Xref: utzoo sci.space:26437 sci.space.shuttle:6882
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From: sheppard@caen.engin.umich.edu (Ken  Sheppardson)
Newsgroups: sci.space,sci.space.shuttle
Subject: Re: space news from Nov 19 AW&ST
Message-ID: <1990Dec14.153328.20072@engin.umich.edu>
Date: 14 Dec 90 15:33:28 GMT
References: <1990Dec13.062441.16545@zoo.toronto.edu> <1990Dec14.130555.12464@eagle.lerc.nasa.gov>
Sender: news@engin.umich.edu (CAEN Netnews)
Organization: University of Michigan Engineering, Ann Arbor
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In article <1990Dec14.130555.12464@eagle.lerc.nasa.gov> lvron@saturn.lerc.nasa.gov writes:
>In article <1990Dec13.062441.16545@zoo.toronto.edu>, 
>     henry@zoo.toronto.edu (Henry Spencer) writes...
>
>>Space station designers trying to decide whether it is more important to
>>get started on the latest redesign or finish the enormously complex series
>>of preliminary design reviews on the last design.  NASA favors the latter,
>>on the grounds that much of it will not need to be re-done.  [Wanna bet?]
>
>A lot depends on how much of the PDR material covers components that would
>remain themselves intact (although moved around all over the place) after 
>a redesign.  Some components will remain more-or-less intact, such as the
>photovoltaic arrays and the associated beta gimbals (unless something's 
>happened in the project office I haven't heard about yet).  In those cases,
>you probably would want to get the PDR review done.  But I'd take my time
>and have one eye on redesign issues at the same time, just in case.
>
   The PDR concluded some time ago. The review in question is the ISPDR
   (Integrated Systems Preliminary Design Review) which looks at interface
   issues, overall system performance, etc. - the sort of things that would 
   change significantly due to a configuration change. Individual components 
   and subsystems were examined during the PDR.


===============================================================================
 Ken Sheppardson                                  Email: kcs@sso.larc.nasa.gov
 Space Station Freedom Advanced Programs Office   Phone: (804) 864-7544
 NASA Langley Research Center                     FAX:   (804) 864-1975
===============================================================================