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[b]Launch on hold at T-4 minutes for technical issue[/b]
The launch of NASA's Juno spacecraft has been delayed as the Atlas V launch team works an issue with higher than expected cycles of the Centaur upper stage's helium charge system.
The launch team is reviewing the cycle rate as compared to a launch countdown rehearsal held a couple of weeks ago, and is performing a leak check.
[b]UPDATE[/b]: The leak check has been called off as the Centaur helium problem appears to be isolated to the ground-side of the system (as opposed to an issue with the launch vehicle). The team switched to a secondary helium system to clear the issue.
The launch team is now attempting to clear the range of any boats that may have strayed into the hazard area off the coast of Cape Canaveral.
The launch window extends today until 12:43 p.m. EDT (1643 GMT). The countdown is being held at the T-minus 4 minute mark.
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