Spacewalkers to Hook Up Harmony at its New Location

November 16, 2007
Spacewalkers to Hook Up Harmony at its New Location
Expedition 16 Commander Peggy Whitson participates in a spacewalk on Nov. 9, 2007. Credit: NASA

A 6-hour, 40-minute spacewalk by International Space Station Commander Peggy Whitson and Flight Engineer Dan Tani will begin the external outfitting of the Harmony node in its new position in front of the U.S laboratory Destiny.

The spacewalk is scheduled to begin at 5 a.m. EST Tuesday from the U.S. airlock Quest. Whitson, the lead spacewalker, will wear the suit with the red stripes while Tani will be in the suit with the barber-pole stripes.

After leaving the airlock and setting up tools and equipment, Whitson will remove, vent and stow an ammonia jumper, part of a temporary cooling loop. Removing it allows connection of the hookup of the permanent ammonia cooling loop on a fluid tray on the station's exterior.

Tani meanwhile will retrieve a bag of tools left outside on the station during the Nov. 9 spacewalk by Whitson and Flight Engineer Yuri Malenchenko. Then he'll remove two fluid caps to prepare for connection of that permanent cooling loop.

Next he will move on to reconfigure a circuit that was used for a Squib firing unit, a small pyrotechnical device that freed a radiator on the Port 1 truss for its deployment last Thursday.

Much of the spacewalk will be devoted to work with Harmony's Loop A fluid tray. That 300-pound, 18.5-foot tray will be moved from its temporary position on the S0 truss, at the center of the station's main truss, to Harmony, atop the starboard avionics tray.

Tani will join Whitson at S0. They'll release the fluid tray and then move it to Harmony. They'll use a kind of relay technique, one moving ahead and attaching tethers to be ready to receive the tray, then the other moving farther forward to take the next handoff.

Once they reach the installation point they'll bolt down the tray, then hook up its six fluid line connections, two at S0, two at the tray and two in between.

Tani will move to his final task, on the port side of Harmony. There he will mate 11 avionics lines. Whitson, meanwhile, will configure heater cables, then mate electrical umbilicals by hooking up four electrical harnesses linking Pressurized Mating Adapter-2 at the outboard end of Harmony to station power.

The two spacewalkers will do the standard cleanup process, then enter the airlock. The beginning of its repressurization will mark the official end of the spacewalk.

Another spacewalk by Whitson and Tani to complete the exterior hookup of Harmony is scheduled for Nov. 24.

Source: NASA

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BigTone
not rated yet Nov 16, 2007
I can't forgive NASA for retiring the Saturn V, they should have just kept improving it. All these other lifters are just BS... NASA complains about their budget, I think they owe us an explanation about why they retired a rocket that never killed any astronauts and would allow for more flexibility in the number of missions, duration, and destination to accomplish almost any effort. The smaller rockets are really just for probes that have very specific orbital trajectories and bombing each other... Can someone from NASA give us some answers about their most retarded decision ever? They better not say "cost" because those numbers are never going to add up if you subtract the number of total launches that would have been required since the 60's both foreign and domestic - plus the cost of developing and these new lifters that can't even come close to the payload capability of the Saturn V
gopher65
1 / 5 (1) Nov 16, 2007
Big Tone: Because anti-science Republican President Nixon cancelled the Saturn V, that's why. It was completely out of NASA's hands.
Feuerbls07
not rated yet Nov 17, 2007
@Big Tone: They DID keep improving it; the Ares V rocket/launch vehicle is an improved Saturn V, with technologies also taken from the Space Shuttle's solid rocket boosters. See the second image on http://www.nasa.g...207.html entitled Building on a Foundation of Proven Technologies.
Derat
not rated yet Nov 19, 2007
This is to gopher65... Only Congress controls the purse strings. It's not up to the President which programs get funded. He can ask, but ultimately, Congress is the one who creates the budget. Take a look at the precipitous drop off in NASAs budget the 60s and dropping to less than half. http://en.wikiped...A_Budget

It was the Democrat controlled congress which cut the budget... not Nixon. So quit trying to gain some political points by lying about republicans. Republicans are not anti-science... just like Democrats are not all anti-American.

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