A broken bearing on the "shaker" used to vibration-test spacecraft at the Jet Propulsion Lab caused the mishap that left NASA's High Energy Solar Spectroscopic Imager (HESSI) with structural damage and a launch delay of undetermined duration, an agency mishap board reported. The $40 million spacecraft was subjected to about 20 Gs -- roughly 10 times that planned for in the March 21 test -- when a failed support bearing caused the shaker to shift on its mounting base. As a result, ...


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