ACS codes · Airframe · Hydraulic and Pneumatic Systems
AM.II.F.K10 · Knowledge
Pressure regulators, restrictors, and valves
Updated October 25, 2026 · element text from the FAA Aviation Mechanic ACS (FAA-S-ACS-1)
Practice AM.II.F.K10 out loud, free
What the ACS says
Pressure regulators, restrictors, and valves.
A sample oral question on this element
“What is a pressure relief valve used for in a hydraulic system?”
Study source: FAA-H-8083-31B (Aviation Maintenance Technician Handbook, Airframe), chapter 12, pages 12-27, 12-28, 12-29
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.F.K10 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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