AC and DC motors

Updated October 25, 2026 · element text from the FAA Aviation Mechanic ACS (FAA-S-ACS-1)

Practice AM.I.A.K27 out loud, free

What the ACS says

AC and DC motors.

A sample oral question on this element

“How do the basic types of DC motors differ from one another?”

Study source: FAA-H-8083-30B (Aviation Maintenance Technician Handbook, General), chapter 12, pages 12-141, 12-142

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.I.A.K27 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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