Orbital replacement unit (HST)
On HST some parts were designed from the start as ORUs (and all used captive bolts with a standard 7/16" double height hex head), later when it was decided to avoid returning HST to earth for repair, more systems and modules were designated as ORUs (but these use a wider variety of fasteners).
The electrical system of the International Space Station also has such subsystems that provide power generation, power distribution and energy storage.
- Hubble Space Telescope#Servicing missions and new instruments
- Orbital replacement unit, about the ISS ORUs
- "HST Orbital Replacement Units". Setas-www.larc.nasa.gov. Archived from the original on 2013-02-19. Retrieved 2013-03-27.
- Lockheed Martin Missiles and Space. "Hubble Space Telescope Servicing Mission 3A Media Reference Guide" (PDF). NASA. Retrieved 2010-09-21. Section 2.2.
- "Glenn Leads Sustaining Engineering of Power System Hardware". Spaceflightsystems.grc.nasa.gov. 2008-02-14. Archived from the original on 2012-02-22. Retrieved 2013-03-27.
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