Yes, #3 engine is the first one started. The ATM is NOT on. The GTC is pressurizing the manifold to about 36-39PSI. I know.... If I had an APU, we wouldnt have this problem. In this heat, thats all the GTC will put out and thats the same on our other planes. I agree, the hot air and elevation is the name of the game... Its just too bad the T.O's dont says that. Dont know how to fix it?