37 Maintenance and repair of motors, namely, aircraft motors, actuators, namely, electrohydraulic actuators, emission reduction units, namely, transmissions enabling an aircraft to be moved, steered, slowed or stopped during taxiing or during the phase prior to take-off or subsequent to landing; maintenance and repair of emission reduction units, namely, transmissions to turn one or more wheels of an aircraft to enable it to be moved, steered, slowed or stopped during taxiing or during the phase prior to take-off or subsequent to landing; repair and maintenance of electrotechnical, electronic or computer apparatus and instruments for controlling, analyzing, managing, monitoring or checking elements of the landing gear of an aircraft, namely, landing gears extension/retraction systems, steering systems and braking systems; maintenance and repair of batteries; maintenance and repair of capacitors, electronic devices, namely, electronic controllers, electronic accumulators, electronic components, namely, test boxes, sensors, cards, namely, microchip cards, blank USB cards, enabling the collection, storage and restitution of the power generated while an aircraft is taxiing, or during the phase prior to or subsequent to landing, or prior to take-off; maintenance and repair of computer software for moving, steering, braking or stopping an aircraft during taxiing or during the phase prior to landing; maintenance and repair of computer software used for controlling, analyzing, managing, monitoring or checking elements of the landing gear of an aircraft; repair and maintenance of devices in the nature of systems and equipment enabling an aircraft to be moved, steered, slowed or stopped during taxiing or during the phase prior to take-off or subsequent to landing, namely, steering systems, electric taxiing extension/retraction systems; repair and maintenance of devices in the nature of systems and equipment for controlling, analyzing, managing, monitoring or checking elements of the landing gear of an aircraft, namely, braking systems; maintenance and repair of devices in the nature of systems and equipment for cooling parts of the landing gear of an aircraft or elements used to control, analyze, manage, monitor, check, move, steer, slow or stop an aircraft during taxiing or during the phase prior to take-off or subsequent to landing, namely, landing gears, wheels and brakes