Every helicopter has a maximum allowable take-off weight, which must not be exceeded so that the components in the helicopter are not overloaded and fail at some point due to material fatigue. For this reason, pilots must make various calculations before each flight to ensure that this maximum weight is not exceeded. This weight then includes not only the passengers, but also, for example, the pilot himself and the fuel in the tanks. In addition, additional calculations are made that are part of the flight preparation. The leverage effect determines which passenger is seated with which weight in which seat. Some helicopters also have specifications from the manufacturer. With the Robinson R44, for example, no passenger may weigh more than 130kg - a maximum of 6kg may be added as luggage. How much a passenger is allowed to weigh is stated on the respective location page and on the ticket.