Where is titanium most often used on an aircraft?

• A. In the landing gear
• B. In the engine exhaust areas
• C. In the wing skins
• D. In the cabin frames

Answer: (B)

Titanium is prized in aircraft for its high strength-to-weight ratio and its excellent resistance to oxidation at elevated temperatures. In the engine exhaust areas, components endure very hot, corrosive gases, so a material that can maintain strength without rapidly oxidizing is essential while keeping weight down. Aluminum or steel components either lose strength at high temperatures or add unnecessary weight, and they don’t offer the same combination of heat tolerance and lightness that titanium provides. That makes titanium especially well-suited for hot sections like the engine exhaust areas. Other areas such as landing gear, wing skins, or cabin frames rely more on materials that are cheaper, easier to manufacture, or sufficiently strong at lower temperatures, so titanium isn’t used as extensively there.