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The [URL=http://www.nasa.gov/mission_pages/shuttle/launch/rotating-service-structure.html]rotating service structure[/URL] is 102 feet long, 50 feet wide, and 130 feet high. It is supported by a rotating bridge that pivots about a vertical axis on the west side of the pad's flame trench. The structure rotates through 120 degrees -- one third of a circle -- on a radius of 160 feet. Its hinged column rests on the pad surface and is braced against the fixed service structure.
The major feature of the rotating service structure is the Payload Changeout Room, an enclosed, environmentally controlled area that supports payload delivery and servicing at the pad and mates to the orbiter cargo bay for vertical payload installation.
Another feature of the rotating service structure is the orbiter midbody umbilical unit, which provides access and services to the midfuselage portion of the orbiter. The unit is 22 feet long, 13 feet wide, and 20 feet high. It extends from the rotating structure at levels ranging from 158 feet to 176 feet above the pad surface. The unit provides access to the midbody umbilical door.
Also found on the rotating service structure is the hypergolic umbilical system. Hypergolic fuel and oxidizer lines, as well as helium and nitrogen service lines, are carried from the fixed service structure to the space shuttle orbital maneuvering system pods via this umbilical system.
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