Abstract: A method for prohibiting the propulsion of an electrical airplane when the airplane is galvanically connected to a ground station. The electrical airplane comprises a battery assembly, a low voltage electrical network provided with power contactors, at least one integrated electrical propulsion system and a processor. The method comprises steps of detection of a connection to the ground station by the battery assembly, of non-supply of the integrated electrical propulsion systems and of their switch to protection mode, and of stopping of the propulsion systems regardless of their supply of electrical energy and the user set point.