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From: edotto@ux1.cso.uiuc.edu (Ed Otto)
Newsgroups: sci.space.shuttle
Subject: Re: Definition of "APU"
Message-ID: <1991Apr15.163428.21503@ux1.cso.uiuc.edu>
Date: 15 Apr 91 16:34:28 GMT
References: <3331@beguine.UUCP>
Organization: University of Illinois at Urbana
Lines: 31

Tom.Hocking@bbs.acs.unc.edu (Tom Hocking) writes:

>According to my list of NASA Acronyms, APU stands for "Auxiliary Power
>Unit."  However, the shuttle needs them to generate power any time the
>orbiter is not attached to umbilicals.	

The APU, or Auxilary Power Unit, does NOT provide 'power'...it provides
hydraulic pressure to move the elevons and gimbal the engines, etc.

The electricity on-board the shuttle is provided by means of several
fuel cells located under the mid-deck.


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