Powerplant written: 10 mistakes that cost a pass

In 2025, 63.04% of FAA Powerplant (AMP) knowledge-test attempts passed, the lowest of the three A&P written tests. These are the patterns that most often turn a study plan into a retake.

1. Memorizing answer letters instead of the reason. The FAA rewords and rotates questions. Learn why the right answer is right, using the handbook page.
2. Studying randomly instead of by ACS area. Your test report lists missed areas by ACS code. Drill each Powerplant ACS area until you score well above 70% in it.
3. Skipping turbine engines. Many students know piston engines well from shop time and then lose points on turbine theory, air systems and reversers. See turbine engine questions.
4. Weak on ignition and magnetos. E-gap, timing and the magneto circuit are classic misses. See ignition questions.
5. Fuel metering confusion. Float carbs, pressure carbs and fuel injection get mixed up. See fuel metering questions.
6. Ignoring propellers. Props are tested on the Powerplant written, not Airframe. See propeller questions.
7. Never practicing under time. 100 questions in 2 hours is about 72 seconds per question. Take full timed mocks before test day.
8. Booking before you are consistently passing. Aim for practice scores well above 70% on fresh questions, not ones you have seen many times.
9. Not reading every option. Each question has three choices. Distractors are often "almost right."
10. Forgetting the oral. Every ACS code you miss on the written can add questions at the oral and practical, so a bare pass costs you later.

Source: FAA Airman Knowledge Test Statistics, faa.gov (CY2025_AKT_Volume_Report.pdf, 2024_akt_volume_report.pdf, annual_statistics_2023.pdf). Figures count test events, so retakes are included.

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