In the fourth stage of the Vega VV17 rocket, some electrical connections were wrong, the control system did not detect it and the launch failed, and the two satellites it carried were lost. As confirmed by the European Space Agency (ESA), this was the sequence that led to its poor fate.
On November 17, ESA and Arianespace announced the loss of the Vega VV17 mission. The rocket carried two payloads: the Spanish SEOSAT-Ingenio Earth Observation Satellite and the French TARANIS.
The first three stages performed well until the fourth or higher stage opened. AVUM (attitude and cursor upper module) Eight minutes after takeoff. By then, the trajectory had degraded, and then lost control of the rocket, and finally lost control of the entire mission.
A preliminary investigation using available data immediately after launch has identified issues related to system integration Thrust Vector Control (TVC) AVUM is the most likely cause of failure and has been confirmed by ESA freed.
Launch service provider Arianespace and the European Space Agency itself have established a Independent Investigation Committee (IEC), The report has released a report on the cause of the accident.
The IEC concluded that the failure of the VV17 was not due to design issues, but “vehicle loss due to incorrect wiring and connection of the control lines of the TVC electromechanical actuators, reverse steering commands and trajectory degradation.
The sequence that led to the disaster
The detailed sequence is as follows: “The misleading integration procedure led to the inversion of the electrical connection. Although different controls and tests were carried out between the integration of the AVUM superior and the final acceptance of the transmitter, the specific requirements and regulations were still not detected. Inconsistency between controls”.
IEC also proposed recommend Immediately and permanently ensure safety, quickly return to launch operations, and ensure long-term confidence in European launchers.
The initial improvements include additional inspections and tests on the next two Vega launchers, the hardware of which is already in production.
Some suggestions were also made to further ease the Vega assembly line in Italy (the main contractor ( Avio), and the final acceptance in French Guiana.
Launch service provider Arianespace and launch system development agency ESA will be responsible for oversight. These agencies will maintain the new Vega rocket that will be launched. VV18, Scheduled The first quarter of 2021.