Which is the first step when starting the aerial apparatus?

The first step when starting the aerial apparatus involves ensuring safety and readiness for operation. Disconnecting all auxiliary electrical and air sources is crucial because it prevents any unintended activation of equipment that could lead to accidents or equipment damage. This step is part of a safety protocol to ensure that the apparatus is in a stable condition before proceeding with the engine start process.

Once all auxiliary systems are disconnected, you can confidently check other systems and proceed with starting the apparatus. This approach helps to maintain control over the vehicle and its functions, ensuring that everything operates as expected. Consequently, initiating the sequence with proper safety measures lays a solid foundation for handling the apparatus effectively.