What is typically not a routine action that controllers perform during preventive control?

Approving pilot actions routinely is generally not considered a routine action performed during preventive control. Preventive control primarily focuses on monitoring and managing air traffic to ensure safety and efficiency in operations. In this context, controllers regularly monitor traffic conditions to assess the current state of air traffic, provide traffic advisories to keep pilots informed about surrounding aircraft, and issue emergency instructions if necessary to address urgent safety concerns.

However, the approval of pilot actions typically occurs in response to specific requests, such as individual clearances or deviations. This process is more situational and relies on the dynamic nature of air traffic, which means controllers might not routinely approve actions outside of specific circumstances. Therefore, the role of approving pilot actions does not fit into the regular, preventive measures that are consistently executed in air traffic control operations.