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A command intended to correct a malfunction in one of the Beresheet spacecraft's inertial measurement unit led to a chain of events that turned off its main engine during landing, according to a preliminary investigation conducted by SpaceIL.
While a full investigation will be completed in the coming weeks, SpaceIL CEO Dr. Ido Anteby said Wednesday that the inertial measurement unit (IMU) malfunction during the landing maneuver was its first failure during the seven-week mission to the moon.
A chain of events caused by a command sent from the SpaceIL control room turned off the spacecraft's main engine and prevented proper engine activation, Anteby said, making a crash landing on the moon inevitable.
The malfunction occurred only minutes before Beresheet, developed by SpaceIL and Israel Aerospace Industries, was due to complete a historic landing – a feat previously achieved only by the United States, Russia (then the USSR) and China – after an epic 6.5 million km. journey since it blasted off Cape Canaveral, Florida, on board a SpaceX rocket on February 22.
"There was no incident like this since the mission began," Anteby told reporters. "After it happened, an activation command was sent to [the IMU]causing a chain of events in which the main engine stopped and was unable to return to continuous operation."
While the spacecraft attempted to restart its engine several times, the attempts proved unsuccessful.
"Immediately after the incident, we began our investigation. This is part of our culture of learning, reaching conclusions and transparency, "said Anteby.
" We have completed the first stage of the investigation, and it focuses only on understanding the facts and the sequence of events. We tried to understand what happened, based on telemetry from the spacecraft. "
Only once a full investigation has been completed, Anteby said, will engineers know whether something could have been done differently and whether the team was prepared for such a malfunction . All the understandings, he added, will contribute to the success of a future mission.
"I am proud of SpaceIL's team of engineers for their wonderful work and dedication," said SpaceIL chairman Morris Kahn. an integral part of a complex and pioneering project. What is important now is to learn the best possible lessons from our mistakes and bravely continue forward. That's the message we'd like to convey to the people in Israel and the entire world. This is the spirit of the Beresheet project. "
Kahn, the lead donor behind the project, has already held several meetings with the team behind the spacecraft to plan for Beresheet 2, a second mission to land on the moon.  The meetings, SpaceIL said, focused on setting the objectives for the future mission, completing the current investigation into the crash of Beresheet, setting a budget and recruiting resources and staff. SpaceIL hopes to complete the second mission within two years, the organization said.
The original mission budget stood at about NIS 350 million ($ 98m.), Almost entirely financed by private donors and costing a fraction of the missions sponsored by the governments of the three countries that have successfully reached the moon.
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