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William Atkins
Wednesday, 07 February 2007 00:24
Before this spacewalk (as with the previous two spacewalks), the astronauts will stay inside the Quest airlock overnight at an atmospheric pressure of about 10.2 psi (pounds per square inch)—which is equivalent to air pressure at about 3,000 meters (10,000 feet) elevation on the Earth—to remove nitrogen from their bodies. The process, informally called campout, minimizes the time that they must breathe pure oxygen before a spacewalk to avoid decompression sickness (sometimes called the bends).
The pair of spacewalkers—López-Alegría is designated EV-1 (extravehicular crew member-1) and Williams is named EV-2—will move through the Quest airlock out to the Crew Equipment Transfer Aid (CETA) cart, which contains the Articulating Portable Foot Restraint (APFR). The astronauts will move the CETA cart on rails attached to the main truss. Inside the CETA cart is equipment they need for their mission. The astronauts will move the CETA cart out to the P3/P4 Integrated Truss Structure.
At the P3/P4 Truss, the astronauts will remove two large protective thermal shrouds (protecting the truss from the Sun’s heat) from Bay 18 and Bay 20. Other shrouds have already been removed so that they do not trap heat from the Sun’s rays. The shrouds are no longer needed after the ISS was reoriented so that the Destiny Laboratory Module was positioned in the forward direction of the station’s orbit. Each shroud will be folded and then jettisoned away from the station.
Next, the two spacefarers will deploy two Unpressurized Cargo Carrier Assembly Attachment Systems (UCCASs). The upper face and the lower face of the P3/P4 Truss will each received one UCCAS. A future spacewalk by NASA STS-118 astronauts will attach an External Stowage Platform-3 (ESP-3) cargo carrier to the UCCAS.
Williams will also move to the end of the P5 Truss to remove two launch locks to ready that area for the relocation and installation of the P6 Truss during future construction work by the STS-120 astronauts.
If time allows, López-Alegría and Williams will remove a camera stanchion (a supporting brace for a camera) from the External Stowage Platform 3 and move an auxiliary bag containing contingency (emergency) items near to the airlock.
Additional information about the Expedition 14 mission is found at: http://www.nasa.gov/pdf/156557main_Expedition_14_Press_Kit.pdf.
Live NASA TV of the spacewalk can be found at: http://www.nasa.gov/multimedia/nasatv/index.html.
The configuration of the ISS, as of January 26, 2007, is shown at: http://www.nasa.gov/images/content/168107main_00_shireman_012607.jpg.
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