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SESK: Stuff Everyone Should Know · sesk.info/pilot-transponder-on-movement-area

How should a transponder normally be operated while taxiing on an airport movement area?

Use the altitude reporting mode.

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  1. In standby
  2. With altitude reporting off
  3. In altitude reporting mode ✔

Why: The FAA says to use altitude reporting on airport movement areas, including taxiways and runways. This helps surface surveillance systems identify the aircraft.

Huh, didn't know that: ADS-B Out should also remain enabled on the movement area when equipped.

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Why did the transponder speak up on the taxiway? It wanted to be seen.
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References

Answer: In altitude reporting mode. The FAA says to use altitude reporting on airport movement areas, including taxiways and runways. This helps surface surveillance systems identify the aircraft.

  1. FAA AIM 4-1-20, Transponder and ADS-B Operation www.faa.gov/Air_traffic/publications/atpubs/aim_html/chap4_section_1.html
    operate with the transponder in the altitude reporting mode
    Checked 2026-10-09.

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