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STS-111 REPORT #8



Submitted by Arthur - N1ORC

STS-111, Mission Control Center 
Status Report # 08
Saturday, June 8, 2002 – 8 p.m. CDT

The 10-member multinational crew aboard the International Space Station
and shuttle complex worked today to move the Leonardo transfer van from
the shuttle’s payload bay to the station, begin equipment and supply
transfers to the station and prepare for Sunday’s space walk. 

The Leonardo Multi-Purpose Logistics Module (MPLM) was unberthed from the
payload bay early this morning by Commander Ken Cockrell operating the
shuttle’s robotic arm to move the module to the station’s Unity module.
Leonardo’s installation proceeded perfectly with completion at 9:28 a.m.
Central time. About 4:30 p.m. Central time, the MPLM’s hatch was opened.
Dan Bursch of Expedition Four called down at 4:52 pm that all crew
members had entered the logistics module and were working to get the
transfers rolling. The crew got a good start on the movement of more than
5,600 pounds of cargo to the station. 

Early today, one of four control moment gyroscopes used in the station’s
attitude control system experienced a mechanical failure. Flight
controllers turned it off and began using the remaining three gyros to
maintain the station’s attitude. It is believed that one of its spin
bearings failed, causing it to seize. Flight Engineer Carl Walz reported
that the crew could feel and hear “growling” vibrations as it failed.
While the failure is a serious complication for the long-term space
station operations, there are multiple backup systems for control of the
station’s attitude so it poses no threat to the safety of the shuttle or
expedition crews. The situation is expected to require only minor changes
to the STS-111 flight activities. 

Franklin Chang-Diaz, and Perrin, with help from Paul Lockhart, readied
their extravehicular mobility unit space suits and tools, and reviewed
procedures for Sunday’s spacewalk. The two first-time spacewalkers will
install a Power and Data Grapple Fixture (PDGF) to the station’s P6 solar
array truss and temporarily store some Russian meteoroid/debris shields.
They’ll also remove thermal blankets from the Mobile Base System (MBS) in
Endeavour’s cargo bay, and support its unberthing. The MBS will be parked
on the shuttle’s arm near its installation point so that hardware
temperatures can equalize before it is attached to the existing Mobile
Transporter platform. At the end of the day, flight controllers will
activate the MBS from the ground in preparation for the next day’s
operations. Chang-Diaz also will inspect and photograph the exterior
condition of station’s failed control moment gryoscope at the end of his
spacewalk. 

The combined STS-111 crew of Cockrell, Lockhart, Chang-Diaz, Perrin, Yury
Onufrienko, Dan Bursch and Carl Walz will wake up at 4:23 am CDT Sunday,
while new station Commander Valery Korzun and Flight Engineers Peggy
Whitson and Sergei Treschev will arise at 4:53 am. 

The next STS-111 mission status report will be issued Sunday morning, or
earlier, if events warrant.

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