Application of Graphical Evaluation and Review Technique to Determine Product Completion Time in Manufacturing Process

The discrepancy between actual production process time and standard time is often occurs, because the calculation of production time does not take int account the repair time caused by defective products. The Graphical Evaluation and Review Technique (GERT) method is used to determine the production process time by considering repair time due to defective product. GERT is used to calculate the average and variance of the production time in stochastic work network and put into consideration the possibility of rework so that the completion time is close to the actual condition. The calculation results show a difference between the standard production time of the front spar component of 3,841.69 minutes/unit and the rear spar of 4,080.81 minutes/unit, while based on the GERT method the production time of the front spar is 4,657.77 minutes/unit and the rear spar is 4,406.01 minutes/unit.