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[vsnet-history 1851] HST (Starrfield, nova net)




From: starrfie@hydro.la.asu.edu (Sumner Starrfield)
Subject: HST (fwd)-from Jeff Hester
Date: Sat, 4 Dec 93 14:10:55 MST

Forwarded message:
>From JJH@wfpc.la.asu.edu Sat Dec  4 13:21:15 1993
Date: Sat, 4 Dec 1993 13:27:49 -0700 (MST)
From: JJH@wfpc.la.asu.edu
To: astro@bigbang.la.asu.edu
Message-ID: <vsnet-history1851@hoge.baba.hajime.jp>
Subject: HST

The information Sumner forwarded seems pretty complete.  Grappling occurred
exactly on time, and they were about 20 minutes ahead of their timeline by the
time the telescope was stowed and the umbilical linking the HST to shuttle
power and electronics was connected.  Only update is that TV inspection of the
HGA latches showed that they were in fact ready to latch. When the latch
commands were sent, the +V3 latch appeared to latch properly, while the -V3
latch caught well enough to allow the HST to be given a reboost prior to
release.  (Recall that "complete" latch is enough to tolerate launch stresses,
which are orders of magnitude greater than the stress of a gentle OMS shove.) 
The rendevous was carried out very efficiently -- more efficiently than
prelaunch simulations, in fact -- so that Endeavour has enough fuel reserve for
a good reboost. 

The fun starts tonight, possibly as early as 9:00 MST, when Story Musgrave and 
Jeff Hoffman begin the first EVA.  Goals for the first EVA are changeout of 
RSUs (that's Rate Sensing Units, or gyroscopes, for the uninitiated) 2 and 3, 
ECUs (RSU Electronic Control Units) 1 and 3, and the spacecraft fuses (which 
were improperly manufactured such that the fuse elements are in parallel to the 
power lines -- think about it).  Also on tap is preparation of the SAC, or 
Solar Array Carrier, getting ready for Solar Array changeout on EVA 2.  

The question of the kink in the bistem is the current hot topic.  The kink in 
the outboard bistem on the +V2 array was really quite spectacular, even if the 
official description is "not totally unexpected."  An attempt will be made to 
stow the solar arrays by ground control shortly after the end of the EVA 
tomorrow morning, with plenty of contingency plans for how to throw an array 
overboard if it won't roll up.


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