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NASA Sets Briefing To Preview Updated Space Station Spacewalk Plan






HOUSTON -- NASA managers will discuss updated plans for two
International Space Station spacewalks during a news briefing at 3
p.m. CDT on Monday, Aug. 2. The briefing replaces one originally
scheduled for Tuesday.

The news conference from NASA's Johnson Space Center in Houston will
air live on NASA Television and the agency's website. Journalists may
ask questions from participating NASA locations.

The briefers are:
- Michael Suffredini, manager, International Space Station Program
- Courtenay McMillan, Expedition 24 spacewalk flight director

Expedition 24 Flight Engineers Doug Wheelock and Tracy Caldwell Dyson
are scheduled to perform two spacewalks. The two NASA astronauts will
replace an ammonia coolant pump that failed July 31.

Engineers and flight controllers continue to review data on the
failure, which resulted in the loss of one of two cooling loops
aboard the station. This caused a significant power down and required
adjustments to provide the maximum redundancy possible for station
systems. The systems are stable, and the six crew members aboard are
not in any danger.

Wheelock and Caldwell Dyson originally were scheduled to perform a
spacewalk to outfit the Russian Zarya module for future robotics work
and prepare the station for the installation of a new U.S. permanent
multipurpose module. However, because of the importance of restoring
redundancy to the station's cooling and power systems, Thursday's
spacewalk will be dedicated to the pump module replacement. Another
spacewalk will be scheduled a few days later to complete the repairs.

NASA TV coverage of the 15th U.S. spacewalk from the station will
begin at 5 a.m. on Thursday, Aug. 5. Wheelock and Caldwell Dyson are
expected to begin the spacewalk from the Quest airlock at 5:55 a.m.
It will be Wheelock's fourth spacewalk and Caldwell Dyson's first.

For NASA TV streaming video, schedules and downlink information, visit:

http://www.nasa.gov/ntv

For more information about the station and the Expedition 24 crew, visit:

http://www.nasa.gov/station

Source: NASA




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