NASA NTRS · 20000031615
STS-31: APU Controller Removal
Abstract
The launch April 10 of the STS-31 was scrubbed at T-4 minutes due to a faulty valve in auxiliary power unit (APU) number one. 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. This video shows the removal of the STS-31's auxiliary power unit (APU).
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1990-04-11. STS-31: APU Controller Removal. https://ntrs.nasa.gov/citations/20000031615
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