When a circling approach does not have a published ceiling, how can the required ceiling be determined?

In the context of circling approaches, when there is no published ceiling, the required ceiling can be determined by adding 100 feet to the height above airport (HAA) and rounding up. This method is rooted in ensuring adequate clearance over obstacles and maintaining safety during the maneuver.

Adding 100 feet provides a buffer that is consistent with safety standards, and rounding up ensures that even if the calculated height is close to a decision point or minimum requirement, pilots have an adequate margin. This practice is crucial in circling approaches, where visual references and obstacle avoidance are critical, especially during landing phases over varied terrain.

Determining a ceiling using this method aligns with established guidance and contributes to safe flight operations during procedures that lack definitive published minimums.