What preferred method is recommended for providing power to the aircraft during deicing?

Using engine operation to provide power to the aircraft during deicing is preferred because it allows for a self-sufficient power supply that can support various systems essential for safe deicing processes. When the engines are running, they contribute to the functioning of hydraulic and electrical systems, which may be necessary for activating deicing equipment and ensuring that anti-ice systems are operational.

Additionally, operating the engines during deicing can help maintain ambient temperatures in critical areas of the aircraft, thus aiding in the effectiveness of the deicing fluids being used and preventing any refreezing of the surfaces. This approach also reduces reliance on external power sources, which might be limited or less reliable under certain conditions.

Furthermore, using an external generator or ground power unit, while feasible, could introduce additional complications such as potential contamination of the deicing fluids from the equipment and the need for additional personnel to manage these power sources. Battery power alone may not provide sufficient energy for the required deicing operations, especially for larger aircraft that demand greater electrical loads. Therefore, running the engines is seen as the most effective method during deicing operations.