To reduce consumption of engine fuel required for air-conditioning at a high altitude.

This device is provided with an exhaust using air-conditioning system A having an air cycle machine 12 comprising a compressor 12a for compressing the outside air or fan bleeding 11A of a turbo fan engine and supplying the compressed air into the aircraft and an exhaust turbine 12b using exhaust air 11C to the outside as a power source, and an air cycle air-conditioning system B using bleeding 1A from an APU or an engine compressor as operation energy. Only at the high altitude cruising, the exhaust using air-conditioning system A is operated, and the bleeding 11A is dispensed with, and thereby the fuel consumption can be reduced.

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