Also known as: fil.
FIL has various meanings in the Aviation category. Discover the full forms, definitions, and usage contexts of FIL in Aviation.
The coil that is present inside a bulb which leads to illumination when current is passed through it. A thin thread. A wire of high melting point heated by the passage of current inside a vacuum tube, incandescent lamp or other similar device. 1) Fiber characterized by extreme length. 2) The resistance wire through which filament current is sent in a thermionic tube to produce the heat required for electron emissions.
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