Airframe Written Test FAQ: FAA A&P Questions Answered
The Airframe knowledge test is one of the three written tests required for the FAA Airframe & Powerplant (A&P) mechanic certificate. It covers everything from structural materials and fuselage construction to hydraulic systems, landing gear, flight controls, and environmental systems. This FAQ answers the most common questions about the test format, content, difficulty, and how to prepare effectively with SkyLicense.
SkyLicense Team
FAA A&P exam preparation specialists — helping mechanics earn their Airframe & Powerplant certificate since 2025
Overview of the FAA Airframe Written Test
The Airframe written test is one of the three FAA airman knowledge tests required for the A&P mechanic certificate under 14 CFR Part 65 Subpart D. It tests your theoretical knowledge of aircraft structures and airframe systems, covering the subject areas defined in the Airframe (AM.II) section of the Aviation Mechanic Airman Certification Standards (FAA-S-ACS-1). These subject areas span airframe structures (wood, fabric, sheet metal, and composite), aircraft landing gear systems, hydraulic and pneumatic power systems, cabin atmosphere control systems, instrument systems, communication and navigation systems, fuel systems, electrical power systems, position and warning systems, ice and rain protection, fire protection, and aircraft systems inspections.
The test ensures that every A&P applicant has a comprehensive understanding of how airframe systems work, how they are maintained, and how to diagnose and correct faults. While your practical experience develops hands-on skills, the written test verifies the theoretical foundation needed to make sound maintenance decisions. Questions range from basic component identification and function to complex integrated scenarios where a failure in one system affects the operation of another — exactly the kind of reasoning required for real-world troubleshooting.
Preparing for the Airframe written test requires a systematic approach. With a dozen subject areas, you cannot afford to study randomly. The most successful candidates organize study by system, master each system individually, and then practice with cross-system scenarios. SkyLicense supports this approach with subject-based adaptive difficulty — as you demonstrate proficiency in one area, the system progresses you to harder questions while mixing in questions from previously mastered subjects to reinforce retention. This spiral learning approach keeps material fresh throughout your study period.
Key Airframe Subject Areas to Master
Certain AM.II subject areas receive more emphasis on the FAA test. Hydraulic and pneumatic power systems are consistently among the most heavily tested topics, followed by landing gear systems and aircraft structures. Flight controls and rigging, fuel systems, and cabin atmosphere control form the next tier. Inspection requirements — including the use of AC 43.13-1B and the aircraft maintenance manual — appear across all subject areas. Allocate your study time accordingly, spending more time on high-weight topics while still covering every subject in the ACS. SkyLicense performance analytics show your accuracy by subject so you can see where you stand relative to the test requirements.
Frequently Asked Questions
What is the FAA Airframe written test and what does it cover?
The Airframe written test is one of the three FAA airman knowledge tests required for the Airframe & Powerplant (A&P) mechanic certificate, alongside the General and Powerplant tests. It evaluates your knowledge of aircraft structures and airframe systems as defined in the Airframe (AM.II) section of the FAA Aviation Mechanic General, Airframe, and Powerplant Airman Certification Standards (ACS, FAA-S-ACS-1). Test items cover airframe structures — wood, fabric, sheet metal, and composites — plus landing gear, hydraulic and pneumatic power systems, cabin atmosphere control, instrument systems, communication and navigation systems, fuel systems, electrical power systems, position and warning systems, ice and rain protection, and fire protection. SkyLicense aligns its Airframe question bank to the AM.II subject areas of the ACS so you study exactly what the FAA tests.
How many questions are on the Airframe written test and how much time do I get?
The FAA Airframe knowledge test consists of 100 multiple-choice questions with a 2-hour time limit. The minimum passing score is 70 percent, meaning you must answer at least 70 questions correctly. The test is computer-based and administered by PSI at FAA-authorized computer testing centers across the United States. Questions range from basic component identification and system function to troubleshooting scenarios that require integrating knowledge across multiple airframe systems. SkyLicense offers timed mock exams that replicate the exact 100-question, 2-hour format so you can build both speed and accuracy before test day.
What are the most important topics to study for the Airframe written test?
Based on the AM.II section of the Aviation Mechanic ACS, the highest-weight airframe subject areas are: aircraft structures — sheet metal repair, riveting, corrosion control, and composite materials; landing gear systems including shock struts, retraction mechanisms, wheels, brakes, and anti-skid; hydraulic and pneumatic power systems with pumps, actuators, valves, accumulators, and fluids; flight controls and rigging; cabin atmosphere control and pressurization; aircraft fuel systems; and ice and rain protection. System inspection requirements per 14 CFR Part 43 and AC 43.13-1B also appear throughout the test. SkyLicense performance analytics show your accuracy by ACS subject area so you can see exactly where you stand.
Is the Airframe written test harder than the Powerplant written test?
Opinions vary among mechanics, but many find the Airframe test slightly more challenging because it spans a broader range of systems. The Airframe test draws from roughly a dozen AM.II subject areas covering everything from structural materials to complex hydraulic and environmental systems, while the Powerplant test focuses more narrowly on engines and their supporting systems. However, if you have strong hands-on experience with airframe systems, you may find the Airframe test more intuitive. Both tests are required for the A&P certificate, so a balanced study plan is essential. SkyLicense tracks your accuracy across each ACS subject area so you can identify and fix weak spots before exam day.
Do I need to know specific aircraft types for the Airframe written test?
The Airframe knowledge test evaluates general airframe knowledge that applies across aircraft types, not model-specific details. You will not be asked about the landing gear configuration of a Boeing 737 versus an Airbus A320. Instead, the test covers airframe principles that apply broadly: how hydraulic systems work, what materials are used for different structural components, the principles of flight control actuation, and inspection criteria per 14 CFR Part 43 and AC 43.13-1B. You should, however, be familiar with representative examples from general aviation, transport-category, and rotorcraft to answer scenario-based questions. SkyLicense questions use these representative examples to help you connect principles to real aircraft.
What types of hydraulic systems are covered on the Airframe written test?
Hydraulic power systems are one of the most heavily tested airframe topics. You need to understand basic hydraulic principles (Pascal law, pressure, flow, force multiplication), hydraulic fluid types (mineral-based, phosphate ester such as Skydrol, and their compatibility), system components — pumps (gear, vane, piston), actuators, selector valves, pressure relief valves, check valves, sequence valves, accumulators, filters, and reservoirs — and system operation including power-up, pressure regulation, and emergency systems. You should also know how to identify fluid contamination, proper handling procedures, and the dangers of mixing incompatible fluids. SkyLicense includes a dedicated hydraulics module with progressive difficulty aligned to the ACS.
How much structural metallurgy do I need to know for the Airframe written test?
The Airframe test requires a solid understanding of aircraft structural materials and their properties. You should know the common aluminum alloys used in airframe construction (2024, 6061, 7075) and their characteristics — strength, corrosion resistance, and typical applications. You should understand heat treatment processes (solution heat treatment, precipitation hardening, annealing) and how they affect material properties. Steel alloys such as 4130 and 4340 and their use in landing gear and engine mounts are also tested. Composite materials — fiberglass, carbon fiber, and Kevlar — are increasingly covered as they become more common in modern aircraft. Knowledge of corrosion types (surface, pitting, intergranular, exfoliation, stress corrosion cracking) and their detection and treatment per AC 43.13-1B is essential.
What should I know about landing gear systems?
Landing gear is a major topic area on the Airframe written test. You need to understand landing gear configurations (conventional, tricycle, tandem) and fixed versus retractable arrangements. Key components include shock struts (oleo-pneumatic, spring, bungee), retraction and extension mechanisms (hydraulic, electric, and manual backup), wheel and brake assemblies (disc brakes, expander tube brakes, anti-skid systems), nose wheel steering, and landing gear position and warning systems. Tire construction, ratings, and wear limits are also tested, along with inspection criteria for landing gear components. Know the difference between servicing checks and the inspection requirements described in the aircraft maintenance manual and 14 CFR Part 43.
How are flight control systems tested on the Airframe written test?
Flight control questions test your knowledge of primary flight controls (ailerons, elevators, rudder) and secondary flight controls (flaps, slats, spoilers, trim tabs, servo tabs). You should understand actuation methods — mechanical cables, push-pull rods, hydraulic actuators, and fly-by-wire — control surface construction, balancing and rigging requirements, and the effects of control surface defects. Trim systems, including trim tabs, balance tabs, anti-servo tabs, and electric trim, are frequently tested. You should also know inspection requirements for control cables (wear limits, tension, corrosion), pulleys, and fairleads. Rigging and travel-limit checks referenced in the airframe handbook and the aircraft maintenance manual are common question sources.
What study strategy works best for the FAA Airframe written test?
The most effective strategy combines topical study with system-level integration. Start by studying each airframe system individually — hydraulics, landing gear, flight controls, structures, fuel, pneumatics, and environmental systems — using focused question sets. Once you have solid knowledge of each system, practice with integrated scenario questions that require combining knowledge across multiple systems, such as a hydraulic failure affecting landing gear extension and flight control operation. Use the FAA handbooks (FAA-H-8083-30B General and FAA-H-8083-31B Airframe) as your primary references and the ACS as your checklist. SkyLicense supports this with subject-level adaptive difficulty for initial learning and mixed-topic mock exams for integration practice.
Do I need to pass the General written test before the Airframe test?
There is no required order for the three FAA knowledge tests — General, Airframe, and Powerplant. You can take them in any sequence that suits your schedule, and each is administered independently by PSI. Many candidates take the General test first because its content — basic electricity, materials, physics, and regulations — provides a foundation for the technical tests. The FAA requires that you pass all three knowledge tests, present FAA Form 8610-2 to a Designated Mechanic Examiner or FAA office, and pass the oral and practical (O&P) exam. Knowledge test results are valid for 24 months from the test date. You also need 18 months of practical experience for a single rating or 30 months for both, per 14 CFR 65.77.
How does SkyLicense prepare me for the FAA Airframe written test?
SkyLicense offers a comprehensive Airframe module with 600+ practice questions aligned to the AM.II subject areas of the Aviation Mechanic ACS. Features include AI-powered adaptive difficulty that adjusts to your performance across each topic area, detailed answer explanations that reference the FAA handbooks and AC 43.13-1B, timed mock exams that match the real 100-question, 2-hour format, and performance analytics showing your accuracy by ACS subject. Whether you are studying structures, hydraulics, landing gear, or flight controls, SkyLicense adapts to your level and focuses you on the areas that need work. The FAA General module is free — start practicing today.
For more on the FAA A&P certification process and the other knowledge tests, check out our complete A&P written test study guide and the Powerplant written test FAQ. Visit the main SkyLicense FAQ for platform questions.
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