A lifting step assembly for helping a user entering a cabin of an industrial vehicle, the lifting step assembly comprising: - a first step member on which the user can stand, the first step member being configured for selectively moving along a first translation direction between a first position said lower position and a second position said upper position, so that the user can be lifted from the first position to the second position, - a second step member configured for being moved between a retracted position and a deployed position in which the second step member projects out of the first step member in a direction transverse to the first translation direction of the first step member, so that the user can stand on the second step member when the second step member is in the deployed position, - a deployment mechanism configured for moving the second step member from the retracted position to the deployed position in response to the distance between the first step member and the second position becoming lower than a predetermined threshold (Th), characterized in that the lifting step assembly further comprises - an electric motor rigidly linked to the first step member, the electric motor comprising a first driving pinion, - a rack configured for being fixed to a structural element of the industrial vehicle, the first driving pinion being engaged with the rack so that the first step member moves from the first position to the second position in a first rotation direction of the electric motor, and the first step member moves from the second position to the first position in a second rotation direction of the electric motor opposite to the first rotation direction, and in that - the deployment mechanism comprises an input member and an output member that can be mechanically connected and disconnected from the input member by a clutch mechanism, - the electric motor comprises a second driving pinion engaging with the input member of the deployment mechanism, and - the second step member is mechanically linked to the output member. - a first step member on which the user can stand, the first step member being configured for selectively moving along a first translation direction between a first position said lower position and a second position said upper position, so that the user can be lifted from the first position to the second position, - a second step member configured for being moved between a retracted position and a deployed position in which the second step member projects out of the first step member in a direction transverse to the first translation direction of the first step member, so that the user can stand on the second step member when the second step member is in the deployed position, - a deployment mechanism configured for moving the second step member from the retracted position to the deployed position in response to the distance between the first step member and the second position becoming lower than a predetermined threshold (Th), characterized in that the lifting step assembly further comprises - an electric motor rigidly linked to the first step member, the electric motor comprising a first driving pinion, - a rack configured for being fixed to a structural element of the industrial vehicle, the first driving pinion being engaged with the rack so that the first step member moves from the first position to the second position in a first rotation direction of the electric motor, and the first step member moves from the second position to the first position in a second rotation direction of the electric motor opposite to the first rotation direction, and in that - the deployment mechanism comprises an input member and an output member that can be mechanically connected and disconnected from the input member by a clutch mechanism, - the electric motor comprises a second driving pinion engaging with the input member of the deployment mechanism, and - the second step member is mechanically linked to the output member.