http://www.spaceflightnow.com/shuttle/sts115/status.html
0802 GMT (4:02 a.m. EDT)
SCRUB! Today's launch attempt has been stopped by the fuel cell problem.
Another try could come as early as Thursday, with a target liftoff time
of 12:03 p.m. EDT.
The concern involves a voltage spike noted during activation of fuel
cell No. 1. Atlantis has three fuel cells -- located beneath the payload
bay -- that use liquid hydrogen and liquid oxygen reactants to generate
the electricity needed to power the shuttle's systems during flight and
create drinking water for the astronauts as a byproduct. NASA won't
allow a shuttle to launch unless all three fuel cell devices are working
properly.
Backup launch opportunities are available Thursday and Friday. If
Atlantis doesn't fly by then, the shuttle must wait until after the
Russian Soyuz flight to the space station proceeds later this month.
That would delay Atlantis until at least the end of September, and
possibly longer, depending on NASA's decision whether to keep daylight
launch conditions a requirement for this mission. The next daytime
launch slot for Atlantis is late October.
--
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