Hi,

 

I have a problem regarding TOPCAT calculations for take-off in PMDG 777F.

The PFPX gives me the figures about ZFW , LW , ... which all are within limits and much lower than the related maximum ones. But when I export the flight plan to TOPCAT to compute the take-off performance it warns me " Perf.Limit Weight 248785 kg -Take-off weight ( 326099 kg) exceeds perf. limit weight ." I fill all boxes in TOPCAT such as  cargo , fuel ,wind , temperature , flap , ... .

 

Regards

You may technically be under your MZFW, MLW etc, but your runway length/OAT might not be sufficient for your weight.

Exactly, TOPCAT is telling you the performane weight limit so you have all the information you need.

So why PFPX or 777 FMC do not have such warnings?