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Flight rulesQuestion 116 of 934

An airport is listed in Appendix D, section 1. Within what distance is a transponder required, from the surface to 10,000 feet MSL?

  1. 10 nautical miles
  2. 20 nautical miles
  3. 50 nautical miles
  4. 30 nautical miles
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Correct answer: 30 nautical miles

A transponder is required within 30 nautical miles of an Appendix D, section 1 airport, from the surface to 10,000 feet MSL.

Source: 14 CFR Part 91, § 91.215 ATC transponder and altitude reporting equipment and use.

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Questions last reviewed: 18 October 2026