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Northrop Grumman successfully resupplies ISS after overcoming software glitch | The premature engine shutdowns were triggered by a conservative software safeguard.


The premature engine shutdowns were triggered by a conservative software safeguard.

Running a day late, Northrop Grumman's Cygnus XL cargo freighter pulled alongside the International Space Station on Thursday, delivering more than 5 tons of supplies and experiments to the lab's seven-person crew. A short time later, the robot arm positioned the spacecraft over an attachment port on the station's Unity module, and 16 bolts drove closed to create a firm mechanical connection with the ISS. But the Cygnus spacecraft's journey from the launch pad to the ISS encountered trouble early Tuesday, when the ship's main engine shut down earlier than planned during two burns to fine-tune its approach to the space station.

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