From Newsgroup: sci.space.news

April 29, 2011

Joshua Buck 
Headquarters, Washington                                    
202-358-1100 
jbuck{at}nasa.gov 

Kyle Herring 
Johnson Space Center, Houston 
281-483-5111 
kyle.j.herring{at}nasa.gov 
RELEASE: 11-130

NASA RESETS SHUTTLE ENDEAVOUR'S LAUNCH FOR NO EARLIER THAN MAY 2

WASHINGTON -- NASA managers met Friday to discuss the status of space 
shuttle Endeavour's launch to the International Space Station. The 
launch was postponed because of a heater issue associated with the 
shuttle's hydraulic power system. The next launch attempt will be no 
earlier than May 2. 

The shuttle has three Auxiliary Power Units (APUs) that provide 
hydraulic power to steer the vehicle during ascent and entry. NASA 
launch commit criteria and flight rules require all three APUs to be 
fully operational for launch. 

Endeavour's external fuel tank was drained of more than 500,000 
gallons of liquid hydrogen and oxygen so engineers can access the 
area Saturday and evaluate the issue with APU 1. 

For the latest information about the STS-134 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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