Legitimate question but a strange place to pose it...here in the land of
multiple engines, MELs, backup vacs, redundant electrical systems,
multiple 430s, GPS, VOR, ADF, and Loran (why not keep all of it?)

Perhaps I'm thinking of rec.aviation.ifr...


Depends. It was reported here, UK, that 1 of 4 sensors failed.

Why so much redundancy ? ; the cost of scrubbing the launch must have been
enormous.