Kennedy Space Center workers will conduct a second test of shuttle Discovery's fuel tank to determine why sensors critical for flight failed an earlier one, a NASA spokesman said on Monday. The work was ordered after puzzling failures of two sensors that detect when the tank is filled with liquid hydrogen. The problem is unrelated to another tank issue that had prompted managers to delay Discovery's launch from May to July and NASA is holding firm to its plans for a July launch, Reuters reported. The orbiter itself has been cleared as the cause of the hydrogen sensor problem, said Kennedy Space Center spokesman Bruce Buckingham. "We're going to go back and redo the test since we have more time," Buckingham said. The retest should narrow down the problem to either the sensors or faulty wiring, he said. Discovery will not fly with its current fuel tank, no matter what the test results show. --More 2337 Local Time 2037 GMT
