The article deals with the selected aspects of quality control of aircraft accessory drive train bodies. The work presents the concept of control of selected dimensional and shape characteristics. The key issue under consideration is the possibility of replacing the coordinate measuring machines (CMM) in selected measuring operations with a computerized numerical control (CNC) machine, which leads to a lower load on the measuring laboratory. In order to determine the relationship between the measurement results on the CMM in an unmounted state and the results of measurements on the CNC machine in the mounted state, a neuro-fuzzy model was used. The problem is presented for a selected component, which is the cover of the transmission body. Detailed analysis, calculations and neuro-fuzzy modelling of the dependencies between the measurement data were carried out for the selected key geometric characteristic, i.e., the bearing seat position deviation. The obtained results are acceptable from the point of view of quality control.