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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