How can you exceed the maximum permissible mass and it still be permissible?
Indeed; I'd always thought it was to do with, amongst other things, the bending moment at the wing root. Not wanting the wings to clap hands as you lift of I would have expected it to be a strictly adhered to limit.
ZFW is a fixed weight. It is static and can not change: I'm assuming the wings are full and thus no allowance for centre tank fuel etc. Let's KISS.
So back to av8tor94. Will you lease go back to the Line Checker and ask for an explanation and then enlighten us.