Work describes an approach to define distortions of a form of low-rigid parts of aviation equipment connected with residual stress being the consequence of cutting and previous production operations. To solve this, the study uses AdvantEdgeTM and Production Module software by Third Wave Systems, Inc. (USA) specializing in machining modeling. The finite-element model of a part is created on the basis of geometry of initial workpiece using Boolean subtraction tool taking into account its trajectory. The model considers strain hardening, thermal influence and cutting speed. The residual stress diagrams caused by cutting are defined by finite-element modeling for various modes and conditions of processing with thermomechanical relaxation of a workpiece material and are kept in the corresponding database. When modeling the process of forming there is a need to calculate forces caused by cutting and imbalance of the initial residual stress diagram. These forces are applied to grid point of final elements of a model surface. The technique to define these forces is not given in work. The authors suggest to define the initial residual stress of a workpiece based on literature sources or using the results of thermal treatment modeling and to keep the obtained data in a special database. The standard residual stress diagram defined at finite-element modeling of cutting is shown in Figure 3a