Dec 9, 2007

Mike Curie Headquarters, Washington 202-358-4715 michael curie@nasa gov

Candrea Thomas Kennedy Space Center, Fla 321-867-2468 candrea k thomas@nasa gov

RELEASE: 07-272

NASA POSTPONES SHUTTLE ATLANTIS LAUNCH

CAPE CANAVERAL, Fla - NASA has delayed Sunday's launch of space shuttle Atlantis on its STS-122 mission to the International Space Station Shuttle program managers made the decision at 7:24 a m EST after a failure occurred in a fuel sensor system while Atlantis' external fuel tank was being filled

One of the four engine cutoff, or ECO, sensors inside the liquid hydrogen section of the tank gave a false reading 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

The Mission Management Team will meet at 9 a m Sunday to discuss the issue and a possible future launch date A news conference will be held after the meeting's conclusion

Atlantis' scheduled launch on Thursday was delayed after two liquid hydrogen ECO sensors gave false readings A third sensor failed after the tank was drained of fuel

The main objective of Atlantis' 11-day mission is to install and activate the European Space Agency's Columbus laboratory, which will provide scientists around the world the ability to conduct a variety of life, physical and materials science experiments

For the latest information about the STS-122 mission and the ECO sensor system, visit:

http://www nasa gov/shuttle

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