The space shuttle Discovery is on pace for a Sunday launch after NASA engineers repaired a leaky gas venting system, officials said Saturday. The leak had canceled a planned launch on Wednesday. NASA hopes the seven-member crew can take off around 7:40 p.m. Sunday on a mission to the international space station, where they will deliver supplies needed to expand the station's crew to six people, CNN reported. "The vehicle is looking real good ... ," lead shuttle flight director Mike Moses said. "Basically, I think I can sum this up by just saying we're good to go tomorrow and we're looking forward to getting the count going." A leak in a hydrogen gas vent line forced Wednesday's delay. Repairs went smoothly, Moses said. The line funnels flammable hydrogen away from the launch pad during takeoff. The shuttle crew will be delivering the final parts needed for an expanded solar energy power system that will allow the station to double its crew to six people. The crew also will be dropping off Japanese astronaut Koichi Wakata, who will replace NASA's Sandy Magnus on the space station. The shuttle also will carry a replacement for a failed unit in a system that converts urine to drinkable water, NASA said.
