Which is the first step in the process of positioning an aerial device?

The first step in positioning an aerial device involves releasing the hold-down locks. This action is crucial because the hold-down locks are mechanisms that secure the aerial device in place while it's in transit. Before any movement or positioning can take place, these locks must be disengaged to allow the aerial device to function properly. This step is foundational, as it ensures that the device is free to rotate, elevate, or lower as needed, thereby enabling the operator to maneuver it safely and effectively.

In contrast, checking the path and elevating, rotating, or lowering the aerial device are subsequent actions that depend on the release of the hold-down locks. These steps can only be performed once the device is ready to operate and securely positioned, underscoring the importance of releasing the locks as the initial action in the positioning process.