Graphical presentation of the resulting dependencies is
shown in Fig. 6. As evident from the charts in Fig. 6 the
subsystem is replaced much sooner than its optimum period of
service is achieved. If the subsystem was not replaced and left
in the vehicle for further use (until its optimum length of
operating time is achieved), then the total unit costs would
continue to decrease. Thus, replacement of the subsystem after
covering 12 000 km is not optimum in terms of cost
efficiency.