On an LNAV approach, what is the Minimum Decision Altitude (MDA)?

The Minimum Decision Altitude (MDA) on an LNAV approach is typically set between 300 to 500 feet above the runway threshold. This altitude is crucial for pilots because it defines the lowest height at which they can descend during the approach while still requiring visual references to continue the approach process safely.

At this altitude, pilots must be able to see the runway or approach lighting to descend further to land safely. Hence, the choice of MDA between 300 and 500 feet aligns with standard aviation regulations and practices for LNAV approaches, ensuring that pilots have adequate height to make safety decisions regarding landing or executing a missed approach if the runway is not visible within the required parameters.