ACS codes · Airframe · Aircraft Instrument Systems
AM.II.H.R1 · Risk management
Use of pressurized air and water during maintenance or cleaning of aircraft instrument…
Updated October 25, 2026 · element text from the FAA Aviation Mechanic ACS (FAA-S-ACS-1)
Practice AM.II.H.R1 out loud, free
What the ACS says
Use of pressurized air and water during maintenance or cleaning of aircraft instrument systems.
A related practice question from DMEReady
“How should you handle and care for aircraft instruments?”
Study source: FAA-H-8083-31B (Aviation Maintenance Technician Handbook, Airframe), chapter 10, pages 10-76, 10-77
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.II.H.R1 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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