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Additional details about the investigation into the crash of SpaceShipTwo have now been released.
The investigators are focusing on the telemetry that the pilots were receiving, as well as the system for activating the ship’s braking feathering system.
As I have noted in the comments, we must try not to speculate on this subject, especially because this issue could do harm to innocent people. For example, some reports have incorrectly attributed the crash to pilot error. To say this now is false. All the investigation has noted is that the co-pilot took the first step to activating the feathering system, as he was supposed to do, though slightly early. The feathering system then deployed on its own, without the second command being given.
We do not yet know the finer details that make his action significant, or not. This is why the investigation is checking into the telemetry the pilots were getting, which might have affected when they did what they did.
We need to wait for more data.