When level at MDA on a non-precision approach, what is the minimum possible clearance between the aircraft and ground/obstruction?

When an aircraft is at Minimum Descent Altitude (MDA) during a non-precision approach, it must maintain a minimum vertical clearance to ensure a safe margin above the ground or any obstacles in the vicinity. The minimum clearance requirement is typically set at 250 feet above the highest obstacle in the approach path. This separation is crucial for safety because it provides a buffer that accounts for variations in terrain and ensures that the aircraft can safely navigate the final approach to landing.

In non-precision approaches, the absence of precision guidance means pilots need to be especially vigilant about terrain and obstacle clearance, which is why the 250-foot minimum is established. This helps mitigate risks associated with misjudgments during the descent and transition to landing. Additionally, knowing this minimum allows pilots to make informed decisions regarding their landing approaches, particularly when visibility and situational awareness may be compromised.