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Radio communicationsQuestion 257 of 934

A pilot changes the transponder from code 2700 to code 7200. How should the pilot do this to avoid a false alarm?

  1. Switch to 2200 first, then to 7200
  2. Switch to 7700 first, then to 7200
  3. Switch to 7500 first, then to 7200
  4. Switch to 7600 first, then to 7200
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Correct answer: Switch to 2200 first, then to 7200

Codes 7500, 7600, and 7700 trigger alarms in automated ground facilities. Avoid selecting them during routine changes.

Source: Aeronautical Information Manual (FAA, Basic with Change 3, 9 July 2026), AIM 4-1-20 Transponder and ADS-B Out Operation — Code Changes, page 223

Practice radio communications

Questions last reviewed: 18 October 2026