The needs, acquisition and distribution of spare parts in an optimized way is very important to support efficiently the logistic maintenance system. This job development, searching a case study that it had its scope in based real data existent on the technical and commercial Proposal for VHF communication Netware, has been worked this subject showing the comparison between the model now used in the Brazilian Air Space Control System and this entitled study model MULTI-ECHELON TECHNIQUE FOR RECOVERABLE ITEM CONTROL (METRIC) that it was developed to calculate of spare parts stocks level for the American Air Force. The main core for this comparison was to find the existent difference between the model what predicts the needs and replacement for the available stock levels of the item on hand against the another one that it works with an optimized analysis of the system availability. When it is used the techniques of the METRIC modeling, the product of this comparison demonstrated appreciable improvement of the logistics process and, mainly, for the budget resources, improving the strategic distribution of the spare quantity in the several echelons and in the availability of the items in system. Finally, observing the improvement by the calculated results of this job and considering the diffusion and acceptance of the METRIC model in the several companies and government organizations around the world. At the final, this job proposes that the logistics System of the Air Space Control becomes to consider the using of the tested model in the implementation for the new system and it may obtain significant winnings for the operational and logistics area.