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Abstract
The reliability of aircraft fuel systems is a critical factor in ensuring flight safety and engine performance. Monitoring fuel temperature and boost pump outlet pressure plays an essential role in maintaining stable fuel distribution to the engine. However, cockpit indicator failures, such as fuel temperature bulb malfunctions, can reduce monitoring effectiveness and increase operational risks. This study aims to design and develop an Internet of Things (IoT)-based monitoring system prototype as a secondary monitoring solution. The proposed system utilizes a DS18B20 temperature sensor, a pressure transducer, a flow sensor, and an ESP32 microcontroller for data acquisition and processing. The collected data are transmitted in real time to a Firebase Realtime Database and displayed via a mobile application developed using MIT App Inventor. The research employs a quantitative experimental approach with a Research and Development (R&D) model. Experimental results indicate that the temperature sensor achieves an average accuracy above 97%, while the pressure sensor demonstrates a linear response to pressure variations. Furthermore, the IoT communication system operates reliably, with real-time data transmission delays of less than two seconds. These results demonstrate that the developed system enhances the effectiveness, accessibility, and reliability of monitoring aircraft fuel system parameters.