Astrobotic's Peregrine lander was unable to achieve a successful lunar landing due to a catastrophic failure related to a helium pressure control valve during activation.
A review board determined the most likely cause of the malfunction was a failure of a single helium pressure control valve within the propulsion system.
PCV2 suffered a loss of seal capability likely caused by vibration-induced relaxation between threaded components inside the valve, leading to a loss of control.
The failure of the pressure control valve resulted in uncontrolled helium flow into the oxidizer tank, causing catastrophic over-pressurization and the failure of the mission.
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