What determines if an airport is qualified for alternate use regarding final approach NAVAIDs?

For an airport to qualify for alternate use concerning final approach NAVAIDs, the NAVAIDs must be unmonitored. This requirement is in place because unmonitored NAVAIDs can be used reliably under specific regulations, allowing for continued information on the navigational aids without the necessity for constant oversight. If the NAVAIDs are monitored, they may indicate a greater complexity and operational limitation at the airport, which could hinder the ability to qualify the facility as an alternate airport under certain weather conditions or operational statuses. Therefore, the unmonitored status of the NAVAIDs is a critical factor in assessing the reliability of the approach and ensuring that appropriate alternatives are accessible for aircraft during unpredictable circumstances.