Other than the obvious poor planning....
A King Air has a pretty decent L/D once the props are feathered.
Don't
feather and it does come down, like right now. Depending on the
model,
L/D of King Air series can be anywhere from 13/1 up to about 17/1.
We could feather both on a KA90 (engines can still be running with
feathered props), slow to best L/D speed of around 110 knots, and the
sink would settle around 800fpm. Drop gear and approach flaps and
sink
would go to about 12-1300fpm. If you unfeathered the props then,
sink
could increase 4-5000 fpm, kind of like a 20 with full flaps and
spoilers...
The longer wing 200 series was actually better than a 90....
Ah, the old days....

Steve