Look in your techlog at the details of its latest weighing and you will find the answer there. For the longitudinal it will specify the helicopters weight and it's datum ie the start point from which you start the calculation. However I have never seen a start point for the lateral arm ie. they seem to always presume that the aircraft starts at zero BUT as the start point is not specified the ACTUAL lateral cannot be calculated only one given a presumed starting point and what use is that?
Therefore my answer has always been that it cannot be calculated....and I've never got into trouble for that
