850lbs is right up with Mutt's modus operandi to plan an airline trip to Hawaii with five passengers to make the fuel limitations..
Nope, we don't use Honeywell FMS Manuals as flight planning tools..... the picture was to educate YOU about BEW and BOW....... but as usual you use something like this to divert the discussion rather than focusing on the pertinent points..... poor show
Known ZFW as some type of 'good enough' is beyond silly..because that is taking blind faith that the passenger load is correct, and that it has been correctly added to a correct BEW/BOW...again beyond silly.
Have you ever seen a DCS LOADSHEET? Do you know the role of a LOAD CONTROLLER?
In the words of GB Shaw,
Beware of false knowledge; it is more dangerous than ignorance............
Mutt