What must a pilot ensure before landing an aircraft from an instrument approach?

For a pilot approaching to land from an instrument approach, ensuring that flight visibility meets or exceeds the visibility prescribed in the approach procedure is critical. This requirement is fundamental because it directly affects the pilot's ability to safely navigate and execute the landing. The visibility minimums set within the approach procedures are established based on safety considerations, ensuring that pilots can see the runway or necessary visual references during the approach. Meeting these minimum visibility requirements allows pilots to effectively gauge their altitude and position relative to the runway environment, which is essential for a safe landing.

Although other considerations like visual indicators and overall flight visibility are important, they do not replace the primary requirement of ensuring the visibility as outlined in the specific approach procedure. The intent of setting these visibility minimums is to enhance safety, allowing pilots to spot obstacles and effectively align with the runway threshold as they land.