Abstract. This article examines the effectiveness of using a helicopter with an onboard bucket
to extinguish mountain and forest fires. The article presents calculated and experimental data on the
dynamics of spill devices along the outer loop of helicopters in the process of draining working fluids
from them when extinguishing forest fires under conditions of intense convective flows in the fire
zone, the main conclusions and recommendations are formulated. Ensuring flight safety and fire
extinguishing efficiency in these conditions.

Keywords: Drainage devices, Bambi, VSU-5, fire extinguishing efficiency, information
system, civil aviation, transport.