*Pictures the feathering, under power, at more-or-less Mach 1..... *shudders
Any airframe would have broken up under those circumstances. If this has indeed been the case, there will be Serious Questions asked how this would have been even possible, even *if* the safety was off and the manual command given. You'd expect the feathering actuators *and* their controls to be locked down completely on engine burn. You know.. just to be sure.. Because Murphy.