The auxiliary power units designed for wide-body aircraft shall closely meet the requirements concerning especially the reduction of consumption, weight, dimensions and maintenance cost. Meeting these imperative requirements is obtained thanks to a highly detailed analysis of the various aircraft power requirements and utilization of a load compressor and a digital-type regulation. Further improvements in the near future consist in optimization of the APU characteristics by using a free turbine generator and a load compressor flow regulation which takes the variable air requirements of the aircraft into account.


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