ACS codes · Airframe · Communication and Navigation Systems
AM.II.I.K20 · Knowledge
Automatic Dependent Surveillance-Broadcast (ADS-B) theory, components, and operation
Updated October 25, 2026 · element text from the FAA Aviation Mechanic ACS (FAA-S-ACS-1)
Practice AM.II.I.K20 out loud, free
What the ACS says
Automatic Dependent Surveillance-Broadcast (ADS-B) theory, components, and operation.
A sample oral question on this element
“What advantages does ADS-B have over conventional ground-based radar for traffic separation and control?”
Study source: FAA-H-8083-31B (Aviation Maintenance Technician Handbook, Airframe), chapter 11, pages 11-57, 11-58, 11-59
If this code is on your test report
Your Airman Knowledge Test Report (AKTR) lists an ACS code for every knowledge area you missed on the written test. On the A&P oral, each of those codes adds one question to that section, on top of a minimum of four random questions (FAA Mechanic Test Generator FAQ). So if AM.II.I.K20 is on your AKTR, expect the examiner to ask about it. More on how codes turn into oral questions: A&P ACS codes: know your codes before the oral.
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