ACS codes · Powerplant · Engine Fire Protection Systems
AM.III.E.K4 · Knowledge
Fire extinguishing agents, types of systems, and operation
Updated October 25, 2026 · element text from the FAA Aviation Mechanic ACS (FAA-S-ACS-1)
Practice AM.III.E.K4 out loud, free
What the ACS says
Fire extinguishing agents, types of systems, and operation.
A sample oral question on this element
“What is the most common extinguishing agent still used in engine fire protection systems today?”
Study source: FAA-H-8083-32B (Aviation Maintenance Technician Handbook, Powerplant), chapter 9, pages 9-7, 9-8
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.E.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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