MSA provides obstacle clearance within what radius?

MSA provides obstacle clearance within what radius?

• A. It provides obstacle clearance outside a 25 NM radius
• B. It provides obstacle clearance within a 25 NM radius
• C. It is 50 NM radius
• D. It does not relate to terrain elevation

Answer: (B)

MSA defines the altitude needed to guarantee obstacle clearance inside a specific circle around a navigation aid. That circle has a radius of 25 nautical miles. Within this 25 NM zone, the minimum altitude shown as MSA ensures you have safe clearance over terrain and obstacles, making it a reliable reference when flying near the nav aid. It’s not about a larger radius or outside the circle, and it does relate to terrain elevations because the purpose is to maintain obstacle clearance.

MSA defines the altitude needed to guarantee obstacle clearance inside a specific circle around a navigation aid. That circle has a radius of 25 nautical miles. Within this 25 NM zone, the minimum altitude shown as MSA ensures you have safe clearance over terrain and obstacles, making it a reliable reference when flying near the nav aid. It’s not about a larger radius or outside the circle, and it does relate to terrain elevations because the purpose is to maintain obstacle clearance.