Minimum Safe Altitudes provide 1000 feet of clearance within 25 NM. Which of the following best describes this statement?

Minimum Safe Altitudes provide 1000 feet of clearance within 25 NM. Which of the following best describes this statement?

• A. You have 1000 feet of clearance above terrain or obstacles within 25 NM of the facility
• B. You have 1000 feet of clearance at all distances
• C. You have 1000 feet of clearance only beyond 25 NM
• D. It's not a standard rule for planning

Answer: (A)

Minimum Safe Altitude around a navigation facility guarantees 1000 feet of obstacle clearance within a 25 NM radius of that facility. So, your altitude must be at least 1000 feet above the highest terrain or obstacle inside that 25 NM circle. For example, if the highest obstacle within 25 NM is 4000 ft, you’d need to be at least 5000 ft MSL to meet this minimum. This safety margin is specifically defined for the area within 25 NM of the facility; it does not imply the same clearance at all distances, nor is it something you’d ignore in planning.

Minimum Safe Altitude around a navigation facility guarantees 1000 feet of obstacle clearance within a 25 NM radius of that facility. So, your altitude must be at least 1000 feet above the highest terrain or obstacle inside that 25 NM circle. For example, if the highest obstacle within 25 NM is 4000 ft, you’d need to be at least 5000 ft MSL to meet this minimum. This safety margin is specifically defined for the area within 25 NM of the facility; it does not imply the same clearance at all distances, nor is it something you’d ignore in planning.