Roger Roger
Bottom of the list
the LR45 is that way, I can’t remember the 31….might have been on the regular probe switchWe were in a CJ3 and had a thick layer of ice build-up at FL430 through the top of a cloud we couldn't get around at our TOD. The problem was it was too cold to pop the boots on the tail.
As for the engine probes, I know the Hawker 800 and the Challenger 604 both need the cowl heat on to heat the T2 probes.