NTSB says the feathering mechanism operated when the pilot unlocked it – by itself – was not supposed to actuate until the pilot commanded it to. They also said they have found the rocket motor intact.
So might not be the new engine’s fault at all !
Great video interview of Doug Messinger and the photographer who witnessed and photographed the accident onparabolicarc.com
Also saw that Virgin Galactic says the 2nd SS3 is 65% complete and can be ready to go by next year.