I believe that is the backup.

Bowser — 9/29/2008 11:31:11 PM (archived)

I got the impression that was the backup, or redundant, equipment for communications. I read where they do have an extra one which hasn't been fired up since 2001.

It would make sense they'd have a couple around, if only to use to try out fixes.

The whole thread (9 posts)

STS 125 seriously delayed because of a failure on board of HST? - Raoul - 9/29/2008 5:05:46 PM
- failure on board of HST - Raoul - 9/29/2008 8:49:43 PM
  - Backups Not Available - carl - 9/29/2008 8:58:26 PM
    - re: B line - Raoul - 9/29/2008 9:34:52 PM
      - I believe that is the backup. - Bowser - 9/29/2008 11:31:11 PM
        
        Maybe this is a blessing in disguise - Socrates II - 9/30/2008 1:14:43 PM
        
        Does the public even care? - SpaceExpert - 10/1/2008 12:39:43 AM
        
        No, many of them don't usually care - Socrates II - 10/1/2008 12:31:39 PM
        
        NASA is very lucky this failure occured now rather than after STS 125 - Raoul - 9/30/2008 8:52:10 PM

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