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SpaceIL’s investigation into the landing failure of its Beresheet lunar spacecraft now suggests that a ground command to reactivate a balky inertial measurement unit (IMU) might have caused the main engine to shut down.
A command intended to correct a malfunction in one of the Beresheet spacecraft’s inertial measurement unit (IMUs) led to a chain of events which turned off its main engine during landing, according to a preliminary investigation conducted by SpaceIL.
…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, rendering a crash-landing on the Moon inevitable.
It is still unclear how a command to one shut down the other, but the investigation is still on going. I suspect they will pin this down to a software design issue.