Originally Posted by Dave Fitzgerald

I understand the difference. Yes, the airplane will tell on us too.

The calculated FMC weight at point of dispatch, which is advance the throttles on the runway for TO must be at or below MGTO.

Our flt management will hang us out to dry. Anything goes wrong, including something as stupid as hitting a bird on TO, they will pile on...."..and why did you TO over gross??"

Yes I understand we have no idea what the actual TO weight is. In fact, 3 SYD trips ago, I'm pretty sure we TO about 12-15k over gross. We did everything we could to save fuel, and still landed with less that planned. Oh it wouldn't climb worth beans either. Prove it? no way to do it. But, that FMC number is something you can point at and say....yeah, that's it!

So, to answer your question, it would be calculated. Unless you have some sort of fuel system anomaly, they want us to use calculated.