Collection Item Summary:
The Space Shuttle used five identical general-purpose computers for flight management and control. In the event of a failure of the Shuttle's primary avionics software system, one of the five general purpose computers would be designated as a "backup," and it would be connected to one of these Backup Flight Controllers. (An orbiter carried three of these.) These backup controllers were never needed in any of the Shuttle missions, but they were considered essential to the safety of the crew.
NASA tranferred this unflown controller to the Museum in 2012.