ACS codes · Powerplant · Ignition and Starting Systems
AM.III.H.K4 · Knowledge
Three electrical circuits of a magneto system
Updated October 25, 2026 · element text from the FAA Aviation Mechanic ACS (FAA-S-ACS-1)
Practice AM.III.H.K4 out loud, free
What the ACS says
Three electrical circuits of a magneto system.
A sample oral question on this element
“Walk me through the circuits that make up a high-tension magneto system.”
Study source: FAA-H-8083-32B (Aviation Maintenance Technician Handbook, Powerplant), chapter 4, pages 4-2, 4-3, 4-4, 4-5, 4-6, 4-7
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.III.H.K4 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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