Practice question

What obstacle clearance is guaranteed by a Minimum Sector Altitude (MSA) published on an instrument approach chart?

  1. 500 feet within 10 NM radius
  2. 1,000 feet obstacle clearance within a 25 NM radius of the navigation facility
  3. 2,000 feet within 50 NM radius
  4. 100 feet above highest airport structure

Answer: B — 1,000 feet obstacle clearance within a 25 NM radius of the navigation facility

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