International Mathematical Forum, Vol. 11, 2016, no. 16, 783 - 792 HIKARI Ltd, www.m-hikari.com http://dx.doi.org/10.12988/imf.2016.67101 Evaluation of Spatial Effect for Critical Spare Part Inventory in Multi-echelon System Valeriana Lukitosari Department of Mathematics, Faculty of Mathematics and Natural Science Department of Industrial Engineering, Faculty of Industrial Technology Sepuluh Nopember Institute of Technology, Indonesia Suparno Department of Industrial Engineering, Faculty of Industrial Technology Sepuluh Nopember Institute of Technology, Indonesia I Nyoman Pujawan Department of Industrial Engineering, Faculty of Industrial Technology Sepuluh Nopember Institute of Technology, Indonesia Basuki Widodo Department of Mathematics, Faculty of Mathematics and Natural Science Sepuluh Nopember Institute of Technology, Indonesia Copyright © 2015 Valeriana Lukitosari, Suparno, I Nyoman Pujawan and Basuki Widodo. This article is distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract We study a multi echelon spare parts inventory system which consider some important factors, among others; maintenance of the equipment, pricing, lifetime and distance to the central warehouse. But it turns out a position local warehouse to another warehouse interesting to note as well. Effect of space is called spatial dependence in deciding the allocation of spare parts inventories in multi-echelon systems. Availability of critical spare parts to the essential equipment needed for the equipment can perform its function at a specific time period. Some of the factors that greatly affect the supply of critical spare parts can be prioritized. This