Portable load banks EAL series are developed for temporary load supply during the maintenance, testing, and adjustment of GPUs. This will eliminate and minimize maintenance time and the adjustment of GPUs. In order to avoid problems with the aircrafts after repairing and maintenance of 400 Hz or 28.5 V GPU — our solution is to use ElectroAir control and testing EAL equipment. Using the latest technologies, our load banks are lightweight, compact, and fully independent units. Using ElectroAir load banks provides the possibility to perform engine start simulation as well as carry out regular GPU performance checks. ElectroAir produces 400 Hz AC load banks (up to 180 kVA), 50 Hz and DC load banks (up to 2500 A).