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From: starrfie@hydro.la.asu.edu (Sumner Starrfield)
Subject: Great News (fwd)
Date: Thu, 9 Dec 93 8:07:19 MST
Forwarded message:
>From wms@stsci.edu Thu Dec 9 05:56:35 1993
Date: Thu, 9 Dec 93 08:03:17 EST
From: Robert Williams <wms@stsci.edu>
Message-ID: <vsnet-history1883@hoge.baba.hajime.jp>
To: starrfie@hydro.la.asu.edu
Subject: Great News
>From DOXSEY@avion.stsci.edu Thu Dec 9 07:14:25 1993
Subject: Ok !! HST ready to go !!
To: wms@stsci.edu, elt@astrovax.princeton.edu, grepass@gsfcmail.nasa.gov,
jnb@sns.ias.edu, GILLIL@stsci.edu, sparks@stsci.edu, weaver@stsci.edu,
mcgrath@stsci.edu, storrs@stsci.edu, ~saha@avion.stsci.edu,
mackenty@stsci.edu, ~library@avion.stsci.edu, rjallen@stsci.edu,
LONG@stsci.edu, sbaum@stsci.edu, ford@stsci.edu, SESD@avion.stsci.edu
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SM Report #8
7:00 AM December 9 343:12:00
Summary of recent activities:
It has been a very busy day, but an extremely
successful day. All the maintenance work on
HST, every single item, has been successfully
completed. HST is now ready for re-deploy.
First, it now appears that all
of yesterday's concerns with the co-processor
and the DF224 are now resolved and everything
appears to be ok with them. The problem seems
to have been with the communications link from
the HST through the shuttle and to the ground.
This data path was subject to interference and
the result was memory dumps which implied erroneous
DF-224 operation. This diagnosis will be verified
when we can get a direct communications link from
HST to TDRSS, without going through the shuttle
communications system. This will likely occur
after EVA 5 is completed. The EVA operations take
priority and they require orientations which preclude
direct communications.
The orbit reboost took place before EVA 5. This
raised the HST orbit by about 7.5 km.
Jeff Hoffman and Story Musgrave were the crew for EVA 5.
As the EVA was starting an attempt was made to move
the solar array wings from parallel to the telescope
tube to perpendicular to the tube. This was done by
commanding from the STOCC. There was too much mechanical
resistance in the latches, so the arrays did not move.
The decision was made to proceed with the SADE-1
installation and then manually deploy the arrays.
The SADE-1 installation went slower than planned.
The SADE is one of the boxes which was not designed
to be orbit replaceable. The crew had a little more
trouble manipulating the many electrical cables than
with boxes designed for on-orbit maintenance. As the
crew was closing up the door the STOCC ran the
aliveness test, which was successful.
The astronauts then moved over to the solar arrays
and used a manual procedure to rotate the booms
perpendicular to the telescope tube. This operation
went well with no problems.
The GHRS was then powered down for the installation
of the redundancy kit. The doors were opened and
the kit, which consists of a small box and several
cable connectors, was installed. The crew went
on to close the large bay doors while the STOCC
ran the aliveness check for the repair kit. The
aliveness test was successful and the crew had no
trouble with doors. This completed the pre-planned
maintenance activities.
The STOCC then commanded the latches for the HGAs
to open. This was successful, the HGAs will be
deployed later.
The EVA crew then moved up to the forward end of the
telescope to install the MLI caps over the old
magnetometers. These are the caps which they manufactured
yesterday using MLI recovered from the WFPC installation
tool. They should protect the old magnetometers from
solar UV and atomic oxygen degradation. They should
also prevent any plates or material which does detach
from floating around and getting into the HST.
The TV images of the crew standing on the end
of the RMS arm near the HST aperture door with Australia
passing beneath them were particularly impressive.
The installation of the caps went without incident.
As the EVA crew was storing all their tools and
cleaning up the cargo bay the STOCC commanded
the unrolling of the solar arrays. The - array
was deployed first and came out very smoothly. The
HST was then rotated 180 degrees and the + array
was unrolled very smoothly as well.
A quick functional test of the solar arrays was
successful. The arrays were then rotated 90 degrees,
controlled by the new SADE-1. This slew started at
sunrise and the power output of the arrays gradually
increased as they became perpendicular to the sun.
The batteries were charged and are ready for HST deploy.
The HGAs (high gain antennas) were then both deployed
with absolutely no problems.
Problems/Issues/Changes under consideration:
NONE, everything is A-OK.
Near-term plans:
HST is ready for deploy. The HST will be grappled
by the RMS arm, raised out of the payload bay, the
aperture door will be opened and then HST will be
deployed. The deploy should take place about
2:30 AM tommorrow morning.
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