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STS-108, Mission Control Center
Status Report # 17
Thursday, December 13, 2001 - 6 p.m. CST
The crews of Endeavour
and the International Space Station continued packing the Italian-built
Raffaello cargo module and the shuttle for the trip home today as the
new station crew began to settle in aboard the complex for a five and
a half-month stay.
The crew has already
unloaded almost three tons of station food, clothes, experiments and
other gear that was launched aboard Endeavour and Raffaello. Early today,
the crews had also completed more than 70 percent of the repacking of
Raffaello for the trip home, loading the cargo module with trash and
gear from the offgoing station crew's mission such as individualized
Soyuz space suits and seat liners.
The 10 astronauts
and cosmonauts aboard the shuttle-station complex gathered this afternoon
in the station's Destiny Laboratory for a formal change of command ceremony
as Expedition Three ends and Expedition Four begins. The new crew officially
took over duties aboard the station on Saturday. Expedition Three --
Commander Frank Culbertson, Pilot Vladimir Dezhurov and Flight Engineer
Mikhail Tyurin -- spent 117 days as the station crew. Expedition Four
-- Commander Yury Onufrienko and Flight Engineers Dan Bursch and Carl
Walz -- will remain aboard the complex until May 2002.
On Friday, the
crews will close the hatch on Raffaello and Endeavour Pilot Mark Kelly
will use the shuttle's robotic arm to detach it from the station and
lower it back into the shuttle's payload bay to be brought back to Earth.
The crews also will continue maintenance work on the station, replacing
a faulty air conditioner compressor. Endeavour will undock from the
station on Saturday.
Endeavour and the
International Space Station remain in good shape, orbiting at an average
altitude of 241 statute miles. Last night, the crew and Mission Control
noted a transient problem with one of the shuttle's three inertial measurement
units (IMUs), the primary navigation units for the shuttle. Only two
of the three IMUs were on line at the time, with the third unit off
line to save electricity. The IMU that experienced a problem, designated
IMU 2, was immediately taken off line and the third IMU brought on line.
IMU 2 has operated well since then, but it has remained off line and
is considered failed by flight controllers. The loss of one IMU has
no impact on Endeavour's mission, and the other two units are operating
in excellent condition. Endeavour
could operate well on only one IMU if needed.
Endeavour's crew
will begin a sleep period at 9:19 p.m. CST today and awaken at 5:19
a.m. CST on Friday. The next Mission Status Report will be issued at
6 a.m. CST Friday or as events warrant.
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