What caused the early shutdown of Virgin rocket's upper stage? The previous failure was also due to early shutdown of engine, although that was first stage failure. As per reports available in public, it was failure of LOX feed line for previous failure. Is the same anomaly repeated for upper stage?
It appears that the engine overheated. The failure began with an issue with a $100 part, or more specifically a fuel filter. It was dislodged and therefore caused the overheating of the engine. This then prematurely shut it down. One other thing to note, it seems that faulty telemetry was at fault. Looking at the launch video, the telemetry reported nonsensical speed and altitude. Combined with the fact that they orginally said that they had achieved orbit, and then around a half an hour later revised that statement, it appears that they didn't even have accurate information on the rocket and therefore were unable to attempt to fix the problem in the moment.