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Radio communicationsQuestion 799 of 934

When does ATC surveillance radar show the altitude of an aircraft?

  1. Whenever the aircraft has a primary radar return and a working altimeter
  2. When the aircraft has Mode C and the radar facility can display altitude
  3. Only when the pilot reports altitude on every call
  4. Only when the aircraft flies above 10,000 feet MSL
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Correct answer: When the aircraft has Mode C and the radar facility can display altitude

Surveillance radar does not provide altitude unless the aircraft has Mode C and the facility can display altitude.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 4-1-15 Radar Traffic Information Service, page 214

Practice radio communications

Questions last reviewed: 18 October 2026