Airworthy PrepA&P Airframe test code
AM.II.I.K21Communication and Navigation Systems
A&P Airframe test (Section II), subject I
Written as am.ii.i.k21 or AM.II.I.K21 on your score report.
The FAA's wording
Transponder/encoder system.
What it means
AM.II.I.K21 is a knowledge element in the Communication and Navigation Systems subject of the A&P Airframe test. A knowledge element is something the FAA expects you to know, and the written test asks questions on it.
- AM
- Aviation Mechanic, the mechanic test standard
- II
- Section II: Airframe
- I
- Subject: Communication and Navigation Systems
- K21
- Knowledge element 21
Seeing it on your score report
Your Airman Knowledge Test Report lists an ACS code for each question you missed. Seeing AM.II.I.K21 there means at least one of your wrong answers was on this element. The examiner retests every code on your report during the oral part of the practical test, so study it before then.
Sources: Aviation Mechanic ACS Companion Guide, FAA-G-ACS-1 (Change 2), ch. 2, p. 11 and ch. 5, p. 19; FAA-S-ACS-1, Appendix 1, p. A-1.
The examiner will ask about the codes you missed
"All deficient knowledge areas, as indicated by the ACS codes on the AKTRs, are retested during the oral portion of the test."
Your oral test is 4 random questions plus one for every code on your report, closed book. Our A&P Oral & Practical course builds a mock oral from the codes you tick, with a model answer and FAA source for every question, and a guide for every practical project. $49.
See Oral & PracticalTry a sample question on AM.II.I.K21
After replacing a transponder, you need to set a test code before running it on the ramp. Which procedure avoids an unintended transmission that ATC could take as an emergency?
Practice communication and navigation systems
The full A&P Airframe course has questions on every element in this subject area, with an explanation and FAA source for each.