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NASA Scrubs Launch Due to Faulty Fuel-Tank Sensor
VUSE g-EE-k writes "NASA has scrubbed Wednesday's launch of Discovery due to a faulty fuel-tank sensor in the external fuel tank. They are going to begin the troubleshooting process. They have not released details as to how long this delay will last. The crew have begun to get off the shuttle. For more information, see the NASA TV site. Drudge Report has some initial coverage of the scrub."
Reader adefa adds a link to NASA's Space Shuttle launch page with more info.
One of four sensors used to detect a low level of hydrogen propellent. They need 2 to work of the four. After they detank, it can be diagnosed, possibly launching tomarrow.
NASA has through July 31 to launch Discovery or else wait until September 9 due to the need to lift off and separate the external tank in daylight.
The external fuel tank burns up in the atmosphere after launch. They are never reused or AFAIK even recovered. The external fuel tank on the pad now, and every part in it, is brand new.
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I would hope F, as there is no such thing as -400 C.
I have seen the future, and it is inconvenient.
There's a daily lauch window of about 10 minutes when the ISS is in the right place. Those 10 minutes occur during the night between July 31st and September 9th.