AS355F1 Cat A Clear Area 2400kg Cat A Helipad 2200kg
AS355F2 Cat A Clear Area 2400kg Cat A Helipad 2200kg
The Max T/O Mass of 2540 for F2 is unscheduled for Cat A i.e the extra 140kgs - but on a particular day you may be able to take off Class 2 at 2540kg and maintain CAT en route performance
I think!! UG