What is the recommended procedure for checking the automatic transmission fluid in aerial apparatus?

The recommended procedure for checking the automatic transmission fluid in aerial apparatus is a hot check. This method is crucial because the transmission fluid expands and circulates when the engine is warm, providing a more accurate reading of the fluid level and condition. A hot check typically involves running the engine to operational temperatures, allowing the fluid to flow through the system properly, and then checking the transmission fluid level using the dipstick.

This ensures that the fluid is at the correct operating temperature, allowing for accurate measurements and assessments of the fluid's quality, including its color and smell, which can indicate its condition and whether it needs to be changed. Conducting a hot check helps ensure that the aerial apparatus operates efficiently and safely, avoiding potential transmission issues that could arise from incorrect fluid levels or contaminated fluid.

Cold checks, visual checks, and periodic checks do not provide the same level of accuracy, as they may not account for fluid expansion or circulation, which is significant in determining the operational readiness of the transmission system.