Now it is official - today's space shuttle Atlantis launch has been scrubbed due to a problem with ECO sensor number three.
Quote from the NASA home page:
Today's launch of space shuttle Atlantis has been officially scrubbed. It was announced on NASA TV at 7:24 a.m. EST.
Of the four engine cutoff sensors, ECO sensor number three gave false readings. NASA's current Launch Commit Criteria require that all four sensors function properly. The sensor system is one of several that protect the shuttle's main engines by triggering their shut down if fuel runs unexpectedly low.
Atlantis' scheduled launch on Thursday was delayed after two of the four engine cutoff, or ECO, sensors in the shuttle's external fuel tank gave false readings. A third sensor failed after the tank was drained of fuel. The sensor system is one of several that protect the shuttle's three main engines by triggering their shut down if fuel runs unexpectedly low.
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