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Radio communicationsQuestion 808 of 934

When should an aircraft's transponder operate in the altitude reporting mode while on the ground at an airport?

  1. Only at airports that have an operating control tower or FSS
  2. Only after the aircraft is cleared for takeoff
  3. Any time the aircraft is on the airport movement area
  4. Only when the pilot sees conflicting traffic
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Correct answer: Any time the aircraft is on the airport movement area

Aircraft should operate the transponder in altitude reporting mode at all airports whenever on any part of the movement area.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 4-1-20 Transponder and ADS-B Out Operation, page 221

Practice radio communications

Questions last reviewed: 18 October 2026