AUXILIARY POWER UNITS - NASA
2000-8-31u2002·u2002AUXILIARY POWER UNITS The auxiliary power unit is a hydrazine-fueled, turbine- driven power unit that generates mechanical shaft power to drive a hydraulic pump that produces pressure for the orbiter's hydraulic system.There are three separate APUs, three hydraulic pumps and three hydraulic systems. Each auxiliary power unit and its fuel system are located in the aft …
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