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The Hubble High Fidelity Mechanical Simulator (HiFi). It is a mechanical mock-up of the HST aft shroud. Hubble's scientific instruments, guidance sensors, electrical harnesses, thermal blankets, and electronics equipment are located in Hubble's aft shroud. The HiFi was built to perform verification testing of scientific instruments to be installed in Hubble and to provide for astronaut training.

The horizontal black rectangle toward the top of the HiFi is the location in which the Wide Field Camera 3 will be installed on the servicing mission. When we visited, the WFC3 was being tested in the Space Environment Simulator.

Additional information, including an exploded view diagram of the HiFi and the area of the HST it simulates, can be found in Clean Assembly and Integration Techniques for the Hubble Space Telescope High Fidelity Mechanical Simulator.