Martin,
Yes, I train/trained at Quantum and when conditions are not conducive, carb heat is always down and locked.
I understand at higher elevations and so forth but I thought that it was derated enough to avoid this as well. I guess I'm still new to all of this! I'm not knocking your procedures or anything, I'm just trying to better understand things. I have an unusual mind and I'm not happy until I fully understand the "why" aspect of things!