Sunday PM NTSB briefing:
- N2O oxidizer tank found intact
- SpaceShipTwo appear to have had an "uncommanded feather"
- In order to feather, normal procedures involve two steps: 1) co-pilot moves "feather lock" lever to unlock; 2) a second feather lever must then be operated to actually initiate the feather
- Procedure calls for "feather lock" lever to remain in "locked" position until Mach 1.4 due to aerodynamic forces. However the "copilot" unlocked the lever at around Mach 1.0. (reason unknown).
- The second lever was never operated. An "uncommanded feather" took place approximately 2 seconds after the feather unlock.
- After the uncommanded feather, SpaceShipTwo subsequently disintegrated.
- No determination of cause at this point