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Air traffic controllers need constant vigilance to properly monitor the speed, position, andaltitude of aircraft. Subsequently, due to the high risk, officers do not need to experience excessive fatigue during working hours. Therefore this study aims to determine the work-related factorsresponsible for fatigue in air traffic controllers. The fatigue was measured by self -rating before and after one shift included mental fatigue and drowsiness using the Samn-Perelli scale, Karolinskasleepiness ccale (KSS), and visual fatigue scale. Furthermore, this study also analyzed the work-related factors, namely work units, workload, shift, and workdays. The results showed that shiftssignificantly differentiated the fatigue of the three scales, especially at night compared to morning and day. Meanwhile, the difference in mental workload only distinguishes the value of visual fatigue.In conclusion, the working conditions of air traffic controllers causes fatigue, therefore, air traffic service management needs to use these findings to set work schedules.

Mental Fatigue; Sleepiness; Visual Fatigue; Air Traffic Controller