Which features provide automatic locking capabilities on most aerial apparatus?

Automatic locking capabilities on most aerial apparatus are primarily provided by holding valves and interlocks. Holding valves are designed to maintain the position of hydraulic systems, ensuring that aerial equipment remains securely in place, especially when elevated. This feature is crucial for safety, as it prevents unintended movement or collapse of the apparatus during operation.

Interlocks serve as a safety mechanism that ensures certain conditions are met before the machine can operate. For example, interlocks can prevent the apparatus from moving unless it is properly stabilized or secured, thus adding an additional layer of safety and automatic locking to the operation.

In contrast, anchor points and straps, safety chains and ropes, and brake systems and stabilizers, while they each play significant roles in the overall functionality and safety of aerial devices, do not specifically provide the automatic locking feature inherent to the hydraulic and mechanical systems utilized in aerial apparatus. Brake systems primarily control movement rather than lock it, and anchor points and safety chains are more about securing load stability rather than providing an internal locking mechanism.