The article deals with the presentation and analysis of hazardous situations, damage events and accidents caused by light and medium unmanned free balloons and the parts of them. During the flights of these balloons, emergencies, hazardous situations, and accidents can occur in many different ways. Hazardous situations and damages at the process of landing and after it have also many different variations. At the end of the article we draw conclusions based on the previous analyzes.

This paper describes and inspects unmanned aerial vehicle, unmanned aircraft system, unmanned aircraft system traffic management, light and medium unmanned free balloons. It presents future safety developments and goals of the European Union’s own airspace, but also the Hungarian free route airspace. The development and realization of Swiss U-Space is discussed. Hungarian flights statistics are analyzed. Based on statistics, realized and under development solutions there are recommendations in the paper for the integration of the flight tacking for the mentioned balloons. A real flight tracking test has been done and it is shown in this paper. Its properties are analyzed with conclusions for possible usage.

In this study, we first performed a comprehensive structural analysis of four models of radiosondes (devices intended for use as the meteorological probe of a sounding balloon) manufactured by three different companies – Graw, Vaisala and Meteomodem. The radiosondes were disassembled for visual inspection and manual measurement, three-dimensional computed tomography images were taken of their inner structure, and the outer shapes of the radiosondes were scanned with a structured-light three-dimensional scanner. The structural properties of the radiosondes thus identified were then compared to one other, based on which the Meteomodem M10 was ranked as the least harmful in a potential collision. Next, the Meteomodem M10 radiosonde was used in collision tests with a heavy target and with a pumpkin model, in order to evaluate the possible damage caused by and to the radiosonde in different types of collisions.