Jay
I was landing at Appleton, WI one winter and on rollout the 421 began
to slew around. Brakes were useless and as I passed the 90deg point,
the tower says, "Caution - Black ice on all runways and taxiways.." I
ended up using differential power to get it stopped after turning 180
deg on the runway!!!
It was so slick on the ramp that I put down Kitty Litter near the
airstep door so my pax didn't slip and fall. Was too slick to hold
position while I tried to exercise the props before take-off. Nasty
ice.....