Definition
An alloy of copper and tin, sometimes with small amounts of other elements such as aluminum, silicon, or phosphorus added to improve specific properties. Bronze is harder, stronger, and more corrosion-resistant than pure copper, and is used in aircraft for bushings, bearings, valve seats, and other parts that require wear resistance and dimensional stability.
Plain English
A metal made mostly of copper mixed with tin. It's tougher than copper alone and resists wear and corrosion well, which is why it's used for parts that have to slide, rub, or seal against other parts.
Context Anchor
Seen in aircraft maintenance when identifying materials for small moving-part supports, sleeves, fittings, or other parts that may rub or wear.
Derivation
From the Italian 'bronzo,' likely tracing back to the Persian 'birinj' (copper). The word has long described copper-tin alloys, which were among the first metal mixtures humans learned to make, giving the Bronze Age its name.
Why Pilots Care
Knowing that a part is bronze (rather than brass or steel) tells you something about how it behaves -- bronze bushings, for example, are chosen for their wear resistance, and using the wrong replacement material can lead to early failure.
Intuition Check
Bronze does not mean just a brownish color here. It means a specific copper-based metal used for certain aircraft parts.
Example Sentence 1
The mechanic replaced the worn bronze bushing in the landing gear pivot with a new one of the same alloy.
Example Sentence 2
Bronze fittings are preferred in fuel systems because they resist corrosion from aviation gasoline.