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- From: roberts@cmr.ncsl.nist.gov (John Roberts)
- Subject: Re: COSTAR
- Message-ID: <Bxw7Hq.JtG.1@cs.cmu.edu>
- X-Added: Forwarded by Space Digest
- Sender: news+@cs.cmu.edu
- Organization: National Institute of Standards and Technology formerly National Bureau of Standards
- Original-Sender: isu@VACATION.VENARI.CS.CMU.EDU
- Distribution: sci
- Date: Wed, 18 Nov 1992 03:32:28 GMT
- Approved: bboard-news_gateway
- Lines: 32
-
-
- -From: roelle@uars_mag.jhuapl.edu (Curtis Roelle)
- -Subject: Re: COSTAR
- -Date: 17 Nov 92 15:07:18 GMT
- -Organization: Johns Hopkins University
-
- -Has an assessment of potential risks has been prepared and reviewed?
- -What could go wrong? Where are the primary risk areas? e.g. failure
- -to grapple the telescope, failure to extract the module COSTAR
- -replaces, engineering uncertainties that might lead to the new optical
- -path missing the aperture opening, etc.
-
- During the closeout, a technician inadvertently leaves an unopened Coca-Cola
- can inside COSTAR. (Later analysis of the checklist reveals that "remove
- any extraneous beverage cans" was signed off by *two* different inspectors.)
- When the boom is deployed, it ruptures the can, causing the entire interior of
- HST to be coated with a liquid that quickly dries to a black, tarry layer. :-)
-
- Somewhat more plausible scenario - the mirrors only partially deploy,
- blocking the original light paths, but not implementing the new light paths,
- and efforts to retract them fail. (I presume they'll try to deploy while
- HST is still attached to the Shuttle - if all else fails, a couple of burly
- astronauts can try to yank the whole assembly out of HST.)
-
- The mirrors and the boom *are* designed to be retractable, aren't they?
-
- Another question: is COSTAR designed to be hooked into the existing HST
- power supply?
-
- John Roberts
- roberts@cmr.ncsl.nist.gov
-
-