4 shuttles - 1 set of electronics??

[r.l. schieve]

I am not a usual reader of this newsgroup so I hope this
has not already been discussed...

I have heard that while the US has more than one shuttle,
in an effort to save money, only one set of some of the more
expensive electronics exists or existed as that one set was
blown up with the Challenger. The one set of electronics was
moved from shuttle to shuttle as needed and replacing this set
is one more complication in getting another shuttle off the
ground.

Does anyone know if this is true and if so, what components
were moved from shuttle to shuttle.

Rick Schieve
...ihnp4!ihu1g!rls