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KENNEDY SPACE CENTER, FLA. -- Workers in the Spacecraft Assembly and Encapsulation Facility-2 (SAEF-2) push the second half of the nose fairing (left) toward the Tracking and Data Relay Satellite-I (TDRS-I) already enclosed by the first half. The second in a new series of telemetry satellites, TDRS-I replenishes the existing on-orbit fleet of six spacecraft. The TDRS System is the primary source of space-to-ground voice, data and telemetry for the Space Shuttle. It also provides communications with the International Space Station and scientific spacecraft in low-Earth orbit such as the Hubble Space Telescope. This new advanced series of satellites will extend the availability of TDRS communications services until about 2017. Launch of TDRS-I is scheduled for March 8 aboard a Lockheed Martin Atlas IIA rocket from Pad 36-A, Cape Canaveral Air Force Station