A Study on Calculation Method of Spare Parts Amounts according to DMSMS: A Case Study of CH-47D Old Engine

Abstract

DMSMS management in military defense is a series of work systems to prevent increased maintenance costs and decrease equipment operation rates due to discontinuation of repair parts during the acquisition and operation stages of weapon systems. Proactive management for part-discontinuation management includes design for discontinuation management, standardization of parts, and establishment of a discontinuation management system. Post-management includes methods of part replacement, securing inventory, and design changes. This study is a case study on securing the inventory of weapon-system components scheduled to be discontinued, which is a follow-up management measure. The old engine of the CH-47D helicopter has been discontinued and must be operated for approximately 10 years before a new helicopter is put into service. In accordance with the discontinuation of the old engine, a method for calculating the required amount of repair parts for the old engine for maintenance during the remaining operating period is proposed. The first step is to determine the number and timing of old engines that will undergo planned maintenance during their remaining operating periods. The amount and timing of maintenance engines were determined by equipment that reaches its life-cycle limit first. Secondly, the amount of repair parts required for old engines undergoing maintenance was predicted.