All ColumbusJACK/Regent towbars are equipped with a hand operated hydraulic pump/tank that supplies a flow of hydraulic oil to a single acting hydraulic cylinder. This cylinder raises or lowers the wheel carriage assembly to which the tires are attached. The towbars are equipped with a jaw type attachment head, which when attached properly allows the aircraft to be pushed or pulled safely. Handles at both ends of the tow bar provide secure handholds for maintenance personnel.