2002
Report # 23 
4 p.m. CDT, Friday, May 10, 2002 
Expedition Four Crew 

Expedition 4 Commander Yury Onufrienko and Flight Engineers Carl Walz and
Dan Bursch spent most of their time this week packing for the arrival of
the Expedition 5 crew aboard STS-111. Endeavour will be carrying the
Leonardo Multi-Purpose Logistics Module filled with supplies and
equipment for the Expedition 5 crew. The Expedition 4 crew is working to
make room for those supplies, as well as prepare any equipment and
scientific results that will be brought home with them aboard Leonardo.

The Expedition 4 crew began their week by having Sunday, Monday and half
of Tuesday off after playing host to three visitors for more than eight
days. The multinational Soyuz Taxi crew left the International Space
Station Saturday, May 4, having delivered a fresh Soyuz crew return
vehicle to the outpost.

Onufrienko, Walz and Bursch also worked with the Zeolite Crystal Growth
experiment and the Biomass Production System, a plant growth experiment
that is the second such experiment for the Expedition 4 crew. 

Russian ground controllers continue to work with Onufrienko to
troubleshoot the Elektron oxygen generating system in the Zvezda Service
Module, which has been working off and on for most of the last week. The
Elektron, which breaks down water into hydrogen and breathable oxygen, is
off. When necessary, the crew has been burning chemical candles that
release oxygen and have resupplied the ISS with oxygen from the Progress
supply tanks. Although they do not plan to use it, the crew has an
additional supply of oxygen in the high-pressure gas tanks attached to
the station’s Quest airlock. The Elektron problem has had no impact on
station operations.

Information on the crew’s activities aboard the space station, future
launch dates, as well as station sighting opportunities from anywhere on
the Earth, is available on the Internet at:

http://spaceflight.nasa.gov

Details on station science operations can be found on an Internet site
administered by the Payload Operations Center at NASA's Marshall Space
Flight Center in Huntsville, Ala., at:

http://www.scipoc.msfc.nasa.gov

The next ISS status report will be issued on Friday, May 17, or earlier
if developments warrant.

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