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An Energy Efficient Environmental Control System (EEECS) for a patrol-type aircraft has been developed and tested. Benefits of the system include not only substantial fuel savings, but also significant increases in avionics reliability through reduced cooling air temperatures supplied to aircraft electronics by the system. Testing was conducted in a laboratory to demonstrate energy efficiency throughout a wide range of operating conditions and in a Navy P-3C aircraft to demonstrate flight-worthiness of the system. This paper discusses the results of both the laboratory and flight tests. The heart of this vapor-cycle system is an electrically-driven, variable-speed centrifugal compressor that operates at speeds from 30,000 to 70,000 RPM. The compressor uses oil-less, tilt-pad, hydrodynamic bearings for maintenance-free operation.