Over the past few years, I have had a website (www.FAATestCodeLookup.com) running that helps people look up the knowledge test codes that are generated on FAA knowledge tests. This past week, I finally looked at the report data in searches people have been doing on the site.

I found that I had a lot more data than I realized, so with some belief in the statistical validity of what it was showing, I compiled some data to share out with the world.

First, I found that I had 1817 report requests for the Aircaraft Mechanic test and found the following were the top 10 knowledge test codes that show up on mechanic tests.

The next chart shows exactly what percentage of the test reports those particular codes show up on as a “missed question” subject area, and the specific ACS code description associated with those codes.

If you are taking an aircraft mechanic test anytime soon, these subject areas might just be worth a little more study time if you want to increase your test scores compared to everyone else!

Data source for these data points compiled from data collected on: