Definition
A fine metal wire made from tungsten, a metallic element with an extremely high melting point (about 3,400°C / 6,150°F). In aviation electrical components, tungsten wire is used as the filament in incandescent lamps because it can be heated to a glowing white-hot temperature without melting, producing visible light.
Plain English
A very thin wire made of tungsten metal, used as the part inside a light bulb that glows when electricity passes through it. Tungsten is used because it can get extremely hot without melting.
Context Anchor
Seen in aircraft electrical-system and lighting discussions, especially when studying incandescent bulbs, landing lights, position lights, or instrument lights.
Derivation
Tungsten comes from the Swedish 'tung sten,' meaning 'heavy stone,' which describes the metal's high density. Knowing it is a heavy, dense metal helps explain why it also resists melting at very high temperatures, making it ideal for filaments.
Why Pilots Care
Tungsten filaments are common in older landing, taxi, position, and panel lights. They are sensitive to vibration and shock, which is a frequent cause of bulb failure in aircraft. Understanding this helps when troubleshooting why a lamp burned out and why LED replacements are increasingly preferred.
Grounding Statement
When current passes through tungsten wire in a bulb, the wire gets hot enough to glow but normally does not melt.
Intuition Check
Do not think of tungsten wire as normal copper aircraft wiring. In this context, it is usually the tiny hot wire inside a bulb that makes light, not a wire used to carry power around the airplane.
Example Sentence 1
When current flows through the tungsten wire inside the landing light, the filament heats to white-hot temperatures and produces a bright beam.
Example Sentence 2
Older cockpit instrument lights still rely on tungsten wire to produce steady illumination.