@littgo: any KingAir I flew/fly needed an effort to go from low RPM to feather. (creeping from high to low rpm is another story)
OTOH, going fro 2000 Revs to 1600 quickly at T/O power could destroy the gears between engine and prop (overtorque). That would be fairly easy to find out from the wreckage I think...
what the certification requirements of a B200 with one engine going quiet at rotation are...?
Thats easy, its an FAR 23 airplane... this airplane from the pics I saw was not Raisbecked and equipped with the old 3 blade props - this means a significant worse OEI/higher VMCA performance compared to a Raisbeck version. The 3 bladers often do not have autofeather - that was an optional, is mandatory with the Raisbeck Hartzell 4 blades. (and IIRC with the standard McCauley 4 bladers of the newer aircraft)
King Air B200
Distance over 50 ft 3300 vs 2760 ft, Acc-Go 6370ft vs. 3990ft (or 4390 with high floatation gear with Raisbeck fully enclosing gear doors)