In what configuration must a rough terrain crane operate when using the load capacity chart on rubber?

When utilizing the load capacity chart for a rough terrain crane while operating on rubber, the correct configuration is to have all outriggers extended with the tires remaining on the ground. This configuration is crucial because it provides stability and distributes the load effectively, ensuring the crane can operate safely and efficiently without risking tipping or compromising its load capacity.

Extending the outriggers increases the base of support and stabilizes the crane, allowing it to handle heavier loads while on rubber tires. The tires must remain on the ground to maintain traction and distribute the load evenly, which is essential for safe operation in rough terrain. This setup allows the crane to have maximum load capacity as indicated in the load chart.

In contrast, having all outriggers retracted would not provide adequate stability, and taking the tires off the ground or having all tires in the air would compromise both safety and load capacity, leading to instability and increasing the risk of accidents during operation.