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Prepares for Next Spacewalk


*Crew Concludes Heat Shield Inspection, Prepares for Next Spacewalk*
12 AUGUST 2007
The STS-118 crew completed todayís focused inspection of Space Shuttle 
Endeavourís heat shield and has turned its attention to Mondayís 
spacewalk. Using the shuttle robotic arm and 50-foot-long Orbiter Boom 
Sensor System (OBSS), the crew collected imagery of five areas on 
Endeavourís underside that may have been damaged during the climb to 
orbit on Aug. 8.

STS-118 Mission Specialists Tracy Caldwell and Barbara Morgan and 
Commander Scott Kelly operated the shuttleís robotic arm. STS-118 Pilot 
Charles Hobaugh and Expedition 15 Flight Engineer Clay Anderson were at 
the controls of the International Space Stationís robotic arm.

The data collected during the inspection will be analyzed by experts and 
engineers at the Mission Control Center in Houston.

Mission Specialists Dave Williams and Rick Mastracchio are preparing for 
their second spacewalk. The preparations include spacesuit and tool 
checkouts. Later today, the crew members will review the excursionís 
timeline before the spacewalkers begin the overnight campout in the 
stationís Quest Airlock.

The spacewalk is scheduled to begin at 11:31 a.m. EDT(1531 UTC) Monday. 
The primary task is the replacement of a faulty control moment gyro in 
the stationís Z1 truss. The station has four gyros that are used to 
control the stationís attitude.

Later today, mission managers are expected to make a decision about a 
possible mission extension to 14 days for STS-118. The decision will be 
based upon the performance of the Station-to-Shuttle Power Transfer 
System, which is designed to allow shuttles to receive power from the 
station during docked operations.
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