Which elements of an aerial device should be visually inspected?

The selection of visual inspection elements for an aerial device focuses on components that are critical to the safe operation and functionality of the apparatus. The elevating platform assembly is essential because it supports firefighters and equipment at height, necessitating scrutiny for structural integrity and mechanical operation. Inspecting the ladder rungs ensures that they are secure and free from damage, which is vital for safe access and egress during emergencies. Additionally, checking the equipment attached to the aerial device, such as nozzles and safety devices, is important to ensure that everything is operational and will function correctly when needed.

While the other choices include important elements of the apparatus, they do not encompass the comprehensive and critical components specific to the aerial device's operation required for safety during deployment at elevated positions. Visual inspections must prioritize parts that directly affect user safety and performance in firefighting scenarios.