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Space Shuttle Orbiter auxiliary power unit statusAn overview of the United States Space Shuttle Orbiter APU, which provides power to the Orbiter vehicle hydraulic system, is presented. Three complete APU systems, each with its own separate fuel system, supply power to three dedicated hydraulic systems. These in turn provide power to all Orbiter vehicle critical flight functions including launch, orbit, reentry, and landing. The basic APU logic diagram is presented. The APU includes a hydrazine-powered turbine that drives a hydraulic pump and various accessories through a high-speed gearbox. The APU also features a sophisticated thermal management system designed to ensure safe and reliable operation in the various launch, orbit, reentry, and landing environments.
Document ID
19920062818
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Reck, M.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Loken, G.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Horton, J.
(NASA Lyndon B. Johnson Space Center Houston, TX, United States)
Lukens, W.
(Sundstrand Aerospace Rockford, IL, United States)
Scott, W.
(NASA Johnson Space Center Houston, TX, United States)
Baughman, J.
(Rockwell International Corp. Downey, CA, United States)
Bauch, T.
(STS Corp. Tokyo, Japan)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
SAE PAPER 912060
Meeting Information
Meeting: International Pacific Air and Space Technology Conference
Location: Gifu
Country: Japan
Start Date: October 7, 1991
End Date: October 11, 1991
Accession Number
92A45442
Distribution Limits
Public
Copyright
Other

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