NASA officials conducted a second fueling test Friday on space shuttle Discovery in an effort to understand why sensors and valves weren't working properly during a previous test. During the test, part of the preparations for a planned launch in July, the external tank was filled with 500,000 gallons of liquid hydrogen and liquid oxygen. NASA officials didn't expect to have data on the test until later in the day. The fuel was expected to be unloaded in the afternoon. "Everything's going fine," NASA spokesman Bruce Buckingham was quoted as saying The Associated Press after the test started.
