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The European Space Agency (ESA) this week released the results of its investigation into the July 10, 2019 launch failure of Arianespace’s Vega rocket, the first such failure after 14 successful launches.
The failure had occurred about the time the first stage had separated and the second stage Z23 rocket motor was to ignite. The investigation has found that the separation and second stage ignition both took place as planned, followed by “a sudden and violent event” fourteen seconds later, which caused the rocket to break up.
They now have pinned that event to “a thermo-structural failure in the forward dome area of the Z23 motor.”
The report says they plan to complete corrective actions and resume launches by the first quarter of 2020.