Tank Test, Take Two

Tank Test, Take Two

Technicians at NASA's Kennedy Space Center are conducting a new tanking test
at Launch Pad 39 to continue troubleshooting two issues that arose during
the tanking test on April 14.

Engineers will evaluate the liquid hydrogen sensors in the tank that gave
intermittent readings during last month's test. These sensors serve as fuel
gauges to notify the Space Shuttle Main Engines to shut down when
propellants reach a certain level in the tank. This is critical in the safe
operation of the main engines.

In addition, they will also evaluate a liquid hydrogen pressurization relief
valve that cycled more times during the first tanking test than is standard.
This valve opens and closes to ensure the liquid hydrogen stays at the
correct temperature.

When the tanking test is completed, preparations for rolling Space Shuttle
Discovery back to the Vehicle Assembly Building (VAB) will begin.

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Jacques :-)

www.spacepatches.info