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EVA 7 UNDERWAY



SUBMITTED BY ARTHUR N1ORC - AMSAT A/C #31468

	


	
The second of three spacewalks in nine days by International Space 
Station Commander Michael Lopez-Alegria and Flight Engineer Sunita 
Williams is scheduled for Feb. 4.



*EVA 7*: Feb. 4, 2007

The first parts of the Feb. 4 spacewalk are similar to the Jan. 31 
outing. 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 ratsí 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 EVA 6, is expected to take about 2 hours, 15 minutes.

Next they will stand by 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.

The spacewalkers will then work with the Early Ammonia Servicer (EAS) on 
the P6 Truss. It provided a contingency supply of ammonia for the Early 
Ammonia System. With the permanent system working, it is no longer needed.

During EVA 6, Lopez-Alegria and Williams removed and reconnected one of 
two lines linking the EAS with the old cooling system. On EVA 7 they'll 
work on the second line, preparing for the jettison of the EAS this summer.

Lopez-Alegria will then photograph the inboard end of the P6 starboard 
solar wing, in preparation for its retraction during the STS-117 mission 
in March.

Williams will bring tools and cables to the forward end of the lab, 
where Lopez-Alegria will join her. Together they will work toward 
finishing the 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.

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