This paper presents the results of a numerical study of the flow of an airplane with a mechanized high aspect ratio wing when the wingtips blown by jets of propellers. The layout of the aircraft with a pulling two-bladed propeller, as  well as without installed propellers, is investigated. The effect of propeller slipstream on the airplane aerodynamic characteristics and the hinge moments of the flaps and ailerons is shown. It is shown that the external aileron is exposed to the greatest impact of the propeller slipstream. An increase in the underpressure on the upper surface and a strongly increasing pressure on the lower windward side of the aileron leads to a significant increase in the  hinge moment of the external aileron when blown by jets of propeller.