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US Private Pilot

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Flight rulesQuestion 115 of 934

In which airspace must an aircraft have an operable transponder with Mode C, unless ATC authorizes otherwise?

  1. In Class D airspace areas
  2. In Class G airspace areas
  3. In Class B and Class C airspace areas
  4. In all airspace below 1,200 feet AGL
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Correct answer: In Class B and Class C airspace areas

Section 91.215 requires a transponder in Class A, B, and C airspace, and in other named areas.

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

Practice flight rules

Questions last reviewed: 18 October 2026