The object of investigation is the process of spraying of the anti-icing reagent. As an object of research, external forces are selected that affect on each drop of the reagent: counteraction forces, gravity forces, Coriolis force and centrifugal inertial forces, lifting force, frictional forces of the reagent on the surface of the working equipment: disk and blades. It is assumed that the liquid reactant is fed under pressure to the hydraulic nozzles installed in the disk casing, and then falls onto the distribution disk. The tasks solved within the framework of the article: the identification of external forces acting on each drop of the reagent from the moment of flow from the nozzle to the moment when it reaches the coating, the study of the effect of external forces on the characteristics of droplet motion, the mathematical description of the process of formation of the sputtering zone. To refine the droplet motion characteristics under the action of external forces using the already available mathematical description of the droplet motion along a distribution disk, a mathematical model of their motion in the air environment has been developed. The equation of motion of the drops of the reagent, the dependences of the droplet's flight range on the mode and parameters of the working equipment are obtained. Meteorological factors such as wind speed and direction, as well as air environment properties (dynamic and kinematic viscosity, depending on the temperature of the medium) are considered in the simulation. This model will provide an opportunity to the reasonably assignation of the parameters of the distribution equipment during their design and operation and will also serve as a base for mathematical and software systems for the continuous monitoring of the process of applying liquid reagents for road and airfield pavements. Its operation will allow to provide a high-quality treatment of coatings ensuring the preservation of their operational properties and to make a reagent savings.