Thanks CoolP. As far as entry points, I just select a 707 model and place the plane at an airport and I see the problem. Very simple, nothing special. It sounds like Mark has seen an aspect of what is happening. Seems to be a bug where a inconsistent number of parameters are reset to default when you make changes to weather or fuel. I also find that if I have flaps down at the time, they will go up. I have reloaded 1.3 without the BOAC 300C and still see the problem. The inconsistency is interesting.