What is the first step in starting an aerial apparatus?

Starting an aerial apparatus involves a specific sequence to ensure safety and proper functionality. The first step, which involves disconnecting all auxiliary electrical and air sources, is crucial for several reasons.

When disconnections are made initially, it ensures that no unwanted power is sent to the aerial device or other systems, reducing the risk of accidental activation or malfunction during startup. This helps to prevent potential hazards such as inadvertent movement of the aerial ladder or extension systems while personnel are preparing to start the apparatus. It’s a preventative measure to ensure that everything is in a safe state before the engine is started, or any other systems are activated.

Once auxiliary systems are safely disconnected, the operator can then move on to other steps, like ensuring the apparatus's battery is ready, starting the engine, and making necessary adjustments to the seating and mirrors for safe operation.