R2 Instrument Panel

Up to OverHead Panel
Left To Forward  Panel APU/HYD Ready To Start Talkback Indicator APU Auto Shutdown Switch APU Feul Tank Valve Hydraulic Main Pump Switches Right To Rear Panel
Down to Bottom Panel

Three identical, but independent, improved auxiliary power units (APUs; also called IAPUs) provide power for the orbiter hydraulic systems. The APU 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. Each unit weighs approximately 88 pounds and produces 135 horsepower.

 

General

Non-normal Procedures

Normal Procedures

Limitations

Schematic

 

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