What action should be avoided when taxiing in the presence of volcanic ash?

When taxiing in the presence of volcanic ash, it's crucial to avoid taxiing fast because rapid movements can stir up the ash, creating a cloud that can obstruct visibility and settle into critical components of the aircraft, such as the engines and brakes. This can lead to potential mechanical failures or other hazardous situations.

While coming to a full stop might seem problematic, it's necessary in certain contexts to ensure safe operations and prepare for any necessary precautions against the ash. Therefore, focusing on maintaining a careful and controlled taxi speed is paramount to reduce the risks associated with volcanic ash. Understanding the dynamics of volcanic ash and its effects on aircraft operation is essential for ensuring safety during ground operations in affected areas.