 |
|
|
| Related
material for Flight Day - REPLACE
POWER UNIT
|
Goddard Space Flight Center
The Hubble Space Telescope Project
Hubble Status Report
 Wed
| Mar. 6, 2002 - 1:45 pm EST
The HST Mission Operations Manager has reported that the Space
Telescope Operations Control Center (STOCC) has completed
over 14 hours of power-on, reconfiguration, and checkout of
the Hubble Space Telescope following its complete power-down
earlier today.
All HST temperatures have returned to nominal levels. The
new Solar Arrays, Diode Box Assemblies, and Power Control
Unit have all passed their aliveness and functional tests.
The Pointing Control System hardware was successfully powered
on and is performing within specification, including the newly-installed
Reaction Wheel Assembly #1.
The new Solar Arrays have been successfully slewed to demonstrate
they are capable of moving to optimal sun angles during normal
operations.
The Science Instruments and Data Handling Computer were successfully
recovered from their respective "safe modes". The Faint Object
Camera (FOC) remains in "safe mode" for warm-up prior to replacement
with the Advanced Camera for Surveys (ACS). All-in-all it
has been a tremendously busy and successfully day, following
an amazing effort by all during EVA3.
Goddard
Space Flight Center
The Hubble Space Telescope Project
Hubble Status Report
 Wed
| Mar. 6, 2002 - 1:45 pm EST
The new Power Control Unit (PCU) installed during EVA3 has
now passed its lengthy Functional Test with flying colors.
The new PCU, in combination with the new Solar Arrays, provide
a major upgrade to the reliability and output of the HST power
system and ensures it will support the needs of the full-complement
of science instruments, as they are upgraded in this and the
next Servicing Mission.
The HST gyros have now also been powered back on successfully
(except for gyro 5 which remains failed, as expected). The
current Science Instruments are now all receiving power in
their standard "safe modes" and will shortly be
brought up to various low-level operate or hold modes. All
continues to go extremely well. CLICK
HERE FOR VIDEO CLIPS OF THE EVA...
Johnson
Space Center
Space News :: Latest Items
 Wed
| Mar. 6, 2002 - 10:42 am EST
Spacewalkers John Grunsfeld and Rick Linnehan are back on
board Columbia after concluding a 6 hour 48 minute EVA to
install a new power unit in the Hubble Space Telescope.
This third spacewalk of the STS-109 mission began at 2:28
a.m. central time and concluded at 9:16 a.m.
A fourth spacewalk will be conducted tomorrow by Jim Newman
and Mike Massimino to install a new camera in the orbiting
telescope, the Advanced Camera for Surveys.
The crew will begin an abbreviated 7 1/2 hour sleep period
just before 2:30 p.m. central time. CLICK
HERE FOR AUDIO ABOUT HOW THE EVA WENT...
Goddard
Space Flight Center
The Hubble Space Telescope Project
Hubble Status Report
 Wed
| Mar. 6, 2002 - 9:57 am EST
Following its successful installation on HST by astronauts
John Grunsfeld and Richard Linnehan, the replacement Power
Control Unit (PCU) passed its Aliveness Test. The Functional
Test is about to begin.
Johnson Space Center
Space News :: Latest Items
 Wed
| Mar. 6, 2002 - 9:45 am EST
About 5 1/2 hours into today's spacewalk to install a new
power control unit, the Hubble Space Telescope's heartbeat
was restored at 8:02 a.m. central time.
That heartbeat indicated that telemetry from the telescope
was being received on the ground, allowing commands to be
sent to the Hubble.
At 8:41 a.m. ground controllers at the Space Telescope Operations
Control Center confirmed that aliveness tests of the new power
control unit were successful. They will now begin the lengthy
process of restoring power to each of the Hubble's various
components.
Today's spacewalk, which began at 2:28 a.m., is being conducted
by John Grunsfeld and Rick Linnehan. Grunsfeld and Linnehan
also conducted the first of five scheduled spacewalks for
this mission.
Tomorrow, astronauts Mike Massimino and Jim Newman will conduct
the fourth spacewalk of this mission to install a new camera,
the Advanced Camera for Surveys, in the orbiting observatory.
Wed
| Mar. 6, 2002 - 9:02 am EST
PCU has been changed-out. Telemetry has been restored and
once again Hubble has a "heartbeat". Aliveness tests
have been so far successful.
Wed
| Mar. 6, 2002 - 4:55 am EST
PCU powerdown complete. Astronauts Grunsfeld and Linnehan
will begin removing the PCU'S connectors, so that it can be
removed. A new one will take its place.
Wed
| Mar. 6, 2002 - 3:39 am EST
Wednesday's spacewalk by John Grunsfeld and Richard Linnehan
began at 2:28 a.m. CST, after a delay caused by a water leak
in Grunsfeld's suit. The astronauts will replace the Hubble
Space Telescope's Power Control Unit during the spacewalk,
the third of five during the STS-109 mission to upgrade the
orbiting observatory. CLICK
HERE FOR MORE IMAGES...
 Wed
| Mar. 6, 2002 - 2:04 am EST
A water leak in John Grunsfeld's spacesuit has delayed the
start of this morning's spacewalk. Grunsfeld will use another
spacesuit, which is being resized to fit him. The spacewalk
is expected to begin about 2:30 a.m. CST. Grunsfeld and fellow
spacewalker Richard Linnehan will change out the Power Control
Unit of the Hubble Space Telescope.
Controllers at the Space Telescope Operations Control Center
in Green Belt, Md., will power down Hubble for the first time
ever to enable Grunsfeld and Linnehan to replace the PCU.
Hubble will be powered back up after the new PCU is installed.
| More
material about this mission day
|
|
|
|
|
|
>
Click
here for Still Images.
