The aerial function controls on most aerial devices are connected to which system?

The aerial function controls on most aerial devices are primarily connected to the engine throttle. This connection is essential because it allows for direct control of the engine's power output, which is critical for the operation of the aerial ladder. When the aerial device is extended or maneuvered, adjustments to the engine throttle are necessary to maintain stability and ensure that the system operates efficiently under various loads and configurations.

By controlling the engine throttle, operators can effectively manage the aerial device's performance in terms of lifting capabilities and responsiveness to commands, ensuring safe and effective operation. This connection underscores the importance of the engine's power management in facilitating smooth movements of the aerial ladder during rescue or firefighting operations.

The other systems mentioned, while foundational to the vehicle's overall operation, do not specifically relate to the direct control of the aerial function like the engine throttle does.