MSA ensures obstacle clearance around a VOR/airport.

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Multiple Choice

MSA ensures obstacle clearance around a VOR/airport.

MSA is the minimum safe altitude defined specifically to provide obstacle clearance in the vicinity of a navigation aid, such as a VOR or an airport. It is published as a circle (usually about 25 nautical miles) around the facility, and inside that area the altitude guarantees a certain amount of obstacle clearance (typically at least 1000 feet, or 2000 feet in mountainous terrain). Because of this purpose, the priority is to ensure you stay clear of obstacles near the VOR/airport, regardless of the route structure or signal reception elsewhere. So the correct choice is the one that describes obstacle clearance around a VOR/airport. The other options describe signal coverage along a route or general IFR altitude minima for routes, which are different concepts (MSA focuses on clearance near the facility itself, not along a route or about signal reception).

MSA is the minimum safe altitude defined specifically to provide obstacle clearance in the vicinity of a navigation aid, such as a VOR or an airport. It is published as a circle (usually about 25 nautical miles) around the facility, and inside that area the altitude guarantees a certain amount of obstacle clearance (typically at least 1000 feet, or 2000 feet in mountainous terrain). Because of this purpose, the priority is to ensure you stay clear of obstacles near the VOR/airport, regardless of the route structure or signal reception elsewhere.

So the correct choice is the one that describes obstacle clearance around a VOR/airport. The other options describe signal coverage along a route or general IFR altitude minima for routes, which are different concepts (MSA focuses on clearance near the facility itself, not along a route or about signal reception).

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