Minimum Safe Altitude provides obstacle clearance within what radius?

Minimum Safe Altitude provides obstacle clearance within what radius?

• A. 10 nm
• B. 25 nm
• C. 40 nm
• D. 5 nm

Answer: (B)

Minimum Safe Altitude is the lowest altitude that guarantees obstacle clearance within a defined area around a navigation aid. For standard MSAs, that area is a circle with a 25 nautical mile radius around the facility, and it provides at least 1000 feet of obstacle clearance (2000 feet in mountainous terrain) within that radius. The 25 NM radius is the reason this choice is correct. The other distances don’t correspond to the standard obstacle-clearing circle used for MSAs.

Minimum Safe Altitude is the lowest altitude that guarantees obstacle clearance within a defined area around a navigation aid. For standard MSAs, that area is a circle with a 25 nautical mile radius around the facility, and it provides at least 1000 feet of obstacle clearance (2000 feet in mountainous terrain) within that radius. The 25 NM radius is the reason this choice is correct. The other distances don’t correspond to the standard obstacle-clearing circle used for MSAs.