Originally Posted by
Super VC-10
Bear in mind also that (despite Avherald not understanding the difference between the two) reverse and beta aren't synonymous.
A prop doesn't need to go fully into reverse to cause this kind of accident - anywhere in the beta range (that's to say below flight idle) will result in severe embarassment if it's applied on one side only of a twin.
If the cause turns out to be a failure of the pitch change mechanism, that will typically result in the forces on the blades tending to fine them off, with a consequent massive increase in drag on that side and potentially catastrophic results unless the prop can be quickly feathered.