<![CDATA[This study analyzes and compares the performance of the Auxiliary Power Unit (APU) and Ground Power Unit (GPU) and evaluates their effects on the Airbus A320 electrical system during ground operation. The comparison is based on technical parameters, including power, voltage, current, and frequency, as well as operational factors affecting the reliability and efficiency of electrical power supply. The research employed field observations, document review, interviews, and data analysis. The collected data were analyzed using mathematical calculations to evaluate the capability of the APU and GPU in supplying the aircraft's electrical load. The results show that the APU provides greater operational flexibility because i t supplies both electrical power and bleed air for engine starting and air conditioning, whereas the GPU functions only as an external electrical power source. The Airbus A320 requires approximately 25.3–32.8 kW during ground operation, and both the 72 kW TLD 90 kVA GPU and Honeywell 131-9A APU can adequately meet this demand with sufficient power reserve. Therefore, the choice between the APU and GPU is mainly determined by operational factors such as fuel consumption, operating costs, emissions, and noise rather than electrical power capacity.]]>
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