29.1322—Warning, caution, and advisory lights.
If warning, caution or advisory lights are installed in the cockpit they must, unless otherwise approved by the Administrator, be—
(a)
Red, for warning lights (lights indicating a hazard which may require immediate corrective action);
(d)
Any other color, including white, for lights not described in paragraphs (a) through (c) of this section, provided the color differs sufficiently from the colors prescribed in paragraphs (a) through (c) of this section to avoid possible confusion.