Astrobotic’s Lander Didn’t Make It To The Moon Because Of A Failed Valve

Arthur T Knackerbracket has processed the following story:

Seven months after its first lunar lander fell short of reaching the Moon, Astrobotic announced Tuesday that the spacecraft was stricken by a valve failure that caused a propellant tank to burst in orbit. The company's next landing attempt, using a much larger spacecraft, will include fixes to prevent a similar failure.

Astrobotic's first Peregrine lander, which the company called Peregrine Mission One, launched on January 8 aboard United Launch Alliance's first Vulcan rocket. But soon after separating from the rocket in space, the lander ran into trouble as it stepped through an activation sequence to begin priming its propulsion system.

A review board determined "the most likely cause of the malfunction was a failure of a single helium pressure control valve called a PCV-pressure control valve 2, within the propulsion system," said John Horack, a space industry veteran and professor of aerospace and mechanical engineering at Ohio State University.

Helium was supposed to pressurize Peregrine's propulsion system and force fuel and oxidizer from the lander's onboard storage tanks into the spacecraft's small rocket engines to combust and generate thrust.

"PCV2 suffered a loss of seal capability that was most likely due to a mechanical failure in the valve caused by vibration-induced relaxation between some threaded components that are inside the valve, so a failure deep inside the valve itself," said Horack, who chaired Astrobotic's investigation into the failure of the Peregrine lander.

It didn't take long for the valve malfunction to have catastrophic consequences for Astrobotic's Peregrine lunar lander, which was attempting to become the first US spacecraft since 1972 to achieve a soft landing on the Moon.

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