Which altitude is considered when visual descent points are utilized?

When utilizing visual descent points, the concept of Minimum Descent Altitude (MDA) is critical. The MDA is the lowest altitude that a pilot can descend to during an approach without visual references necessary to continue safely to a landing. It is established to ensure that pilots have a defined altitude to use when visual references are not yet available.

Visual descent points are specific locations on the approach path where the pilot may begin a descent if visual reference has been established—indicating clear sight of the runway or approach area. The MDA acts as a safety buffer, ensuring that the aircraft remains at a safe altitude until the pilot can acquire the necessary visual cues to proceed further with the descent and landing.

This altitude is particularly significant in precision approach procedures, as it reflects the minimum safe altitude that accounts for obstacles and terrain. Without this altitude, pilots would lack a clear guideline on how low they can descend during critical phases of flight when visibility is limited.