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A Power Control Unit [direct link to 386K PDF] trainer/simulator. The PCU is the central distribution box which routes electricity throughout Hubble; it was swapped out on Servicing Mission 3B. This was a challenge, as it was not designed to be replaced.

This unit was located in the balcony overlooking the clean room (part of the clean room can be seen through the windows at right).

Picture 1 of 2.