June 17, 2009

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

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

RELEASE: 09-138

FUEL LEAK AGAIN POSTPONES LAUNCH OF SPACE SHUTTLE ENDEAVOUR

CAPE CANAVERAL, Fla -- NASA postponed the launch of space shuttle Endeavour's STS-127 mission Wednesday because of a leak associated with the gaseous hydrogen venting system outside the shuttle's external fuel tank

Endeavour's next launch opportunity is July 11 This date comes after the end of an orbital sun-angle condition called a beta angle cut-out, which occurs between June 22 and July 10 The cut-out creates a thermal condition that prohibits shuttle and space station docked operations

The gaseous hydrogen venting system is used to carry excess hydrogen safely away from the launch pad Wednesday's leak is similar to one that prevented Endeavour's launch on June 13

The 16-day mission to the International Space Station will feature five spacewalks and complete construction of the Japan Aerospace Exploration Agency's Kibo laboratory Astronauts will attach a platform to the outside of the Japanese module that will allow experiments to be exposed to space

Mission Commander Mark Polansky, who has a Twitter account named Astro_127, can be followed online at:

http://www twitter com/Astro_127

For information about NASA TV streaming video, downlink and schedule information, visit:

http://www nasa gov/ntv

For the latest information about the STS-127 mission and its crew, visit:

http://www nasa gov/shuttle

For information about the International Space Station, visit:

http://www nasa gov/station

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