Hmmmm, I have 1000's of hrs in 250's and fly out of Montana and Wyoming. NEVER
once have I EVER picked up carb ice. Ever. I have never had to pull carb heat
on landing EVER! The 540 manual says don't pull carb heat unless you get carb
ice! (I thought that was why they ran the intake through the oil pan)?

In over 10 years of flying 250's I have never pulled carb heat. except on every
run up.

When I fly my 206 I pull carb heat for landing all the time. Hmmm, that's what
the Cessna book says to do.

Maybe I just got a good 540. But I know may of my 250 friends that must have
gotten good ones too, as they have never, ever had carb ice problems.

Ae