Astra explains the issue happened during the upper stage separation part of the launch, with the “anomaly” preventing the upper stage from completing the mission. The investigators narrowed this issue down to the payload fairing, which was supposed to deploy completely before the upper stage ignition kicked off. That didn’t happen, though, because the five separation mechanisms for this fairing were engaged in the wrong order.
That unexpected change in the order of the separation mechanisms caused movement that led to a “disconnection,” preventing the final separation mechanism from firing like it was supposed to. Because that mechanism failed, the payload fairing wasn’t able to fully break free before the aforementioned upper stage ignition happened.
That wasn’t the only problem, however, with Astra also revealing that a software problem prevented the Thrust Vector Control system from working. Because the upper stage was unable to use this system, it started tumbling after the separation stage failed, sealing the mission’s fate. The launch didn’t manage to get the small satellites into orbit and all four of them were lost as a result.
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