Materials and Processes Flashcards
Aircraft structures are built from specific materials selected for their strength-to-weight ratios, fatigue resistance, and corrosion properties. Understanding how these materials are processed — heat treated, formed, joined, and inspected — is essential for performing repairs that maintain structural integrity.
The FAA General exam covers material identification (alloy temper designations), heat treatment processes, non-destructive testing (NDT) methods, and the characteristics of common aircraft materials. These flashcards focus on the material science concepts the exam tests most frequently.
What You Need to Know
- Aluminum alloy designations: 2024-T3, 6061-T6, 7075-T6
- The letter "T" followed by a number indicates temper (heat treatment)
- Solution heat treatment: heating then quenching to dissolve alloying elements
- Precipitation hardening (aging): reheating to allow alloying elements to precipitate
- Steel classification: SAE/AISI numbers (e.g., 4130 = chromium-molybdenum steel)
- NDT methods: dye penetrant, eddy current, ultrasonic, magnetic particle, radiographic
- Dye penetrant: detects surface cracks; magnetic particle: ferromagnetic materials only
- Rivet identification: AN470 (universal head), AN426 (countersunk)
Why This Topic Appears on FAA Exams
Material science is tested because using the wrong material or heat treatment in a repair can cause premature failure. A 6061-T6 repair patch on a 2024-T3 structure, for example, would have different properties and might not perform equivalently. The exam verifies you understand material designations, NDT selection, and heat treatment basics.
Sample Flashcards
Tap any card to reveal the answer. These are just a sample — the full deck is available inside the study platform.
What does the "T" designation mean in aluminum alloy 2024-T3?
What is the most commonly used structural aluminum alloy in aircraft?
What NDT method is used to detect surface cracks in non-magnetic materials?
What is the difference between solution heat treatment and precipitation hardening?
Study Tips
Memorize common alloy designations: 2024-T3 is the most common structural aluminum, 6061-T6 is used for general purposes, and 7075-T6 is high-strength. For NDT, learn which method detects which type of defect: dye penetrant for surface cracks, ultrasonic and radiographic for internal defects, magnetic particle for ferromagnetic surface and near-surface defects.
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Frequently Asked Questions
2024-T3 has higher strength and is used for primary structures (skin, stringers). 6061-T6 is lower strength but has better corrosion resistance and weldability, making it suitable for secondary structures and non-structural applications.
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