Which of the following steps comes after starting the engine when operating an aerial apparatus?

The step of observing the apparatus's gauges comes after starting the engine because it allows the operator to assess the operational status of the vehicle before proceeding with any further actions. Gauges provide critical information regarding engine temperature, oil pressure, fuel levels, and other vital performance indicators that can affect safety and performance. By checking these gauges immediately after starting the engine, the driver/operator can ensure that the apparatus is functioning optimally and identify any potential issues that need to be addressed before engaging in operations.

Understanding the condition of the apparatus at this stage is crucial for safe and effective operation. This proactive measure helps in confirming that everything is in working order, which ultimately supports the overall readiness of the crew and upholds safety standards during emergency responses.