What action should be taken if the pressure gauge indicates abnormally high readings during operation?

When the pressure gauge indicates abnormally high readings during operation, inspecting for blockages is the most appropriate action to take. High pressure can signal that there is an obstruction in the spray system, which can lead to a dangerous situation if not addressed. Blockages can happen in various parts of the spraying equipment, including the nozzles, hoses, or filters, and can affect the efficiency and safety of the aerial application process.

By inspecting for blockages, the operator can identify the source of the high pressure and take appropriate steps to clear it. This helps maintain optimal functioning of the equipment and prevents potential damage or malfunction that could arise due to the increased pressure.

The other choices — reducing speed, increasing spray volume, or shutting down the engine — do not directly address the potential cause of the high pressure. While these actions may be temporary measures or safety protocols, they do not resolve the underlying issue that high pressure readings indicate. Therefore, promptly inspecting the system for blockages is critical for safe and effective aerial application.