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SESK: Stuff Everyone Should Know · sesk.info/pilot-mode-c-veil-30nm

The Mode C veil requires an altitude reporting transponder within how far of listed major airports?

30 nautical miles, from the surface to 10,000 feet MSL.

  1. 10 nautical miles
  2. 30 nautical miles ✔
  3. 20 nautical miles

Why: Rule 91.215 requires an altitude reporting transponder within 30 nautical miles of airports listed in Appendix D, section 1, mostly Class B airports. Since 2020, ADS-B Out is required in that same airspace.

Huh, didn't know that: Sectional charts mark the 30 NM Mode C area with a solid magenta line around the Class B airport.

The dad joke
Why did the airplane wear a veil? It was going to a Mode C wedding.
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Sources

  1. 14 CFR 91.215 ATC transponder and altitude reporting equipment (eCFR) https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-91/subpart-C/section-91.215
  2. 14 CFR 91.225 ADS-B Out equipment and use (eCFR) https://www.ecfr.gov/current/title-14/chapter-I/subchapter-F/part-91/subpart-C/section-91.225

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