ACS codes · Airframe · Communication and Navigation Systems
AM.II.I.K15 · Knowledge
Ground proximity warning system (GPWS) theory, components, and operation
Updated October 25, 2026 · element text from the FAA Aviation Mechanic ACS (FAA-S-ACS-1)
Practice AM.II.I.K15 out loud, free
What the ACS says
Ground proximity warning system (GPWS) theory, components, and operation.
A sample oral question on this element
“What unsafe conditions does the GPWS detect?”
Study source: FAA-H-8083-15B, chapter 5, page 5-34
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.I.K15 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.
Answer by voice, get follow-up questions and a report tied to FAA handbook pages. No account needed for the free practice. DMEReady is an independent study tool, not affiliated with or endorsed by the FAA.