What should be done if an anti-icing system overtemperature message is displayed?

If an anti-icing system overtemperature message is displayed, shutting down the APU is the appropriate response to ensure safety and prevent potential damage or malfunction of the system. The anti-icing system is critical for maintaining the proper functioning of various components in cold weather conditions. An overtemperature condition indicates that the system may be at risk of overheating, which could lead to failures or hazards if not addressed promptly.

Executing a shutdown helps to immediately eliminate the risk of further temperature increase and allows for a full assessment of the situation before restarting the system. This proactive approach minimizes the chance of sustaining damage that could affect the aircraft's performance or safety during operations.

Other approaches, such as ignoring the message or adjusting settings, do not adequately address the potential risks associated with an overtemperature warning, and routine checks, while important for maintenance, may not be sufficient in an emergency situation requiring immediate action.