Under which condition is a missed approach required?

A missed approach is required when the aircraft is not stabilized. This means that the aircraft is not in a condition that allows it to safely continue its approach to landing. A stabilized approach generally involves the aircraft being on the correct path, at the appropriate speed, and in a proper configuration for landing. If any of these factors are not met, the pilot must perform a missed approach to avoid a potentially unsafe landing scenario.

Being below the minimum altitude pertains to regulatory compliance and safety, but simply being below an altitude does not immediately necessitate a missed approach if other factors are stable. While having other aircraft in the vicinity is a consideration for maintaining safe operations, it does not directly require a missed approach unless it impacts the safety of the landing. A pilot's request for a missed approach can happen for various reasons, including personal preferences or adjustments, but it is not inherently a condition that necessitates one. A missed approach is fundamentally about ensuring safety by maintaining the proper conditions for landing.