Countdown begins again for shuttle launch
Posted: Sat, May 14, 2011, 8:44 AM ET (1244 GMT)
NASA started countdown clocks on Friday for Monday morning's scheduled launch of the space shuttle Endeavour on that orbiter's final mission. Countdown clocks started at 7 am EDT (1100 GMT) Friday for the launch, scheduled for 8:56 am EDT (1256 GMT) Monday from the Kennedy Space Center in Florida. The launch was previous scheduled for April 29, but scrubbed a few hours before the scheduled liftoff time when heaters in a hydrazine fuel line in one of the orbiter's three auxiliary power units failed to turn on. Technicians replaced a power switching box linked to the failure and successfully retested the system, although engineers were not able to conclusively identify the root cause of the problem. Forecasts call for a 70 percent chance of acceptable weather at launch.
NASA started countdown clocks on Friday for Monday morning's scheduled launch of the space shuttle Endeavour on that orbiter's final mission. Countdown clocks started at 7 am EDT (1100 GMT) Friday for the launch, scheduled for 8:56 am EDT (1256 GMT) Monday from the Kennedy Space Center in Florida. The launch was previous scheduled for April 29, but scrubbed a few hours before the scheduled liftoff time when heaters in a hydrazine fuel line in one of the orbiter's three auxiliary power units failed to turn on. Technicians replaced a power switching box linked to the failure and successfully retested the system, although engineers were not able to conclusively identify the root cause of the problem. Forecasts call for a 70 percent chance of acceptable weather at launch.
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