What Makes the A&P Written Tests So Challenging?

The A&P written tests are not like typical classroom exams. Each one demands precise recall of technical facts, exact regulatory requirements, and the ability to apply complex knowledge to real-world maintenance scenarios. The General test (AMG) covers the foundations: regulations, mathematics, physics, basic electricity, aircraft drawings, weight & balance, materials and processes, and maintenance practices. The Airframe test (AMA) covers structures and airframe systems — sheet metal, composites, welding, landing gear, flight controls, hydraulics, fuel systems, and cabin environment. The Powerplant test (AMP) covers reciprocating and turbine engines, propellers, fuel metering, ignition, lubrication, and engine systems.

Administered at PSI testing centers under the FAA knowledge testing program, the tests consist of 60 questions (General) or 100 questions (Airframe and Powerplant) with a 2-hour time limit each. To pass, you must score at least 70% — meaning no more than 18 wrong answers on the General test and no more than 30 wrong answers on the Airframe or Powerplant tests. Questions are drawn from large question banks, so no two exams are identical.

What makes these tests particularly difficult is the level of detail required. You are expected to know specific section numbers (such as §43.9 for maintenance records), regulatory time limits (such as the 12-month annual inspection interval under §91.409), and the precise conditions under which an aircraft can be returned to service. This is not a test of general aviation knowledge — it is a test of technical and regulatory precision.

Pass Rates: What the Data Shows

The FAA does not publish official pass rates for the individual A&P knowledge tests. However, feedback from Part 147 schools, testing centers, and industry training providers consistently suggests that first-attempt pass rates for the General test land in the 65–75% range, with the Airframe and Powerplant tests somewhat higher — often reported in the 75–85% range — because candidates encounter that material more regularly in their practical training.

The General test's regulations portion is the most common source of failures. Regulatory questions are abstract and text-heavy, requiring dedicated memorization and application practice. By contrast, candidates who have worked in a hangar or completed hands-on training tend to find the Airframe and Powerplant technical questions more intuitive.

It is important to note that these figures are estimates based on industry sources rather than official FAA statistics. However, the consistent pattern across multiple data points confirms that the written tests deserve serious, structured study — and that the oral and practical portion with a Designated Mechanic Examiner (DME) is where candidates are most likely to be retested.

The 70% Pass Mark: Why It Matters

The 70% pass mark applies to all three A&P knowledge tests. On the General test, that means at least 42 correct answers out of 60. On the Airframe and Powerplant tests, at least 70 correct answers out of 100. While 70% may sound achievable, the reality is that each question has multiple answer choices, and the distractors are carefully designed to test nuanced understanding rather than surface-level recall.

Common question formats include:

Direct regulatory recall — "Under §43.9, which of the following must be included in every maintenance record entry?"
Scenario-based application — "An aircraft undergoes a 100-hour inspection. The mechanic discovers a crack in a wing spar. What repair classification and documentation apply under Part 43?"
Technical calculation — "What is the total voltage drop in a circuit with... ?" (weight & balance, electrical, and physics problems appear regularly)
Definition questions — "According to 14 CFR Part 1, what is the definition of a 'major alteration'?"

The challenge is that many answer choices are technically correct in a general sense but inaccurate according to the specific regulation or FAA reference. This requires you to know the material well enough to distinguish between nearly identical statements — a skill that only develops through repeated practice with real exam-style questions.

Retaking a Failed Test: The Stakes

If you fail an A&P knowledge test, you can retake it — there is no limit on the number of attempts. Each attempt requires a new registration and test fee at the PSI testing center. The practical impact is significant: a failed test means a return trip to the testing center, additional fees, and a delay in your certification timeline. For apprentices close to completing their experience requirements, a failed written test can push back the oral and practical exam — and the raise that comes with a mechanic certificate.

This is why thorough preparation is not just recommended — it is essential. Treating the written tests as something you will "give a try and see how it goes" is a strategy that costs many candidates time and money. The best approach is to prepare until you are consistently scoring 80% or higher on practice exams before booking your official test date. Your PSI test results report shows your performance by subject area, so even a failed attempt gives you a precise map of what to study before retaking.

Proven Study Strategies for the A&P Written Tests

Based on feedback from hundreds of successful A&P candidates, the following strategies consistently produce the best results:

1. Study the Aviation Mechanic ACS — Not Random Question Banks

The FAA's Aviation Mechanic Airman Certification Standards (ACS) is the authoritative document that defines every subject area and task tested on the knowledge exams and the oral/practical test. Many candidates make the mistake of drilling random question banks without understanding the underlying structure. Use the ACS as your roadmap: for each task in AM.I (General), AM.II (Airframe), and AM.III (Powerplant), work through the associated knowledge elements until you can explain them from memory.

Focus especially on the regulations subject area (14 CFR Parts 1, 39, 43, 65, 91) and the maintenance practices covered by AC 43.13-1B. Pay special attention to sections that contain numbers, dates, or conditional language ("may," "shall," "must").

2. Use Active Recall with Practice Questions

Passive reading is one of the least effective study methods for technical and regulatory exams. Active recall — testing yourself repeatedly on the material — has been shown by cognitive science research to dramatically improve long-term retention. This is especially important for the A&P tests, where the ability to recall specific facts and references under time pressure is critical.

Platforms like Sky License use adaptive algorithms that generate practice questions calibrated to the ACS, track your performance across every subject area, and automatically focus on your weakest areas. This targeted approach is far more efficient than working through a static question bank in order.

3. Create a Reference Sheet for Regulations and Formulas

Build a personal reference document organized by subject: for each regulation section, write down the key requirement in plain English and the exact reference number; for each technical area, list the formulas and values you must memorize (Ohm's law, weight & balance equations, load factors, inspection intervals). The act of writing this document — even if you rarely look at it again — forces your brain to process and organize the information in a way that passive reading does not.

4. Simulate Exam Conditions

Before your official test, take at least three full-length practice tests under timed conditions (60 questions for General, 100 for Airframe and Powerplant, 2 hours each). Sit in a quiet room, eliminate all distractions, and do not pause or look up answers during the test. This builds the mental stamina and time-management skills you will need on exam day. Review every incorrect answer in detail afterward — understanding why you got a question wrong is more valuable than getting it right by luck.

5. Allocate at Least 4–6 Weeks of Dedicated Study Per Test

The A&P written tests are not something you can cram for in a weekend. Most successful candidates report studying 4 to 6 weeks per test, dedicating 5–10 hours per week to subject-specific review. Spread your study sessions across multiple days rather than doing marathon sessions — spaced repetition is scientifically proven to improve retention for technical material.

How Sky License Prepares You for the A&P Written Tests

Sky License was built specifically to address the unique challenges of the FAA knowledge exams. Our platform offers:

ACS-aligned question banks — Hundreds of exam-style questions organized by subject area, directly mapped to the Aviation Mechanic ACS.
Adaptive difficulty — The AI identifies your weak areas and generates more questions in those domains until you reach mastery.
Detailed explanations — Every question includes a full explanation with the exact 14 CFR or FAA handbook reference, so you learn the rule behind the answer.
Timed practice exams — Full-length simulations that replicate the real PSI testing environment, complete with the 2-hour timer.
Progress analytics — Track your scores by subject area and see exactly which sections need more work before test day.

Start preparing with Sky License →