I believe you should change the landing test
force_b >0 should be more like : force_b <0.1
otherwise the output is true for t < 1.2 s
this seems to work on my side :
function is_landed = fcn(altitude, force_b)
if altitude >= 0 && force_b <0.1
is_landed = true;
else
is_landed = false;
end
