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- Σ NATION, Page 55American NotesSPACETune In Next Leak
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- Less than an hour after engineers began pumping 385,000 gal.
- of highly explosive liquid hydrogen into the fuel tank of the
- space shuttle Columbia, the countdown was halted and the flight
- scrubbed -- for the third time in just over three months. "We
- do not consider that the vehicle is safe to fly," declared
- shuttle director Robert Crippen, who earlier this summer
- grounded the entire fleet when leaks turned up in the shuttle
- Atlantis as well. NASA has not been able to get a shuttle off
- the ground since April, when it launched the now crippled
- Hubble telescope. Though shuttle engineers once talked of 24
- flights a year, so far NASA has managed only three in 1990.
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- Engineers have tried to fix the plumbing between the shuttle
- and its huge external tank, but the leaks keep turning up in
- different places. "My first reaction was frustration," said
- shuttle scientist Ed Weiler, "but my next thought was `My God,
- I'm glad they stopped; some of my friends are aboard.'"
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