ABSTRACT
Production and maintenance can run well if the process of planning and controlling spare part inventory is executed correctly. In fulfilling the inventory, the delay in supplying spare parts does not only cause operational and financial risks, but also triggers a legal risk. Based on the Pareto chart data taken from ERP SAP since 2016, the procurement cycle time of goods in PT. Petrokimia Gresik has been below the target and user expectations. The realization of the average cycle time for the procurement process (PR-PO) is 71 days, longer than the agreed standard cycle time of 42 days. Thus, this research was conducted to analyze the dominant causal factors using the Lean Six Sigma and MAFMA methods. The observation adopts the DMAIC stages by using a waste questionnaire distributed to related-function experts and root cause analysis (RCA). The finding of this research is used as a reference for improvement by managers.
