The sun sets as space shuttle Discovery is seen at pad 39A at the Kennedy Space Center, Wednesday, March 11, 2009, in Cape Canaveral, Fla.. A hydrogen leak delayed the launch of Discovery scheduled for Wednesday afternoon. NASA did not set a new launch date. (AP Photo/John Raoux)
(AP) -- NASA feels it has a good shot at sending shuttle Discovery to the international space station on Sunday following repairs out at the launch pad.
A half-dozen or so workers were out at the Florida launch pad Friday, putting in a new hydrogen vent line hookup and fresh seals.
NASA called off Wednesday's launch attempt after hydrogen gas leaked into the air at the spot where a hydrogen gas vent line hooks up to Discovery's external fuel tank.
It was the latest delay for the mission to deliver a final set of solar wings to the space station. The earlier postponements were caused by different shuttle valves and pushed the flight back by a month.
Forecasters expect an 80 percent chance of good weather for the evening launch.
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