The UPG-300 is designed for testing aircraft hydraulic systems in ground conditions. It is used to supply fluid to aircraft hydraulic systems with the required pressure and supply, to check for leaks and pressure testing of units and hydraulic systems of aircraft and hydraulic units, to refill aircraft hydraulic systems with working fluid, to check units of aircraft hydraulic systems for operability, to supply electric current to units related to the operation of aircraft hydraulic systems and hydraulic units. The vehicle may be operated at ambient air temperature ±45°C.