The present invention provides vectors that contain and express in vivo or in vitro FeLV antigens that elicit an immune response in animal or human against FeLV, compositions comprising said vectors andor FeLV polypeptides, methods of vaccination against FeLV, and kits for use with such methods and compositions. The output gearbox may surround a brake piston assembly of the wheel of the aircraft. The EMP polymer layer has a first surface and a second surface on which one or more electrodes are provided.