Thu, Apr 14, 2005
First Time In More Than Two Years
Discovery passed another critical milestone Thursday, as the
space shuttle's external fuel tank was filled to launch levels in
preparation for its return to flight. The test began at 0814 EDT on
Launch Pad 39B at Kennedy Space Center, FL.
During the test, the tank was filled with ultra-cold hydrogen
and oxygen propellants, known as "cryogenics." The test is designed
to evaluate how the tank, orbiter, Solid Rocket Boosters and ground
systems are performing under full "cryo-load."
Throughout testing, engineers observed the effectiveness of key
safety modifications made to the External Tank. NASA has replaced
the tank's original foam bipod ramp with a new heater system to
keep the fitting clear of ice. Experts also paid attention to the
newly designed "drip lip," which reduces ice accumulation on the
liquid oxygen feedline bellows.
During cryo-loading, NASA's ice/debris team inspected the tank,
evaluating ice and frost build-up. While ice formation is normal
during cryo-loading, the team compared its development to safety
testing completed at various research facilities around the
country.
The test concluded at 4 p.m. and was followed by approximately
two hours of propellant off-loading. The Rotating Service Structure
(RSS) will be rolled back into place by 7 p.m. Friday evening.
Hatch closure of Raffaello, the Italian-built Multi-Purpose
Logistics Module, also occurred at 9:18 a.m. in preparation for
launch aboard Discovery. The closure signifies yet another
significant milestone in NASA's steady progression toward Return to
Flight. Inside the 15-by-21 foot Raffaello are 12 "racks," which
hold parts, clothing, food and experiments bound for the
International Space Station. After the module's contents are
delivered, it will be filled with the Station's used supplies and
concluded experiments for transportation back to Earth.
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