Thesis (M.Eng.)--Chulalongkorn University, 2005

In today's competitive airline environment, maintenance and inventory controls problem have been the primary focus area of maintenance service organization. This problem can be ameliorated by a MRP system. Fortunately, the increasing of the advent of the computer in nowadays gives an opportunity for development of material requirement planning. This study concentrates on the improvement of a spare part inventory control system in Technical department, Thai Airways international Public Company Limited, incorporating a decision support system for inventory management. The decision support system involves determining an optimum ordering policy and making report of planned monthly demand and planned order releases for management level. The causes of an ineffectiveness of the current spare part inventory control system are ameliorated. The method of development included: current system analysis, data collection and analysis, system design and program testing and validation. After testing the program, the proposed system is more cost-effective and more accurate than the current system. The inventory related costs reduced 29.4%. the time spent in spare parts planning and control process, and the shortage were reduced. However, to improve the proposed system to be more accurate, the necessary information such as past demand information should be more gathered. After a system validation by the end users within the Technical department, it was concluded that the program performs the calculation as expected, ease of use, and provides sufficient information for the users.