Editing Mobile Servicing System (section)

==Mobile Base System==
[[File:STS-111 Installation of Mobile Base System.jpg|thumb|right|250px|The Mobile Base System just before Canadarm2 installed it on the Mobile Transporter during [[STS-111]]]]
The Mobile Remote Servicer Base System (MBS) is a base platform for the robotic arms. It was added to the station during [[STS-111]] in June 2002. The platform rests atop the [[Mobile Transporter]]<ref name=nst/> (installed on [[STS-110]], designed by [[Northrop Grumman#Aerospace Systems|Northrop Grumman]] in [[Carpinteria, California]]), which allows it to glide 108 metres down rails on the [[Integrated Truss Structure|station's main truss]].<ref name="mbs">{{cite web|url=https://www.asc-csa.gc.ca/eng/iss/mobile-base/|title=About the Mobile Base System|date=20 June 2018 |publisher=Government of Canada|access-date=January 2, 2023}}</ref> Canadarm2 can relocate by itself, but cannot carry at the same time. Dextre cannot relocate by itself. The MBS gives the two robotic arms the ability to travel to work sites all along the truss structure and to step off onto grapple fixtures along the way. When ''Canadarm2'' and ''Dextre'' are attached to the MBS, they have a combined mass of {{convert|4900|kg|abbr=on}}.<ref name=MSS>{{cite web|url=http://www.nasa.gov/mission_pages/station/structure/elements/mobile-servicing-system.html|title=Mobile Servicing System|first=Mark|last=Garcia|date=22 October 2018|website=NASA}}</ref> Like ''Canadarm2'' it was built by [[MD Robotics]], and it has a minimum service life of 15 years.<ref name="mbs"/><ref>{{cite web|title=A Space-Age Robot|url=https://www.technologyreview.com/2008/03/11/221407/a-space-age-robot/|publisher=MIT Technology Review|access-date=January 2, 2023}}</ref>

The MBS is equipped with four Power Data Grapple Fixtures, one at each of its four top corners. Any of these can be used as a base for the two robots, Canadarm2 and Dextre, as well as any of the payloads that might be held by them. The MBS also has two locations to attach payloads. The first is the [[Payload/Orbital Replacement Unit Accommodations]] (POA). This is a device that looks and functions much like the [[Latching End Effector]]s of Canadarm2. It can be used to park, power and command any payload with a grapple fixture, while keeping Canadarm2 free to do something else. The other attachment location is the [[MBS Common Attachment System]] (MCAS). This is another type of attachment system that is used to host scientific experiments.<ref name="MBS features">{{cite web|url=http://www.space.gc.ca/eng/missions/sts-111/mobile_design_component.asp|title=CSA - STS-111 - Mobile Base System - MBS Design|access-date=2008-03-15|publisher=Canadian Space Agency|archive-date=2008-09-21|archive-url=https://web.archive.org/web/20080921030803/http://www.space.gc.ca/eng/missions/sts-111/mobile_design_component.asp|url-status=dead}}</ref>

The MBS also supports astronauts during [[Extravehicular activity|extravehicular activities]]. It has locations to store tools and equipment, foot-restraints, handrails and safety tether attachment points as well as a camera assembly. If needed, it is even possible for an astronaut to "ride" the MBS while it moves at a top speed of about 1.5 meters per minute.<ref name=nst>
{{cite web | url = http://www.nasa.gov/missions/shuttle/f_slowtrain.html | title = The Slowest and Fastest Train in the Universe | publisher = NASA}}</ref> On either side of the MBS are the Crew and Equipment Translation Aids. These carts ride on the same rails as the MBS. Astronauts ride them manually during EVAs to transport equipment and to facilitate their movements around the station.
{{wide image|ISS Mobile Transporter railway system.jpg|1000px|Canadarm2 riding the Mobile Base System along the Mobile Transporter railway, running the length of the station's main truss}}
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