To prepare the aerial apparatus for testing after an engine speed check, you should?

After conducting an engine speed check on an aerial apparatus, it is necessary to make the pump operational to ensure the aerial device is ready for testing and that it can perform its primary functions effectively. Making the pump operational allows you to verify that it is functioning correctly, as the pump plays a critical role in fire suppression and other operational tasks during emergencies.

While performing a full inspection, calibrating the navigation system, and checking tire pressure are all important maintenance tasks for an aerial apparatus, they are not the immediate priority following an engine speed check. The pump's functionality is essential for the apparatus’s readiness, so ensuring that the pump is operational is the most relevant step in the preparation process following the engine check.