A wheel drive unit for attachment to an aircraft running gear, said wheel drive unit including a drive motor or a drive motor with subsequent transmission and comprising the following features: (a) a mounting component adapted to be mounted to a supporting component of the aircraft running gear on which supporting component at least one wheel of the aircraft running gear is supported so as to be rotatable about a central axis of the supporting component; (b) a coupling component releasably anchored to the mounting component and non-rotatably fixed by engagement with the mounting component or the supporting component of the aircraft running gear; (c) the drive motor or the drive motor with subsequent transmission being supported by means of the coupling component such that the coupling component provides for torque support of the drive motor or of the drive motor with subsequent transmission; (d) the torque output of the drive motor or of the subsequent transmission being adapted to establish a torque-transmitting connection to a wheel of the aircraft running gear when the wheel drive unit is attached to the aircraft running gear; (e) and the wheel drive unit - without the mounting component - being demountable from the aircraft running gear, when the anchoring to the mounting component is released; (f) and comprising a pluggable connection for connecting at least one pair of electric line sections and/or at least one pair of fluid line sections, characterised in that a first part of the pluggable connection is mounted on the mounting component and a second part of the pluggable connection is mounted on the coupling component, such that said demounting of the wheel drive unit from the aircraft running gear also separates the second part of the pluggable connection from the first part of the pluggable connection. (a) a mounting component adapted to be mounted to a supporting component of the aircraft running gear on which supporting component at least one wheel of the aircraft running gear is supported so as to be rotatable about a central axis of the supporting component; (b) a coupling component releasably anchored to the mounting component and non-rotatably fixed by engagement with the mounting component or the supporting component of the aircraft running gear; (c) the drive motor or the drive motor with subsequent transmission being supported by means of the coupling component such that the coupling component provides for torque support of the drive motor or of the drive motor with subsequent transmission; (d) the torque output of the drive motor or of the subsequent transmission being adapted to establish a torque-transmitting connection to a wheel of the aircraft running gear when the wheel drive unit is attached to the aircraft running gear; (e) and the wheel drive unit - without the mounting component - being demountable from the aircraft running gear, when the anchoring to the mounting component is released; (f) and comprising a pluggable connection for connecting at least one pair of electric line sections and/or at least one pair of fluid line sections, characterised in that a first part of the pluggable connection is mounted on the mounting component and a second part of the pluggable connection is mounted on the coupling component, such that said demounting of the wheel drive unit from the aircraft running gear also separates the second part of the pluggable connection from the first part of the pluggable connection.