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Fw: NASA HSF News Digest V1 #19



Submitted by Arthur - N1ORC


In this issue:

	STS-109 Mission Status Report #11
	STS-109 Mission Status Report #12

Date: Tue, 5 Mar 2002 21:23:34 -0600 (CST)
From: info@jsc.nasa.gov
Subject: STS-109 Mission Status Report #11


 Tuesday, March 5, 2002 - 9:30 p.m. CST 
 
 Columbia's crew is preparing tonight for the third space walk of the
mission, a complex, seven-hour excursion that will include the
unprecedented step of turning off the Hubble Space Telescope to replace
the heart of its power system.

Controllers at the Space Telescope Operations Control Center in
Greenbelt, MD, will begin sending commands to power down the telescope's
systems around 10:30 p.m. CST. The power is planned to be off until the
telescope is brought back to life at 5:30 a.m. CST Wednesday with a newly
installed power center.

The shuttle crew was awakened today by the song “Carmen Ohio,” performed
by the Ohio State University marching band and played for Ohio State
alumni Nancy Currie and Rick Linnehan aboard Columbia. Space walkers John
Grunsfeld and Linnehan are scheduled to begin their work outside the
shuttle about 12:30 a.m. CST Wednesday. 

Grunsfeld and Linnehan will replace Hubble's power control unit, or PCU,
the central power switching station that distributes electricity to all
of the observatory's systems and scientific instruments. Currie will
operate the shuttle’s robotic arm, moving the space walkers to and from
worksites on the telescope. Linnehan will ride the arm first to a
position where he will disconnect the telescope's batteries. Meanwhile,
Grunsfeld will install blankets to protect components that will not be
heated while the power is off.

The pair will work in tandem to replace the PCU.  Linnehan will remove 30
of the 36 connectors on the old PCU and then move to the shuttle's
payload bay to prepare the new unit for installation. Grunsfeld will then
work at the end of the arm to unhook the remaining connectors, ease the
old PCU out of the telescope and carry it to the shuttle's payload bay to
be stored. There, Linnehan will hand the new unit to Grunsfeld, who will
take it to the worksite, install the new box in its bay and reattach the
36 connectors.

Inside Columbia, the flight's other space walking team, Jim Newman and
Mike Massimino, will assist. They will act as in-cabin choreographers
guiding Grunsfeld and Linnehan through their tasks. Newman and Massimino
are scheduled to perform the mission's fourth space walk on Thursday.
Columbia Commander Scott Altman and Pilot Duane Carey will operate
television and still cameras to document the work.

The crew is to begin its sleep period at 11:52 a.m. CST Wednesday.  The
next STS-109 mission status report will be issued Wednesday morning, or
as events warrant.




STS-109
Report # 12 
 Wednesday, March 6, 2002 – 3:00 p.m. CST 
 
 The Hubble Space Telescope received a new “heart” today during a 6 hour,
48 minute spacewalk by astronauts John Grunsfeld and Rick Linnehan.  The
two installed a new Power Control Unit (PCU), replacing the original unit
launched with the telescope in April 1990.  The PCU serves as Hubble’s
central power switching station by distributing electricity to all
systems, scientific instruments and the Nickel Hydrogen batteries.

In addition to eliminating an intermittent problem with the old PCU, the
new unit also is capable of handling the extra 20 percent of power output
being generated from Hubble’s newly installed set of solar panels
attached during back-to-back space walks Monday and Tuesday.  Controllers
at the Space Telescope Operations Control Center in Greenbelt, MD,
powered Hubble down at 3:37 a.m. Wednesday for the first time since its
launch in 1990.

Mission Specialist Nancy Currie operated the shuttle’s robotic arm
throughout the space walk, moving Grunsfeld and Linnehan to and from
various worksites on the telescope and in Columbia’s payload bay. 
Grunsfeld later told Mission Control that, “Nancy is my hero” for her
work today.

Today’s space walk started two hours late due to a water leak in
Grunsfeld’s spacesuit.  After swapping the upper portion of his suit the
space walk began at 2:28 a.m.  Linnehan, working from the shuttle’s
robotic arm, began by removing 30 of the 36 connectors on the old PCU. 
He was then maneuvered by Currie to the shuttle's payload bay where he
switched places with Grunsfeld in order to prepare the new PCU for
installation.  At 4:55 a.m. Grunsfeld, now working from the robotic arm,
unhooked the remaining six PCU connectors, eased the old PCU out of the
telescope and carried it to the shuttle's payload bay for return to
Earth.  Grunsfeld installed the new unit at 5:53 a.m.  The connectors
were mated to the new PCU by 7:19 a.m.  Shortly thereafter, the new PCU
passed its aliveness test at 8:02 a.m. and all functional tests were
completed at 12:18 p.m.

Inside Columbia, the flight's other space walking team, Jim Newman and
Mike Massimino looked toward the fourth space walk set to begin tomorrow
at about 2:30 a.m. CST to replace the last of Hubble’s original science
instruments – the Faint Object Camera – with the Advanced Camera for
Surveys.

The crew is scheduled to awaken at 9:52 p.m. CST Wednesday. The next
STS-109 mission status report will be issued Wednesday evening, or as
events warrant.






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