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United Space Alliance workers explain tile installation around Discoverys nose landing gear to Shuttle Program Manager Bill Parsons (center). Discovery has been undergoing Orbiter Major Modifications. The OMM work ranged from wiring, control panels and black boxes to gaseous and fluid systems tubing and components. These systems were deserviced, disassembled, inspected, modified, reassembled, checked out and reserviced, as were most other systems onboard. The work included the installation of the Multifunction Electronic Display Subsystem (MEDS) a state-of-the-art glass cockpit.