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| NASA Photo |
On Saturday, Orbital Sciences Corporation conducted a wet dress rehearsal for the Antares rocket in preparation its Test Flight scheduled for later this week on April 17.
Late in the countdown, at about T-16 minutes, the test was halted because the launch team had detected a technical anomaly in the process. Orbital has determined that a secondary pyro valve aboard one of the two first-stage engines used in the propellant chilldown process was not functioning properly.
A replacement unit will be installed within 24 hours with the goal of maintaining the April 17 launch date.
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