I am curious how weights are figured for weight & balance data on jets in the US with, say 100 or more seats. I realize each aircraft is different, but in general;
1) Do you assume the FAA "standard person" at 170 lbs. per pax?
2) Is all luggage weighed before it is loaded, or is there a generic figure assumed per bag?
I know F/A's often take a head count of pax in each compartment.
3) Are there estimates generated by dispatch based on the expected # of pax for a particular flight?
4) Is the head count used to fine tune the #'s prior to departure? (Actual # of pax on board might be different than expected).
I was wondering about how accurate the numbers need to be for determining things like takeoff trim settings, flap settings, V speeds, required runway, etc.
Sorry if this has been discussed before. I did a search on this forum, but didn't see this kind of discussion.