In today´s commercial aircraft, power from the engines is used to supply energy to hydraulic or pneumatic aircraft systems, generate electricity and operate air-conditioning units during the flight. An auxiliary Power Unit (APU) is used to provide the required energy on the ground. Up to 60kg of fuel can be saved on each flight by keeping the use of APUs to a minimum and deploying eco-friendly ground power units (GPU) for good measure. This benefits both the environment and the balance sheet
of the airline. Ecology and economy go hand in hand in the aviation industry :)
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