Federal Aviation Regulations
Sec. 23.1381 — Instrument lights.
The instrument lights must—(a) Make each instrument and control easily readable and discernible;
(b) Be installed so that their direct rays, and rays reflected from the windshield or other surface, are shielded from the pilot's eyes; and
(c) Have enough distance or insulating material between current carrying parts and the housing so that vibration in flight will not cause shorting.
A cabin dome light is not an instrument light.
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