Abstract: “Manufacturing company is producing lorries in large amoung thus the company is demanded to mantain and increase the consistency of the company in quality and quantity of each product unit in production process. This is done to ensure the survivability of the company in competition with the competitors. After a long operational duration, a product defect is detected due to producti on process, the research thus aimed to supervise and identify the source of the defect. Failure Mode and Effect Analysis (FMEA) is a method that can be used to identify the cause of defect in a production process. Thus using this method, an analysis of rel ated factor in production process can be conducted. The result of the research showed that error was mostly happened in iron plate cutting process due to inexperienced operator, where the value of Risk Priority Number (RPN) was 21 and other process was hav ing the value of 245. As a conclusion, the greatest defect in production process was caused by the ope”

Keywords: Product defect, Failure Mode and Effect Analysis (FMEA),Operator, Quality, Risk Priority Number (RPN)