A&P Written Test Guide: How to Pass All Three

The three A&P written tests — General, Airframe, and Powerplant — are your gateway to the oral and practical exams with a DME. They're not the hardest tests you'll ever take, but underestimating them is a mistake. Every year, students fail because they didn't take the written exams seriously.

Here's how to pass all three efficiently.

Overview of the Three Tests

All three tests are taken at PSI testing centers. You can schedule online at psiexams.com. Tests are computer-based.

What Each Test Covers

General Test (60 Questions)

This test covers knowledge that applies to both airframe and powerplant mechanics:

• Mathematics: Basic arithmetic, algebra, geometry
• Physics: Principles of flight, fluid mechanics, electricity basics
• FAA Regulations: Part 43 (maintenance regulations), Part 65 (mechanic certification), Part 91 (general operating rules)
• Publications: How to use ADs (Airworthiness Directives), Service Bulletins, Type Certificate Data Sheets (TCDS), and Supplemental Type Certificates (STC)
• Inspection Procedures: 100-hour and annual inspection requirements
• Materials and Processes: Aircraft hardware (bolts, nuts, rivets), safety wiring, corrosion control
• Ground Operations and Safety: Hangaring, taxiing, fire safety, FOD prevention
• Weight and Balance: Calculations, datum, arm, moment, CG range

Airframe Test (100 Questions)

• Structures: Wood, fabric, sheet metal, composite construction and repair
• Assembly and Rigging: Flight controls, cable tension, rigging procedures
• Fabric Covering: Doping, rib stitching, coating
• Sheet Metal: Layout, forming, riveting, inspection
• Hydraulics: Principles, components, fluid types, troubleshooting
• Pneumatics and Pressurization: System components, controllers, regulators
• Landing Gear: Types, braking systems, anti-skid, inspection
• Electrical Systems: Wiring, switches, circuit breakers, generators, alternators
• Fuel Systems: Tanks, pumps, filters, fuel management
• Position and Warning Systems: Stall warning, gear position, fire detection
• Ice and Rain Protection: De-icing, anti-icing, heating systems
• Cabin Atmosphere: Heating, cooling, oxygen systems

Powerplant Test (100 Questions)

• Reciprocating Engines: Theory of operation, overhaul, troubleshooting, magnetos, carburetors
• Turbine Engines: Theory, types (turbojet, turbofan, turboprop, turboshaft), components, maintenance
• Engine Inspection and Maintenance: Borescope, oil analysis, compression testing
• Ignition Systems: Magnetos (reciprocating), igniters (turbine)
• Fuel Metering Systems: Carburetors, fuel injection, FADEC, FCUs
• Induction and Exhaust Systems: Turbochargers, superchargers, exhaust components
• Engine Cooling Systems: Air cooling, liquid cooling
• Engine Lubrication Systems: Wet sump, dry sump, oil types
• Propellers: Fixed pitch, constant speed, governors, inspection
• Engine Starting Systems: Starters, APU, air start systems
• Engine Fire Protection: Detection, extinguishing, overheat systems

Study Resources

Study Strategy

The Proven Approach:

Study Timeline

If you're studying while attending a Part 147 school, you'll cover this material throughout the program and may need less isolated study time.

Test Day Tips

1. Arrive early. PSI testing centers are strict about timing.
2. Bring two forms of ID — one must be government-issued with a photo.
3. You can't bring notes, phones, or reference materials into the testing area.
4. Use the on-screen calculator for weight and balance problems.
5. Flag uncertain questions and come back to them. Don't waste time on a single question.
6. The 70% passing score is generous — but aim for 80%+ so you have margin.
7. You can retake a failed test after 30 days — but try to pass the first time.

Common Mistakes

• ❌ Skipping the General test and going straight to Airframe/Powerplant — the General covers concepts that appear in the other two.
• ❌ Only studying the question bank without understanding the concepts — you'll get tripped up by differently worded questions.
• ❌ Waiting too long between tests — study and test all three within a month if possible.
• ❌ Not studying regulations — Part 43 and Part 65 questions are easy points if you know them, and traps if you don't.
• ❌ Ignoring weight and balance — it shows up on all three tests and is guaranteed points if you know the math.

After Passing the Written Tests

Your written test results are valid for 24 months. Within that window, you need to schedule and complete your oral and practical exams with a DME. Don't let your written results expire — retaking them is a waste of time and money.

🔗 Once you pass, find A&P jobs immediately. Browse jobs on MyAviJobs →

🔗 See what newly certified A&P mechanics earn. Salary Explorer →