Holger,You mean 19 or -19C (I cannot see it well) should be +19C, on the ground at KATL?Is Active Sky Evolution providing you with TAT = 19 to be entered into FMC INIT page?Edit:Previous post I mentioned:Holger,What value did you use for OAT?Did you do a screenshots of your FMC Perf init page(s) for us to look at?

Vaughan,I mean +19C!Best RegardsHolger!