&D projects implementation. These risks are divided into three groups: risks that affect the project R&D projects deadlines; risks, affecting the R&D projects financing; risks, associated with the technological characteristics of the projected facility features. This can be fully applied for innovative projects in aerospace industry including development of new materials and composite technologies. The calculation algorithms of the techniques are adapted for computer calculations and the use of statistical data instead of expert estimates contributes to the increase of accuracy and objectivity of calculations. © 2019 Published under licence by IOP Publishing Ltd.