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From: nraoaoc@nmtsun.nmt.edu (Daniel Briggs)
Newsgroups: sci.space.shuttle
Subject: Re: Launch scrubbed
Message-ID: <4076@nmtsun.nmt.edu>
Date: 10 Apr 90 16:15:22 GMT
References: <47051@ames.arc.nasa.gov>
Reply-To: dbriggs@nrao.edu (Daniel Briggs)
Organization: National Radio Astronomy Observatory, Socorro NM
Lines: 23

In article <47051@ames.arc.nasa.gov> yee@trident.arc.nasa.gov (Peter E. Yee) writes:
>Just watched them scrub the launch.  Apparently APU 1 was not performing
>within acceptable margins.  Although there is sufficient time in the window
>to perform a recycle, the decision was that this problem will require enough
>time to merit a full scrub.
>							-Peter Yee

As I watched them scrub, it seemed to me that there has been an awful
lot of trouble in the course of the program with the APUs.  Are the
APUs just fuel cells ala Apollo, or are they something more
sophisticated?  (BTW, I am under the impression that this is an
acronym for Auxiliary Power Unit.  Am I right?)  Has any of the NASA
watchers (or even NASA itself), compiled a simple list of all the
scrubs in the Shuttle program, and the primary cause of each?  It
would be fascinating to see this list sorted by basic category.  My
guess is that APUs would come in about third, right after weather and
generalized computer troubles.  Anyone have the data we need to do
this?

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