As aerial extensions increase, what must be decreased?

As aerial extensions increase, the load on the aerial device must be managed carefully. Increasing the aerial extension places additional demands on the structural integrity of the apparatus due to the mechanics involved in supporting the weight at greater heights. Therefore, to maintain safety and stability, the aerial loading must be decreased.

This means that as the height of the aerial device increases, the weight it can safely carry is reduced. This is crucial to avoid overloading the aerial device, which can lead to failures or accidents during operations, potentially endangering firefighters and civilians alike.

In contrast, options such as ground support, water pressure, and rescue time do not directly correlate with the increase of aerial extensions in the same manner. Ground support refers to the apparatus's stability, which is generally not reduced with height increases but instead must be sufficiently equipped to handle the load. Water pressure is more related to firefighting effectiveness rather than aerial operation. Rescue time pertains to the efficiency of rescue operations but does not have a direct link to the physical expectations placed on the aerial apparatus as it extends.