TOPCAT warns about extra weight for take-off

[Nike Hercoles 0]

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

[metalmike 34]

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

[downscc 1,327]

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

[Nike Hercoles 0]

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