The Hobart Jet-Ex 4D is a diesel engine driven, self-contained, trailer-mounted generator set designed to generate and deliver 28.5 volts DC power to an aircraft when its on-board generators are shut down. In addition to providing continuous, regulated power to the aircraft, the unit is designed for starting any fixed-wing aircraft or helicopter which is equipped with an external 28.5 volt DC power receptacle. Victory Ground Support Equipment has many reconditioned used aircraft ground power units for sale or rent. Please contact us today for details on this unit, or any of our other used gse for sale.