What portable tool is typically used when the main aerial device cannot reach a portion of the building?

The portable tool typically used when the main aerial device cannot reach a portion of the building is the pole ladder. This type of ladder is specifically designed for firefighters to extend their reach without the need for a truck or aerial apparatus. Its configuration allows for quick deployment and maneuverability, which is essential in emergency situations where access to higher levels of a structure is required.

Pole ladders are particularly useful in tight spaces or when obstacles prevent the use of larger aerial devices, making them a vital component of firefighting operations. Their design often includes features that enhance safety and stability, ensuring that firefighters can perform their duties effectively and safely.

In contrast, extension ladders, fire escape ladders, and step ladders have specific applications and limitations that may make them less suitable in certain scenarios where a higher or more flexible reach is necessary.