The pilot who survived the tragic crash of Virgin Galactic's SpaceShipTwo last month didn't know that his copilot unlocked the space plane's re-entry system early, investigators say.
SpaceShipTwo broke apart in midair during a test flight from California's Mojave Air and Space Port on Oct. 31, killing copilot Michael Alsbury and sending pilot Peter Siebold to the hospital. Alsbury apparently unlocked the vehicle's "feathering" system — which rotates SpaceShipTwo's tail booms upward to increase stability and drag during re-entry — too soon, investigators from the National Transportation Safety Board (NTSB) have said.
"According to the pilot, he was unaware that the feather system had been unlocked early by the copilot," NTSB officials wrote in an update today (Nov. 12).
"His description of the vehicle motion was consistent with other data sources in the investigation," they added. "He stated that he was extracted from the vehicle as a result of the break-up sequence and unbuckled from his seat at some point before the parachute deployed automatically."
SpaceShipTwo's feathering system is designed to deploy only after two actions are taken; a lever must be moved to the the "unlock" position, and then a handle must be shifted to the "feather" position. On Oct. 31, the system apparently deployed even though the second action didn't occur (the handle wasn't moved to "feather"). In a news conference earlier this month, Hart referred to the deployment as "an uncommanded feather."
That's how things will work when SpaceShipTwo is up and running. But the spacecraft remains in test mode for now; the Oct. 31 mission was SpaceShipTwo's fourth rocket-powered flight test, and its 55th test flight of any kind.
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