What condition must a boom stage be in to determine the load capacity of the digger derrick?

To determine the load capacity of a digger derrick, the boom stage must be extended. When the boom is extended, it allows for the accurate calculation of the load capacity based on the specific angle and length of the extension. This reflects the actual working condition under which the digger derrick will be operating when lifting loads.

When the boom is fully extended, it's crucial for assessing the maximum weight that the machine can handle safely without risking instability or tipping. This capacity is determined according to the derrick's specifications, which take into account the boom's angle and reach. Failure to fully extend the boom might lead to an underestimation of the load capacity, resulting in unsafe operation practices.

Partially retracted or fully retracted positions do not accurately represent the configurations and stress factors that will be encountered in actual lifting scenarios. Therefore, assessing load capacity requires the boom to be in an extended position to ensure safety and reliability.