An alarm signaling the loss of one of five General Purpose Computers that run the shuttle awakened the Atlantis crew about 90 minutes after going to sleep today, but the crew is in no danger.
NASA said the crew performed a standard 30-minute malfunction procedure to transition systems management from GPC-4 to GPC-2 after the former dropped off the on-board network. Troubleshooting will be performed Friday.
Because of the interrupted sleep, the crew will sleep in a haf-hour later than originally scheduled, which puts their planned wake-up time around 1 a.m. Friday.
The day's activity consists of more transfers of cargo between the shuttle and station, activity now about 70 percent complete.
The four-person Atlantis crew and six station counterparts will answer questions during a joint news conference at 9:24 a.m. EDT.
Here was the schedule before the alarm:
12:29 a.m. Atlantis and station crews awake
12:45 a.m. ISS flight director update
2:39 a.m. Cargo transfers resume
6:44 a.m. Media interviews with CBS Radio, KYW-TV Philadelphia, Associated Press
8:04 a.m. Media interviews with Reuters, KYW Radio Philadelphia, WPVI-TV Philadelphia
9:24 a.m. Joint crew news conference
2:59 p.m. Space station crew sleep
3:29 p.m. Atlantis crew sleeps
4 p.m. Mission status briefing
Space news and analysis from Kennedy Space Center and Cape Canaveral 
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