I have a little problem with carburettor heat and alternate air, I can get the actual value (CARB_HEAT, RECIP_ENGINE#_CARB_HEAT_POS, RECP_ENGINE1_ARLTERNATE_AIR_POS), but I can't find any KEY event to set the value from a gauge.What is carburettor heat key event??Thanks

The only events even close to this would be the ice stuff. The icing conditions met in FS2002 is just plain silly though. Let me know if you have any luck with these, I'm bound to end up looking for them myself one day (when I get that far in my panel).