Suitability and compatibility of materials and hardware used for maintenance

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

Practice AM.I.E.K9 out loud, free

What the ACS says

Suitability and compatibility of materials and hardware used for maintenance.

A sample oral question on this element

“Before you substitute a metal in a structural repair, what must you keep in mind?”

Study source: FAA-H-8083-30B (Aviation Maintenance Technician Handbook, General), chapter 7, pages 7-11, 7-12

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.E.K9 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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