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Flight rulesQuestion 117 of 934

A pilot flies at 11,000 feet MSL over the 48 contiguous states, well above 2,500 feet AGL. Is a transponder required?

  1. Yes, at and above 10,000 feet MSL and above 2,500 feet AGL
  2. No, a transponder is required only at or above 12,500 feet MSL
  3. No, a transponder is required only at or above 18,000 feet MSL
  4. Yes, but only when the flight is at night or in clouds
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Correct answer: Yes, at and above 10,000 feet MSL and above 2,500 feet AGL

A transponder is required at and above 10,000 feet MSL, excluding the airspace at and below 2,500 feet AGL.

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

Practice flight rules

Questions last reviewed: 18 October 2026