From Newsgroup: sci.space.news

May 1, 2011

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


Candrea Thomas      
Kennedy Space Center, Fla. 
321-867-2468 
candrea.k.thomas{at}nasa.gov 

RELEASE: 11-131

SHUTTLE ENDEAVOUR LAUNCH NO EARLIER THAN MAY 8 

CAPE CANAVERAL -- NASA managers have determined space shuttle 
Endeavour will not launch before Sunday, May 8, but will not 
officially set a new launch date until early this week. 

After Friday's launch scrub, Kennedy Space Center technicians searched 
for the cause of a failure in a heater circuit associated with 
Endeavour's hydraulic power system. The failure was found to be in a 
power circuit in a switchbox in the shuttle's aft compartment. 

Managers and engineers are developing a schedule to remove and replace 
the switchbox and retest the new unit. That work will delay 
Endeavour's launch until at least May 8. 

The shuttle has three Auxiliary Power Units (APUs) that provide 
hydraulic power to steer the vehicle during ascent and entry. The 
hydrazine fuel lines on each APU have two heater circuits that 
prevent the fuel from freezing while the shuttle is in space. NASA 
launch commit criteria and flight rules require all three APUs and 
heater circuits to be operational for liftoff. 

Endeavour's six astronauts have returned to NASA's Johnson Space 
Center in Houston for several days of additional training. For the 
latest information about the shuttle mission and its crew, visit: 

http://www.nasa.gov/shuttle  
	
-end-

--- Synchronet 3.14a-Win32 NewsLink 1.85
--- SBBSecho 2.11-Win32