What chart must an operator refer to when operating a rough terrain crane with all tires firmly planted?

When operating a rough terrain crane with all tires firmly planted, it is essential to refer to the chart for operating on rubber. This chart provides critical information regarding the crane's lifting capacity and stability when it is on its tires, which is the case when the crane is used in rough terrain conditions.

Operating on rubber ensures that the crane's weight distribution and support are properly managed, allowing for safe and effective lifting operations. The specific capacity limits and load charts that involve the crane's tires take into account factors like the crane's design, the type of tires, and the surface conditions, which directly influence the crane's operational safety.

Charts for extended outriggers, operating on soft ground, and wind conditions would not apply in this scenario because they address different operational circumstances. Extended outrigger charts would be relevant if the crane was utilizing its outriggers for stability, while soft ground charts deal with setups on ground that cannot bear the weight adequately. Wind condition charts are essential for operations affected by environmental factors but do not pertain to the situation where the crane is firmly on its tires. Therefore, referencing the chart for operating on rubber is the correct approach for ensuring safety and operational efficiency in this context.