[sarex] Installed New Station CMG
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Mon Aug 13 16:55:53 PDT 2007
SUBMITTED BY ARTHUR N1ORC - AMSAT A/C #31468
*Mastracchio, Williams Install New Station CMG *
Rick Mastracchio removes failed CMGImage above: Astronaut Rick
Mastracchio holds the failed control moment gyro shortly after its
removal from the Z1 truss. Image: NASA TV
TO VIEW IMAGE GO
STS-118’s second spacewalk is now in the history books. Mission
Specialists Dave Williams and Rick Mastracchio successfully installed a
new control moment gyroscope (CMG) onto the International Space
Station’s Z1 truss during the excursion, which ended at 6 p.m. EDT.
The new CMG replaces a faulty gyroscope, which was removed during the
first half of the spacewalk. The new gyroscope is one of four CMGs that
are used to control the station’s attitude in orbit.
Before concluding the 6-hour, 28-minute excursion, the orbital duo
relocated the faulty CMG to external stowage platform-2, where it will
stay until it is returned to Earth on a future shuttle mission.
Mission Specialist Tracy Caldwell served as the spacewalk coordinator,
and STS-118 Pilot Charles Hobaugh and Expedition 15 Flight Engineer Clay
Anderson operated the station’s robotic arm.
The next spacewalk is scheduled to take place Wednesday. Mastracchio and
Anderson will team up to prepare the station’s Port 6 truss for
relocation during STS-120. A fourth spacewalk was added to the schedule
when STS-118 was extended by three days.
In other activities, crew members continued cargo transfers between
Endeavour and the station. Experts on the ground continued to analyze
imagery collected Sunday during the STS-118 crew’s focused inspection of
five areas of concern on the Endeavour’s heat shield.
More information about the SAREX