1984•NASA Technical Reports Server (NASA)Requires access
Space Shuttle Orbiter improved auxiliary power unit
D. W. Hagemann, L. Wicklund, G. R. Loken, J. R. Baughman, R. J. Lance
Open publisher page 0 citations
Abstract
The Space Shuttle Orbiter Auxiliary Power Unit subsystem has operated successfully on three vehicles by meeting mission requirements and has proven the design for space operation. The current Auxiliary Power Unit (APU) operational life is limited to 12 missions and the APU turnaround between flights is longer than originally anticipated. The Improved APU objective is to increase life to 50 missions, reduce the three - APU subsystem vehicle weight by 140 lbs., and reduce turnaround time. The design changes incorporated into the Improved APU and the associated development testing are described.