What is the purpose of a Ground Power Unit (GPU)?

The purpose of a Ground Power Unit (GPU) is to supply power to start engines in remote locations. When aircraft are at airports or in areas where they are not connected to the main power grid, a GPU can provide the necessary electrical power to start the engines without relying on the onboard battery. This is particularly important for larger aircraft that require significant amounts of power for engine startup and systems checks before takeoff.

Using a GPU enhances operational efficiency, as it allows the aircraft to be started in locations where traditional startup methods may not be feasible. This capability is crucial in ensuring that airlines can maintain schedules and operational readiness without requiring the aircraft to return to a hangar or maintenance area just to start the engines.