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Hypersonic aircraft represent a radical departure from contemporary air vehicles in terms of system performance requirements and operating envirnoment. Flight control components may encounter environmental temperatures as high as 1600 F during high Mach number cruise. A basic re-evaluation of auxiliary power distribution techniques has been made to determine the type of system most suitable for use under these conditions. Five types were considered: 1. Cooled hydraulic system. 2. Liquid metal system. 3. Pneumatic system. 4. Pulsating flow hydraulic system (using conventional fluid in the moderate temperature, and liquid metal in the higher temperature portions of the vehicle). 5. Mechanical system. These systems have been evaluated for use in a high Mach number cruise aircraft on the basis of weight, power requirements, and cooling requirements.