Sun, 17 May 2009 09:19:06 PM GMT+0200
We now are 5 hours, 31 minutes into today’s spacewalk.
Massimino and Good have successfully removed the STIS cover plate, unscrewing 111 fasteners.
With the plate out of the way, Massimino will be able to finally access the electronics card that he and Good will replace. To actually remove the old card, Massimino will use a card extraction tool, just as Grunsfeld did during the third spacewalk. He’ll then store it in a transport case, detach the extraction tool and use the tool to unpack and install the new card. He’ll also install the new card’s simpler cover, which only requires him to engage two locking pins.
The remaining STIS work is estimated to take about 2 hours, 40 minutes.