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A method and apparatus for conditioning a supply of bleed air from an aircraft engine to a system using such bleed air, including passing the bleed air to a turbine over which the air is expanded to produce a power output, and regulating the power output thereby to control the condition of the air d

A method and apparatus for conditioning a supply of bleed air from an aircraft engine to a system using such bleed air, including passing the bleed air to a turbine over which the air is expanded to produce a power output, and regulating the power output thereby to control the condition of the air downstream of the turbine.

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1. A method of conditioning a supply of hot pressurized bleed air from an aircraft engine prior to providing the bleed air to a downstream air cycle air-conditioning system, the method including passing the hot bleed air to a turbine over which the bleed air is expanded to produce a power output, an

1. A method of conditioning a supply of hot pressurized bleed air from an aircraft engine prior to providing the bleed air to a downstream air cycle air-conditioning system, the method including passing the hot bleed air to a turbine over which the bleed air is expanded to produce a power output, and regulating the power output thereby to control the condition of the air downstream of the turbine. 2. A method according to claim 1 wherein an electrical generator is driven by the turbine. 3. A method according to claim 2 wherein an electrical power output of the generator is controlled to regulate the expansion of the air in the turbine. 4. A method according to claim 1 which includes sensing at least one parameter of the bleed air downstream of the turbine and changing a load on the power output depending upon the sensed parameter thereby to regulate the condition of the bleed air. 5. A method according to claim 1 wherein the bleed air is expanded and cooled as the bleed air passes over the turbine and used to cool a heat load. 6. Apparatus for conditioning a supply of hot bleed air from an aircraft engine prior to providing the bleed air to a downstream air cycle air conditioning system, the apparatus including a turbine providing a power output as a result of expansion of the hot bleed air over the turbine, and a controller for regulating the power output and thereby controlling the condition of the bleed air downstream of the turbine. 7. Apparatus according to claim 6 wherein an electrical generator is driven by the turbine, an electrical load on the generator being regulated by a controller in response to an input from a sensor sensing at least one parameter of the bleed air downstream of the turbine. 8. Apparatus according to claim 6 further including a bypass though which at least a proportion of the bleed air can pass to the system where it is to be used other than by way of the expansion device. 9. Apparatus according to claim 8, wherein the proportion of the bleed air passing through the bypass is determined by a valve whose operation is controlled by the controller. 10. Apparatus for conditioning a supply of bleed air from an aircraft engine to a system utilising such bleed air, the apparatus including a turbine providing a power output as a result of expansion of the bleed air, and a controller for regulating the power output and thereby controlling the condition of the bleed air downstream of the turbine, wherein an electrical generator is driven by the turbine, an electrical load on the generator being regulated by a controller in response to an input from a sensor sensing at least one parameter of the bleed air downstream of the turbine, and wherein the sensor for providing an input to the controller is responsive to one or more parameters including turbine speed, turbine inlet pressure, turbine inlet temperature, turbine outlet pressure, and turbine outlet temperature, the controller responding to the one or more inputs by regulating the electrical load to increase or decrease turbine speed so that the pressure of bleed air downstream thereof is maintained in a generally steady state. 11. Apparatus according to claim 10, wherein the controller is further responsive to signals relating to operational conditions of the aircraft and/or an engine or engines thereof. 12. A method of conditioning a supply of hot pressurized bleed air from an aircraft engine prior to providing the bleed air to a downstream air cycle air conditioning system, the method including passing the hot bleed air to a turbine over which the bleed air is expanded to produce a power output, and regulating a load on the power output of the turbine to control the temperature of the air at a location downstream of the turbine.