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Using Human Factor Analysis and Classification System (HFACS), this research aims to know how external environment, organizational influence, unsafe supervisor, and precondition of unsafe acts contribute to unsafe acts (human error) in aircraft maintenance, and the relationship between each factor using PLS-SEM to conduct exploratory research. Study case in Garuda Indonesia Aircraft Maintenance proved that precondition of unsafe acts is the most contributing factor for human error in maintenance. Therefor the company should address more attention in precondition of unsafe acts.