Originally Posted by
Crossunder
Sooo... to provoke a bit: You can fly around with thick ice on the stab, land or make a single engine go-around with ice on the stab - but you cannot take off with a thin layer of ice on the stab? What's the difference?
Easy-peasy that one.
You demonstrate safe flight and landing with ice accreted in-flight (for unprotected surfaces). You don't demonstrate that you can safely rotate for takeoff.
You can do certain things, because the aircraft is designed with those taken into account. You cannot do things (well, certainly you should not try to) if the OEM didn't prove it was safe first.