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![]() Discovery's fuel tank arrives at Kennedy Space Center BY SPACEFLIGHT NOW Posted: March 1, 2006
Pulled by the Freedom Star, one of NASA's solid rocket booster retrieval ships, the Pegasus tank barge reached Port Canaveral at lunchtime. Tugboats maneuvered the barge into the receiving dock shortly after 5 p.m. The Lockheed Martin-made tank left the Michoud Assembly Facility in Louisiana on Saturday. Crews plan to offload the tank this evening and tow it into the Vehicle Assembly Building for several weeks of post-arrival testing, final work on the foam insulation and preparations for mating with the solid rocket boosters. The boosters have been stacked atop a mobile launch platform. After the tank is added to the stack, space shuttle Discovery will be brought over from its nearby hangar for attachment. Rollout to launch pad 39B will occur a few weeks before liftoff. This tank, known as ET-119, has been modified since the STS-114 shuttle launch last July, including removal of two Protuberance Air Load (PAL) ramps. One was a 14-foot-long, 14-pound strip of foam at the top of the liquid oxygen portion of the tank; the other was 38 feet in length consisting of 21 pounds of foam on the liquid hydrogen tank. The ramps were designed to protect a cable tray and pressurization lines running up the exterior of the tank from aerodynamic loads during launch. But after Discovery's mission last year in which a large chunk of the hydrogen PAL ramp broke free, NASA was eager to remove the strips from future tanks. Analysis has shown that the ramps aren't necessary. However, wind tunnel tests to prove the tank structures will survive the forces of ascent without the PAL ramps do not begin until mid-March. |
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