What area does the Minimum Safe Altitude (MSA) cover, and what obstacle clearance does it provide?

The Minimum Safe Altitude (MSA) is designed to ensure safe navigation for aircraft in the vicinity of an airport or specific navigational aids. The primary purpose of the MSA is to provide a margin above obstacles in the area to avoid collisions while allowing for safe maneuvering in case of emergencies.

In this context, the correct answer indicates that MSA covers an area of 25-30 nautical miles from the reference point, and it provides a clearance of 1,000 feet above the highest obstacle in that area. This altitude ensures that aircraft are operating at a safe distance above terrain and potential obstructions, promoting operational safety.

This altitude and coverage distance are crucial in emergency situations, enabling pilots to navigate safely without the immediate risk of encountering obstacles. The choice of 1,000 feet of clearance aligns with regulatory standards that help maintain safe airspace operations.