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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    Noise Control of Aircraft Auxiliary Power Units

    Callaway, Vernon E. | SAE Technical Papers | 1967


    Diesel auxiliary power units for large aircraft

    Wilson, E.M. | Engineering Index Backfile | 1943


    On-board aircraft auxiliary power systems having dual auxiliary power units

    FILHO ALDEMIRO LORENZINI | Europäisches Patentamt | 2019

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    Auxiliary Power Units for Current and Future Aircraft

    Rodgers, Colin | SAE Technical Papers | 1991