What is used when RT crane outriggers are not fully extended?

When the outriggers of a rough terrain (RT) crane are not fully extended, it is important to refer to the on rubber capacity chart. This chart provides specific operating capacities for situations when the crane is on its tires, rather than when it is stabilized by the outriggers.

Using the on rubber capacity chart is crucial because it takes into account the fact that the crane's stability and lifting capability are significantly different when it is not fully supported by outriggers. The weights and reach that the crane can manage in this state are reduced compared to when it is fully extended, which ensures safety and helps prevent tipping or accidents during operation.

The other options, such as the standard load chart, partial extension chart, and heavy load rating chart, do not specifically address the unique conditions of operating without fully extended outriggers. The standard load chart typically assumes that the crane is fully set up and stable. The partial extension chart might not be applicable to RT cranes as it generally pertains to other crane types with different setups. The heavy load rating chart is designed for specific high-load scenarios, rather than directly addressing the reduced capabilities of a crane operating without the full support of its outriggers.