The Development of a Secondary Power System for a Commercial Supersonic Air Transport

A secondary power system in which all secondary power was extracted from the engine by means of large, variable-voltage, variable-frequency generators was proposed for the Lockheed Phase I SST. The quantity of constant frequency power required in the Phase IIA airplane was not favorable to such a system. The selected system uses wing mounted accessory gear boxes, shaft driven from the engine. CSD/generators on the gear boxes generate the 240/416 volt, 400 cycle ac power which is utilized directly by the major loads.