8che,
Thanks, this is exactly what Im after.
Just to be clear you are saying that the OPT will provide factored data for the dispatch calculation (appropriate to the input of wet/dry rwy), but the enroute data will be unfactored.
This means that when doing an OPT enroute calc I need to add the 1.67/1.92 factor to the advisory landing distance before comparing with the LDA?
I know that this sounds like basic stuff but I cant find any reference to it in the FCOM/QRH/EFB user guide. If someone has a reference from a 777 manual I would very much appreciate it!
Cheers,
Blah