To provide an air conditioning system for aircraft capable of preventing the generation of choking in a flow passage of a condenser by freezing without heating the flow passage with the bleed air of an engine.

This air conditioning system for aircraft is provided with a compressor 1, a water extractor 7 for separating the moisture from the compressed bleed air, and an expansion turbine 8 for expanding the bleed air, from which the moisture is separated, to lower the temperature of the bleed air. As a cooling means for cooling the bleed air flowing in a bleed air flow passage on this side of the water extractor 7, this system has a condenser 6 for exchanging the heat between the high-temperature engine bleed air, which flows in the flow passage between the compressor 1 and the expansion turbine 8, and the low-temperature air led from an outlet of the expansion turbine 8. When the low-temperature air flows out of the outlet of the expansion turbine 8, the heat is exchanged between the coolant of electronic equipment 13 led to a double tube 16 by the freezed moisture, which is separated by the centrifugal force generated by a turning flow generating means 15 arranged between the outlet of the expansion turbine 8 and an inlet of the condenser 6.

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