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KENNEDY SPACE CENTER, FLA. - In the Orbiter Processing Facility bay 3, technicians on the Hyster forklift maneuver main engine No. 3 into place in Discovery. The main engine configuration is manufactured by Pratt & Whitney Rocketdyne in Canoga Park, Calif., and includes a Pratt & Whitney high-pressure fuel turbo pump. Each space shuttle main engine is 14 feet long, weighs about 6,700 pounds, and is 7.5 feet in diameter at the end of the nozzle. Discovery is being processed for its next mission, STS-116 (12A.1), to deliver a third truss segment, a SPACEHAB module and other key components to the International Space Station. The launch is currently scheduled no earlier than Dec. 14. Photo credit: NASA/Kim Shiflett