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Which type of ADS-B Out equipment is required in Class A airspace, beginning at 18,000 feet MSL?

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  1. UAT on 978 MHz
  2. Either type, pilot's choice
  3. 1090ES on 1090 MHz

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References

  1. AIM Chapter 4 Section 5, Surveillance Systems www.faa.gov/air_traffic/publications/atpubs/aim_html/chap4_section_5.html Checked 2026-10-09.

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