Aug 27, 2009

Allard Beutel Kennedy Space Center, Fla 321-867-2468 allard beutel@nasa gov

John Yembrick Headquarters, Washington 202-358-1100 john yembrick-1@nasa gov

RELEASE: 09-200

NASA DELAYS SPACE SHUTTLE DISCOVERY LAUNCH

CAPE CANAVERAL, Fla -- NASA managers postponed Friday's 12:22 a m EDT launch of space shuttle Discovery to allow engineers more time to develop plans for resolving an issue with a valve in the shuttle's main propulsion system Launch now is targeted for no earlier than 11:59 p m Friday, Aug 28, from NASA's Kennedy Space Center in Florida

During loading of the shuttle's external fuel tank for Wednesday's launch attempt, a liquid hydrogen fill and drain valve located in Discovery's aft compartment failed to provide the proper indication when it was commanded to close Engineers cycled the valve five times Wednesday evening to collect data on the valve and its associated actuator and position indicator

NASA managers decided Thursday that more time is needed to analyze the test data and develop alternative procedures for confirming that the valve is closed if the valve fails to provide the proper closed indication during Discovery's next launch attempt

Discovery's 13-day STS-128 flight to the International Space Station will deliver storage racks; materials and fluids science racks; a freezer to store research samples; a new sleeping compartment; an air purification system; and a treadmill named after comedian Stephen Colbert

For information about the space station, visit:

http://www nasa gov/station

For the latest information about the STS-128 mission and its crew, visit:

http://www nasa gov/shuttle

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