The AERO Specialties JetGo 550Mti 28.5V DC diesel-electric hybrid aircraft ground power unit (GPU) provides continuous and peak power in addition to offering advanced aircraft protection systems. JetGo GPUs have been specifically designed to meet the increasing demand in the aviation industry for a quieter, yet powerful, “green” ground power unit. With an EPA Tier 4 rating for low-emission non-road diesel engines, JetGo GPUs meet all current air quality emission standards.