Alternate routing

[easymxp]

Originally Posted by sonicbum

Mostly agree with the above comments. Just keep in mind that if your Operator SOPs do require to insert the routing to the alternate then you'd better be in the position of actually doing it. For example we do that, as we crosscheck the difference in the FMGC alternate fuel predictions vs OFP (Lido) for gross error checks.
When using the secondary to plan for an alternate routing, just use it as a reference for the distance to go and then use the Flysmart (or paper QRH/FCOM data if you're not no paper cockpit yet) to find official alternate fuel values. I mean, the secondary flight plan works perfectly fine, but the FMGC values are advisory in nature, hence for legality purposes you need a crosscheck with an approved piece of documentation.

Great advices!!!