[sarex] STS-115 MCC Status Report #12
azrowe80 at verizon.net
Fri Sep 15 01:39:35 PDT 2006
SUBMITTED BY ARTHUR N1ORC - AMSAT A/C #31468
Mission Control Center, Houston, Texas
STATUS REPORT: STS-115-12
STS-115 MCC Status Report #12
The Atlantis and International Space Station crews today will focus on
the third and final spacewalk of the mission.
The STS-115 crew, Commander Brent Jett, Pilot Chris Ferguson and Mission
Specialists Dan Burbank, Joe Tanner, Heide Stefanyshyn-Piper and Steve
MacLean, is in its fourth day of joint operations with the station crew.
Their Expedition 13 counterparts, Commander Pavel Vinogradov and Flight
Engineers Jeff Williams and Thomas Reiter, will support the spacewalk
activities as well as continued space station operations and maintenance.
Both crews awoke at 11:15 p.m. CDT to "Hotel California" performed by
the Eagles and played for Tanner.
Tanner and Stefanyshyn-Piper will team up again for the spacewalk. While
they were in the Quest airlock preparing for the spacewalk, a
circuit-breaker-like remote power controller (RPC) tripped, causing loss
of power to the airlock's depressurization pump. While flight
controllers and engineers assessed the cause of the problem, the
spacewalkers moved to the adjacent Unity module, while continuing to
breathe oxygen through masks per their pre-spacewalk protocol.
The trip of the RPC was apparently due to a momentary spike in the
electrical current of the depressurization pump. After assessing data to
ensure the system had no short circuit, the breaker was reset and pump
reactivated. Tanner and Stefanyshyn-Piper are scheduled to leave the
Quest airlock at about 4:15 a.m. Once the spacewalk begins, the two will
split up to perform the scheduled tasks for the spacewalk.
Tanner will install bolt retainers on the P6 Beta Gimbal Assembly, which
helps to orient the pitch of the solar array wings. He’ll also use a new
technique to attempt to re-engage a four-bar hinge lock that did not
properly engage during STS-97.
Meanwhile, Stefanyshyn-Piper will retrieve the Materials on the
International Space Station Experiment 5. The materials science
experiment tests the effects of the space environment on prospective
The two will then prepare the photovoltaic radiator for deployment by
removing launch hardware that was in place to protect it during the
shuttle launch. Once that is done, other crewmembers can deploy that
heat-dissipating radiator. Next the spacewalkers will replace an S-band
antenna support assembly (SASA) on the Starboard 1 (S1) truss. They’ll
also install a shroud on the failed SASA, which will be returned to
Earth on a later mission.
Dividing again, Stefanyshyn-Piper will replace a baseband signal
processor and transponder on S1 and Tanner will install a heat shield
onto an antenna group interface tube to help overheating in this area
during certain vehicle attitudes.
They’ll wrap up the spacewalk with two new tasks, installing a new
external wireless television antenna and performing a Detailed Test
Objective to assess infrared video of the wing leading edge. The
spacewalk is scheduled to last 6.5 hours.
Once the spacewalk is completed, the mobile transporter, a movable
platform that moves along the truss segments, will be relocated to a
position on the newly arrived P3 truss to check out that worksite.
The next STS-115 mission status report will be issued Friday afternoon,
or earlier if events warrant.
More information about the SAREX