STS-100 Day 10 Highlights
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- On Saturday, April 27, 2001, 6:30 a.m. CDT, STS-100 MCC Status Report # 19
reports:
- The primary computer aboard the International Space Station
continued to work well through the night, but flight controllers
continued to encounter difficulties recovering the station's backup
computers.
- The station's two backup command and control computers remain off
line. Attempts overnight to reload software in one of the computers
were not successful. Analysts on the ground have uncovered an error in
the software load that they believe may have been the source of the
problem. Further efforts to reload software into the backup computers
are expected to resume later this morning.
- Even if backup computers are not yet on line, the crew may be given
a go today to use the station's robotic arm in an abbreviated maneuver
to hand a carrier pallet to Endeavour's arm so that it may be stowed
aboard the shuttle for a return to Earth. If so, the joint robotic
activities would begin no earlier than 8 a.m. to allow time for
managers to thoroughly evaluate the plan.
- Meanwhile, the crews are using the shuttle's robotic arm and cameras
and the station's cameras to calibrate the Space Vision System, a
precision alignment aid for operators of the robotic arm, and gather
information that will help prepare for the next shuttle mission to
visit the station. On that flight, planned for launch in June, the
Space Vision System will be a key aid for using the station arm to
attach a new airlock to the station. The crew also is continuing the
transfer of equipment from the shuttle to the station during the day,
and may work on some station maintenance tasks. A joint crew press
conference, during which the 10 astronauts and cosmonauts will field
questions from U.S., Canadian and European media, is planned at 1:41
p.m. CDT.
- Shortly after Endeavour's crew awoke today, Mission Control reported
to them the successful launch of a replacement Soyuz spacecraft bound
for the station from the Baikonur Cosmodrome in Kazakstan. The Soyuz,
with a taxi crew of Commander Talgat A. Musabaev, Flight Engineer Yuri
M. Baturin and American businessman Dennis Tito, will replace the
Soyuz spacecraft now attached to the station, which is nearing the end
of its lifetime as a station emergency "lifeboat." The new Soyuz is
tentatively planned to dock with the station at 3:05 a.m. CDT Monday,
however the Soyuz docking plans will be delayed if a decision is made
to further extend Endeavour's stay at the station.
- The shuttle crew was awakened today to the song "Dangerous," sung by
C'est Cheese, played for Canadian Astronaut Chris Hadfield at the
request of his wife. The station and shuttle are in an orbit of about
250 by 235 statute miles.
- On Saturday, April 27, 2001, 8:30 p.m. CDT, STS-100 MCC Status Report # 20
reports:
- Canadian "handshake in space" occurred at 4:02 p.m Central time
today, as the Canadian-built space station robotic arm - operated by
Expedition Two crew member Susan Helms - transferred its launch cradle
over to Endeavour's robotic arm, with Canadian Space Agency astronaut
Chris Hadfield at the controls. The exchange of the pallet from
station arm to shuttle arm marked the first ever robotic-to-robotic
transfer in space.
- The successful exchange of the pallet was the last remaining major
objective of the mission to be accomplished and could pave the way for
Endeavour to undock from the station Sunday morning, if computers on
board can be placed in a stable configuration overnight. Mission
managers had established three specific criteria to be met prior to
Endeavour's undocking. The criteria were to reberth the cradle pallet
in the shuttle's payload bay, complete final transfer activities and
place the station's command and control (C&C) computers in a stable
configuration. With the pallet securely in Endeavour's payload bay
and all final transfer items in place, the one remaining item is to
ensure the computer system is in a stable configuration prior to
Endeavour's departure. Overnight, flight controllers will uplink a
series of commands designed to restore the two computers to full
capability. C&C three is in an acceptable condition, although it is
known to have a bad hard drive. Helms and crew mate Jim Voss will
perform repair work on that computer at a later date.
- A final decision whether to undock Endeavour - and delay the docking
of the Soyuz replacement vehicle - is expected late tonight or early
Sunday morning. After spending much of this morning refining
procedures to minimize inputs to the station's primary command and
control computer, which developed problems accessing its hard drive,
Space Station Flight Director Mark Ferring gave the Expedition Two
crew a "go" to begin with arm operations at 1:27 p.m. With Helms
working at the robotic work station, first motion of the station arm
occurred at 3:01 p.m. Through a series of carefully choreographed
commands, the station arm was maneuvered into its handoff
position. Hadfield then slowly moved Endeavour's 50-foot long robot
arm into position to latch onto the cradle, which was securely
attached to the station arm at 3:43 p.m. At 4:02 p.m., as the two
spacecraft flew over British Columbia, the pallet changed hands.
- Both arms then began backing away - with the station arm now under
command of Voss, according to plan. Hadfield then stowed the pallet in
Endeavour's payload bay at 4:51 p.m.
- Earlier in the day, Voss informed flight controllers that Endeavour
crew members were helping with maintenance activities on the station's
treadmill, called TVIS, installing new hardware to allow the
Expedition crew to once again use it for exercise. The treadmill's
walking surface had degraded and the crew had been told not to use it
until repairs were made. Voss reports repairs are now about 50 per
cent complete.
- After enjoying a meal together, both crews were scheduled to go to
sleep shortly after 7 p.m. Both crews will enjoy an extra hour of
sleep, waking up just before 4 a.m. Due to a compressed schedule
tomorrow, the in-flight crew news conference, originally scheduled for
6:15 a.m. Sunday, has been canceled.
- If a decision is made to undock tomorrow, the astronauts and
cosmonauts will exchange final farewells about 9:30 a.m. and then
begin closing the hatches between the two spacecraft. Undocking would
occur at 12:34 p.m. central. Pilot Jeff Ashby would then slowly back
Endeavour away to a distance of approximately 450 feet, where he will
begin a three-quarter circle flyaround of the station before
commanding a final separation burn signaling Endeavour's final
departure from the station. With an undocking Sunday, the mission is
scheduled to conclude with a landing at the Kennedy Space Center.at
8:04 a.m. Central time Tuesday.
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