What adjustment must be made to the Minimum Descent Altitude (MDA) or Decision Altitude (DA/H) according to the Nav Aid rule?

The necessity to add 400 feet to the Minimum Descent Altitude (MDA) or Decision Altitude (DA/H) stems from the specific requirements outlined by the Nav Aid rule, which is designed to enhance safety during the approach and landing phases of flight, particularly when operating with certain navigational aids. This adjustment reflects operational practices that take into account factors such as terrain, obstacles, and the precision of the navigation equipment being utilized.

The addition of 400 feet to MDA or DA/H is a standardized practice that ensures pilots maintain a safer margin above the elevation of obstacles and terrain, allowing for a more conservative approach during these critical phases of flight. By increasing the altitude, the standard prioritizes safety and situational awareness, which are essential in today’s complex flight environments.

While there are other altitude adjustments associated with different operating conditions or regulations, the specific focus on adding 400 feet according to the Nav Aid rule underscores the importance of adhering to established protocols to foster a culture of safety and precision in aviation operations.