[sarex] NEXT EVA 7 - FEBRUARY 4, 2007

[Arthur Rowe]

SUBMITTED BY ARTHUR N1ORC - AMSAT A/C #31468

*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.