Itt is the most critical part of the PT6. The Tip clearance at the CT wheel is were the damage will be done. As your clearance is increased your power will decrease causing more fuel for a given Tq. This is what the original problem in this thread is about. If you over temp you can get blade creep then this will pick up on the ct segments and then your clearance will get larger and larger as more metal is transposed from one side to the other, and a over $1000 per blade and 72 of them im cause your employer will love you heaps