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ISS CREW TO CONDUCT BACK TO BACK SPACEWALKS



SUBMITTED BY ARTHUR N1ORC - AMSAT A/C #31468

Station Crew to Conduct Three Back-to-Back Spacewalks

	01.31.07

The first of three spacewalks in nine days by International Space 
Station Commander Michael Lopez-Alegria and Flight Engineer Sunita 
Williams began at 10:14 a.m. EST on Jan. 31.

The three spacewalks, from the Quest airlock in U.S. spacesuits, and a 
Russian spacewalk scheduled for Feb. 22 will be the most ever done by 
station crew members during an increment, said Mike Suffredini, station 
program manager.

ISS014-E-12565 : Mikhail Tyurin with spacesuit Image to right: 
Expedition 14 Flight Engineer Mikhail Tyurin works with an 
Extravehicular Mobility Unit spacesuit in the Quest Airlock of the 
International Space Station. Image credit: NASA

*EVA 6*

+ Read more about EVA 6 
<http://www.nasa.gov/mission_pages/station/expeditions/expedition14/exp14_eva6.html> 


*EVA 7*

The first parts of the Feb. 4 spacewalk are similar to the previous one. 
Lopez-Alegria and Williams begin the tasks of the second spacewalk by 
reconfiguring the second of the two cooling loops serving Destiny from 
the temporary to the permanent system.

At the rats’ nest, Lopez-Alegria will reconfigure the fluid loop 
connections, moving the second pair of the fluid lines of the early 
system from the lab and connecting them back up to the Z1 panel. That 
will help enable reactivation of the early cooling system if it should 
be required.

Williams will reconfigure electrical connections. The job, like the 
similar activity on the first spacewalk, is expected to take about 1 
hour, 45 minutes.

Next they will watch as the ground retracts the aft radiator of the P6. 
After retraction they will install another set of six cable cinches and 
two winch bars to secure the radiator and then install the shroud. 
Again, those tasks should take about 2 hours, 20 minutes.

Lopez-Alegria will then move to the end of PMA-1 to remove a sunshade 
from the Node Multiplexer-Demultiplexer (MDM), a data relay system. The 
area was in the sun during the time the station flew in a previous 
orientation. Now, with the station's orientation putting the lab in the 
direction of travel and its 18-inch window always facing the Earth, the 
sunshade is being removed to keep the MDM from getting too cold.

Lopez-Alegria will remove a single bolt to free the sunshade, then move 
with it a short distance on the PMA-1 and jettison it aft and a little 
to starboard.

Meanwhile, Williams will bring tools and cables to the forward end of 
the lab, where Lopez-Alegria will join her. Together they will finish 
routing and installation of the SSPTS cables.

Get-ahead tasks include photographing a connector on the end of PMA-2. 
Shuttle-station audio communication difficulties have been reported 
during recent shuttle missions. Engineers believe the connector might be 
affected by debris or corrosion.

*EVA 8*

On Feb. 8 Lopez-Alegria and Williams will move from the airlock out to 
Crew Equipment Transfer Aid carts on the rails of the main truss. 
Pushing the cart with their equipment, including a foot restraint, they 
move to the P3 Truss. Their first job is to remove two thermal shrouds 
from a Rotary Joint Motor Controller (RJMC) on P3.

Next they will remove the two large shrouds from P3 Bays 18 and 20. The 
shrouds, larger than king-size bed sheets, provide thermal shading. With 
the station in its present orientation, they are no longer needed. They 
are being removed to avoid trapping heat.

Spacewalkers will work together to fold each into a package a bit 
smaller than an outdoor garbage can and jettison them, aft and slightly 
downward.

The 2-hour, 40-minute shroud task will be followed by deployment of two 
Unpressurized Cargo Carrier Assembly Attachment Systems (UCCAS), one on 
the upper face of the P3 truss and the other on the lower face. The 
hour-long job is in preparation for attachment of a cargo carrier during 
a subsequent shuttle mission.

While Lopez-Alegria works on the second UCCAS, Williams will move out to 
the end of the P5 truss to remove two launch locks to prepare for the 
relocation of the P6 Truss.

Get-ahead tasks include removing a final camera stanchion from External 
Stowage Platform 3 and moving an auxiliary bag containing contingency 
items – among them tie-down tethers, cabling and connector caps. The bag 
will be placed near the airlock before the P6 is moved to the end of the 
port truss.

*Russian Spacewalk*

On Feb. 22, Lopez-Alegria and Tyurin are scheduled to do a spacewalk in 
Russian Orlan suits from the Pirs airlock. They will work on an antenna 
of the Progress 23 unpiloted cargo carrier, docked at the aft port of 
the Zvezda service module.

The antenna did not properly retract when that spacecraft docked in 
October. The spacewalkers will try to secure or remove the antenna to 
avoid its interfering with the undocking of P23 in April.


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