What role does the APU play during high-temperature ground operations?

The Auxiliary Power Unit (APU) plays a crucial role during high-temperature ground operations by providing cooling air. In hot weather conditions, the APU helps to alleviate the heat buildup in the aircraft's systems and cabin by delivering conditioned air. This ensures that the crew and any passengers remain comfortable and that sensitive electronic systems do not overheat, which can compromise performance and safety.

While the APU is also capable of generating electrical power, its primary purpose during high-temperature ground operations focuses on supplying conditioned air. Other systems, such as fuel systems and hydraulic systems, have specific functionalities that are not directly related to managing temperature exposure during ground operations. Therefore, the focus on providing cooling air reflects the APU's essential function in maintaining a safe and operable environment for both personnel and aircraft systems.