Starting from the study of the process of painting and collecting the data of the problem. Analysis of the problem to find out the cause of the problem by Fault Tree Analysis (FTA) and then find out the real reason for amendment. The result of the dust grain in troubleshooting the process of spraying primer causes problems of N2 decreased from the original, by comparison, before the update has an average Hundred Per Unit Defect (DPHU) is located at 2012 DPHU DPHU (K13), 1870 (N17) and after adjustment by the real issues with Fault Tree Analysis (FTA), the problem is that the decrease in 1349, DPHU DPHU (K13) 1375 (N17) is equal to K, 13 dropped 663 DPHU (32%) decrease in 495 DPHU N 17 (26%).