The 4400 engine drive GPU provides a quiet, fuel-efficient apron power system. It is easy to move around, remarkably tough and supremely reliable. The low-profile design, mounted on a towable trailer with fifth-wheel steering, makes this ultra-reliable engine-driven 400 Hz GPU easy to maneuver around the congested apron areas of modern airports. Due to the low weight of the GPU, you can tow it around even with small towing equipment thus reducing the total cost of ownership. The 4400 is available in a dual voltage AC/DC version. This combo unit is capable of delivering 400 Hz and regulated 28.5 VDC power, simultaneously and independently! The 28.5 V Active Rectifier Unit (ARU) - available as a standard option - delivers superior voltage quality at the aircraft plug without jeopardising the 400 Hz voltage. The ITW GSE 4400 will power your aircraft, whether a narrow body or a turbo prop.