On Sun, 17 Nov 2002, John Carmack wrote:
> video and gory details.
> http://www.armadilloaerospace.com/n.x/Armadillo/Home/News?news_id=182
"The important thing is that the Crossbow IMU survived, because
that costs more than everything else put together, and can have an
8 week lead time. I am going to buy a backup, in case we aren't so
lucky next time."
Also, having a spare can be significant to running a post-mortem on a
failure, if the original is beyond reach or no longer functional. For
example, the NEAR mishap investigation reported being significantly
inconvenienced by the lack of a ground spare for the exact model of gyro
NEAR used. (NEAR's first attempt at a braking maneuver for rendezvous
with Eros was aborted by a rough start which exceeded predefined limits...
but then, in a manner never completely explained, the spacecraft dropped
into safe mode and spent most of a day floundering in a confused state, in
which it managed to use up quite a bit of fuel somehow.)
Henry Spencer
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