Dissimilar metals causing accelerated corrosion and role of protective barriers to…

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

Practice AM.I.G.K12 out loud, free

What the ACS says

Dissimilar metals causing accelerated corrosion and role of protective barriers to mitigate this risk.

A sample oral question on this element

“Why is keeping an aircraft clean important to a mechanic?”

Study source: FAA-H-8083-30B (Aviation Maintenance Technician Handbook, General), chapter 8, pages 8-23, 8-24

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.G.K12 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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