the aircraft was not overloaded. see below for that days flight
details:

helicopter : MI-8MTV
altitude : 3900m asl
air temperature : +5C
wind speed : 4m/s (upwing takeoff)
take-off mass :
* 16pax - 10444kg
* 11pax - 10069kg (after made 5 passengers get out/disembark)

so let me know how you decided that helicopter was overloaded.

- rustam