<![CDATA[This study was conducted to analyze the effect of ATS Inter-facility Data Communication (AIDC) messages in an effort to reduce the workload of Air Traffic Controllers (ATC) at the ACC Upper Surabaya Unit, Airnav MATSC Branch. AIDC serves as a means of exchanging flight information between different ATC systems to support smooth coordination. However, failures in AIDC message transmission at ACC Upper Surabaya still occur, requiring coordination to be shifted to manual methods (voice coordination), which potentially increases the ATC workload. This study employed a quantitative method with a Likert-scale questionnaire as the data collection technique. The data were analyzed through validity tests, reliability tests, normality tests, linearity tests, hypothesis testing (t-test), determination tests, and simple linear regression analysis using SPSS version 25.0. Furthermore, the data were analyzed using statistical methods such as Pearson Product Moment correlation and linear regression. The results showed that the Undelivered AIDC Message variable (X) had a mean value of 55.07, while the ATC Workload variable (Y) had a mean value of 60.23. The regression equation obtained was Y = 10.819 + 0.897X, with a coefficient of determination (R²) of 0.681, indicating that Undelivered AIDC Messages contributed 68.1% to the variation in ATC Workload, while the remaining 31.9% was influenced by other factors outside this study. Thus, it can be concluded that undelivered AIDC messages have a positive and significant effect on ATC workload at ACC Upper Surabaya MATSC.]]>
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