Bachelor thesis deals with the topic of the influence of external conditions on extinguishing forest fires air technique. The aim of the bachelor thesis was to discuss the appropriateness and effectiveness of the deployment of aircraft to extinguish forest fires. Subsequently, we examined and assessed the impact of external atmospheric conditions on the forest fire suppression. The technique described in the thesis is usually deployed mainly to suppress fires in an inaccessible terrain, where firefighting equipment and vehicles cannot access. In the first part, we address the problem of forest fires and the aerial firefighting methods. In the next section, we looked at more specific principles of forest fires suppression in case studies. We described the technical and operational procedures, the time of the helicopter´s deployment, and its limitations. Furthermore, atmospheric conditions which prevent the take-off are characterized. Before the conclusion, we also described the adverse conditions of the fire scene, which prevent the deployment of aviation equipment.We found, when the aviation technology is deployed effectively, and when it is not, what climatic conditions influence the deployment of aviation technology and what aviation technology is used for fighting forest fires.